CPT 64721: Carpal Tunnel Release Billing, 2026 Rates, and Modifiers

CPT 64721 is the open carpal tunnel release CPT code: the surgeon frees (neuroplasty) or moves (transposition) the median nerve at the carpal tunnel through an open incision that divides the transverse carpal ligament. It’s a unilateral code. The American Medical Association (AMA) added a third release code, 64728, on January 1, 2026.

On the claim, you pick the code from the surgical approach and the modifier from the operated side. Payment depends on the setting. Medicare pays the surgeon one rate in the office and a lower one in an ambulatory surgery center (ASC) or hospital outpatient department (HOPD), where the facility bills its own fee.

Key takeawaysOpen release on one wrist: bill 64721 with RT or LT.Endoscopic release is 29848; an endoscopic case converted to open is 64721 only.Both wrists in one session: 64721-50, one unit, paid at 150% on Medicare physician claims.2026 national Medicare physician rate: $482.64 in the office, $423.19 in a facility.The 90-day global covers routine post-op visits, wound checks, and suture removal.New in 2026: 64728 for percutaneous balloon release; Anthem and Premera don’t cover it.

Last verified: Centers for Medicare & Medicaid Services (CMS) CY 2026 Physician Fee Schedule, National Correct Coding Initiative (NCCI) Policy Manual (January 1, 2026), Medicare.gov Procedure Price Lookup (2026), and FY2027 ICD-10-CM.

CPT 64721 Quick Facts for 2026

Code 64721 carries a 090 global period, a 2026 work relative value unit (RVU) of 4.85, and a national Medicare physician payment of $482.64 in the office or $423.19 in a facility. Coders check the fields below before a carpal tunnel claim goes out.

64721 quick facts, 2026

Field	Value
Description	Open release of the transverse carpal ligament to free or move the median nerve at the wrist
Procedure type	Open surgical release. Endoscopic is 29848; percutaneous with balloon dilation is 64728 (new January 1, 2026).
Global period	090: 90 days after surgery, a 92-day window counting the day before and the day of surgery
Laterality	Unilateral; append RT or LT
Conversion rule	Endoscopic converted to open: report 64721 only
Bundling	29848 on the same wrist, the surgeon’s local anesthesia, closing the incision (12001 to 13153), and supplies
Bilateral, same session	64721-50, one unit, on a Medicare physician claim (bilateral indicator 1). The ASC bills two lines.
Medically Unlikely Edit (MUE)	One unit per day, adjudication indicator 2
Multiple procedures	Indicator 2: 100% for the highest-valued code, 50% for the next
2026 RVUs	Work 4.85; total 14.45 non-facility, 12.67 facility
2026 physician payment (national)	$482.64 non-facility, $423.19 facility, at a $33.4009 conversion factor
2026 facility payment (national)	ASC $948.66; HOPD $1,995.02 under ambulatory payment classification (APC) 5431
Bilateral payment	150% of the one-side amount
Assistant at surgery	Not paid by Medicare (indicator 1)
ICD-10-CM	Carpal tunnel syndrome (CTS): G56.01 right, G56.02 left, G56.03 bilateral
Add-on	+64727, internal neurolysis with an operating microscope

What Is CPT Code 64721?

CPT code 64721 reports an open carpal tunnel release (CTR): the surgeon divides the transverse carpal ligament through an incision in the palm and frees or repositions the median nerve at the wrist. It’s a unilateral surgical code in the Nervous System section with a 90-day global period, and you bill it once per wrist.

64721 CPT Code Description in Plain Language

The AMA owns the CPT code set, and new and revised codes take effect each January 1. Our breakdown of CPT vs HCPCS codes covers who maintains which code set. The official long descriptor reads:

“Neuroplasty and/or transposition; median nerve at carpal tunnel.” CPT copyright American Medical Association.

Read in plain words, the CPT code 64721 description has three parts:

• Neuroplasty: release of the nerve from tissue pressing on it, with external neurolysis included
• Transposition: relocation of the nerve to a new position
• At carpal tunnel: the site, meaning the median nerve under the transverse carpal ligament on the palm side

CMS fee schedule files list 64721 under the short descriptor “Carpal tunnel surgery.” Billing staff picked up that label, so you’ll hear 64721 called the carpal tunnel surgery CPT code.

Is CPT 64721 a Wrist Procedure?

Yes. The median nerve and nine flexor tendons run through the carpal tunnel, and the transverse carpal ligament forms its roof. If a coding exam asks you to code decompression of the median nerve at the wrist, palm side, the answer is 64721. Ulnar nerve releases have two codes of their own:

• Ulnar nerve at the wrist (Guyon’s canal): 64719
• Ulnar nerve at the elbow (cubital tunnel): 64718

Who Bills 64721, and Is It a Pain Management Code?

No, 64721 isn’t a pain management code. Hand surgeons, orthopedic surgeons, plastic surgeons, and neurosurgeons bill it. Pain management physicians bill the injection side of carpal tunnel care, such as 20526 for a therapeutic injection into the carpal tunnel.

Your practice’s carpal tunnel CPT code depends on the service. You report 20526 for an injection in the clinic and 64721 for the open release in surgery. Surgical claims carry global periods and bilateral rules on top of that, the kind of work our orthopedic medical billing team handles.

Where 64721 Sits Among Nerve Decompression Codes

The 64721 CPT code belongs to a family of nerve decompression codes. Each one names a nerve and a site, so you code from the anatomy in the op note:

Nerve decompression codes related to 64721

Code	Scope in plain language	Site
64704	Neuroplasty of a nerve of the hand or foot	Hand or foot
64708	Open neuroplasty of another major arm or leg nerve	Arm or leg
64718	Release or transposition of the ulnar nerve	Elbow (cubital tunnel)
64719	Release or transposition of the ulnar nerve	Wrist (Guyon’s canal)
64721	Open release or transposition of the median nerve	Wrist (carpal tunnel)
64722	Decompression of an unspecified nerve	Varies
+64727	Internal neurolysis with an operating microscope (add-on)	Added to a neuroplasty code
64728	Percutaneous median nerve decompression with balloon dilation and ultrasound guidance (new in 2026)	Wrist (carpal tunnel)

What Is Included in a CPT 64721 Procedure?

Payment for 64721 covers the whole open release: the incision, exposure and division of the transverse carpal ligament, external neurolysis of the median nerve, and closure. Medicare also counts the surgeon’s local anesthesia, surgical supplies, and routine post-op care through day 90 as part of the surgical package.

Surgical Steps the 64721 Operative Report Should Show

The operative report is the receipt behind the claim, so these six lines need to be in it:

1. Anesthesia: the type, and who gave it
2. Incision: its location and length over the carpal tunnel
3. Exposure: the opened palmar fascia and the ligament in view
4. Release: the ligament divided along its full length under direct vision
5. Nerve: the median nerve decompressed and protected, with any transposition named
6. Closure: the skin closure and dressing

Two of those lines carry the most weight. You’ll use the anesthesia line to decide whether anyone bills anesthesia on a separate claim. The incision line proves the open approach that separates 64721 from endoscopic release, and if an endoscope went in at any point, the note should say when and why.

Services You Can’t Add to a 64721 Claim

Each item below has a written rule behind it:

• Endoscopic release on the same wrist (29848): included in 64721 under NCCI Chapter VIII, Section C.13
• Local anesthetic injection before the release (20550): CMS calls this a misuse of 20550 and uses carpal tunnel release as its example in the 2026 Medicaid NCCI correspondence manual (effective February 28, 2026)
• Anesthesia the surgeon gives, including a wrist or digital block: part of the procedure under NCCI Chapter I, and the procedure-to-procedure (PTP) edit for 01810 allows no modifier
• Closing the incision (12001 to 13153): the NCCI Policy Manual, Chapter III bars repair codes for procedures with a 90-day global period
• External neurolysis: part of neuroplasty under the CPT note below +64727
• Operating microscope (69990): CMS pays it with a short list of code ranges that leaves out 64721 (NCCI Chapter VIII, Section F.1), and its PTP edit allows no modifier
• Supplies and dressings: part of the procedure under NCCI Chapter I

Adding a repair code for the release incision is a habit worth breaking. For wound repairs that do bill on their own, see our notes on CPT 12001 repair rules.

Coding this case looks easy, and surgeons still disagree on it. In a 2021 hand surgery coding study published in the Journal of Hand Surgery Global Online, 421 American Society for Surgery of the Hand members coded an open carpal tunnel release. All of them included 64721, but 15.4% of responses added codes that three independent coders left off.

Some surgeons in that survey added 01810 for their own local anesthesia or 69990 for a microscope. The authors note that NCCI doesn’t allow payment for either code, so those extra lines come back as denials on a real claim.

Carpal Tunnel Release CPT Codes: 64721 vs 29848 vs 64728

The CPT code for carpal tunnel release depends on the approach in the operative report: 64721 for an open release, 29848 for an endoscopic release, and 64728, new on January 1, 2026, for a percutaneous release with balloon dilation and ultrasound guidance. Code from the op note, since a case booked as endoscopic can finish open.

CPT code carpal tunnel release comparison, 2026

64721	29848	64728
Approach	Open incision, direct view	Wrist endoscope	Percutaneous, with balloon dilation and ultrasound guidance
The op note must show	Open incision, ligament divided under direct vision, side	Endoscope used to divide the ligament, portals, side	Ultrasound guidance and balloon dilation, side
Global period	090	090	000
2026 work RVU	4.85	6.23	2.70
2026 Medicare surgeon fee, office	$482.64	$485.65	$1,343.05
2026 Medicare surgeon fee, facility	$423.19	$485.65	$122.58
2026 ASC facility fee	$948.66	$872.87	$1,201.96
2026 HOPD facility fee	$1,995.02	$1,642.82	$1,995.02
Commercial coverage	Covered with medical necessity	Covered with medical necessity	Anthem: not medically necessary. Premera: investigational.

Source: CMS Physician Fee Schedule (2026 national amounts, July 2026 data), July 2026 ASC Addendum AA, and July 2026 OPPS Addendum B.

Run the CPT carpal tunnel release decision through these steps, and stop at the first match:

1. Percutaneous device with balloon dilation under ultrasound? Report 64728.
2. Ligament divided under endoscopic view from start to finish? Report 29848, the CPT for endoscopic carpal tunnel release.
3. Endoscopic start with an open finish? Report 64721 alone.
4. Open incision with direct view? Report 64721, the CPT code for open carpal tunnel release.
5. Thread or needle release with no balloon? Anthem maps it to unlisted code 25999 or 64999 and won’t cover it.

[Image placeholder: Decision chart showing the five steps above. Alt text: “Release carpal tunnel CPT code decision chart: 64721, 29848, 64728”]

What Is the Difference Between CPT 64721 and 29848?

The approach is the difference. Paraphrased, the 29848 CPT code description reads as a surgical wrist endoscopy that releases the transverse carpal ligament, which makes 29848 the endoscopic carpal tunnel release CPT code. 64721 does the same release through an open incision.

CPT 29848 carries the higher work RVU in 2026 at 6.23, against 4.85 for the open release. In a facility, that puts the endoscopic surgeon fee about $62 ahead: $485.65 for 29848 and $423.19 for 64721. Pages that say the open release carries more work value have it backward for 2026.

Same wrist, same encounter: don’t bill both. Under the NCCI Policy Manual, Chapter VIII, 64721 includes 29848, and the PTP edit lists 64721 as column 1 and 29848 as column 2. The edit carries modifier indicator 1, so a documented separate site lets you bypass it.

Medicare pays both codes when the surgeon works on different wrists in one session. You’d bill 64721-RT and 29848-LT, because NCCI Chapter I recognizes RT and LT for procedures on different sites. CPT code 29848 needs a side modifier on its own claims too, since it’s a unilateral code that takes RT, LT, or 50.

Endoscopic Converted to Open: Report 64721 Only

NCCI Chapter VIII, Section C.13 (revised January 1, 2026) states: “If an endoscopic procedure is converted to an open procedure, only the open procedure may be reported.” The failed scope attempt gets no code and no distinct-procedure modifier.

On a converted case, the carpal tunnel release CPT code is 64721, whatever the surgery schedule said. The CTR CPT code follows the technique that finished the release. A surgeon who divides the ligament through an open incision and slides a scope in afterward to look has still done an open release.

Modifier 22 fits a conversion if the note shows far more work than a typical open release, such as added time, dense scar, or a longer dissection, compared against a normal case. Most payers review 22 claims by hand, so attach the op note and a line comparing the time to a routine case.

CPT 64728: The 2026 Percutaneous Carpal Tunnel Code

Code 64728 is the newest carpal tunnel code, effective January 1, 2026. The 64728 CPT code description, paraphrased, is percutaneous decompression of the median nerve at the carpal tunnel, with balloon dilation inside the tunnel and ultrasound guidance included. CMS gives it a 0-day global period, and the American Society of Plastic Surgeons (ASPS) reports the same.

In the office, 64728 pays $1,343.05 because its non-facility practice expense RVU is 37.27, against 0.73 in a facility, where the surgeon gets $122.58. Facilities collect $1,201.96 in an ASC, a device-intensive rate, and $1,995.02 in an HOPD.

Commercial plans treat it as a different CPT for carpal tunnel release with its own coverage rules. Anthem’s guideline CG-SURG-112 lists 64728 as not medically necessary. Premera policy 7.01.595 (effective July 1, 2026) lists ultrasound-guided percutaneous intracarpal tunnel balloon dilation release as investigational.

Check the patient’s plan and get written authorization before anyone books 64728. Our insurance eligibility verification team runs that check before the patient reaches the exam room.

Does CPT 64721 Need a Modifier? RT, LT, and Bilateral Rules

CPT 64721 needs a side modifier on almost every claim because it’s a unilateral code: RT for the right wrist and LT for the left. Both wrists in one session take modifier 50 with one unit on Medicare physician claims. Modifiers such as 22, 51, 58, 59, and 79 apply when the case calls for them.

Claim lines for 64721 by side and setting

Scenario	Physician claim	ASC facility claim	ICD-10-CM
Right wrist	64721-RT	64721-RT	G56.01
Left wrist	64721-LT	64721-LT	G56.02
Both wrists, same session	64721-50, one unit (Medicare); some commercial plans want RT and LT lines	64721-RT and 64721-LT, one unit each	G56.03
First side of a planned staged bilateral case	64721-RT	64721-RT	G56.03
Second side, inside the first side’s global period	64721-58-LT if planned; 64721-79-LT if not	64721-LT	G56.02
Left endoscopic release	29848-LT	29848-LT	G56.02

Right and Left Open Carpal Tunnel Release CPT Code Examples

On a right-side claim, the CPT code for right carpal tunnel release is 64721-RT; on a left-side claim, the CPT code for left carpal tunnel release is 64721-LT. The right carpal tunnel release CPT code and the left carpal tunnel release CPT code are one number, and the modifier alone tells the payer which wrist you treated.

For an open case on the right, the right open carpal tunnel release CPT code line reads 64721-RT with G56.01. A left endoscopic carpal tunnel release CPT code line reads 29848-LT with G56.02. Keep the side identical in four places: the op note header, the procedure narrative, the modifier, and the ICD-10 code for carpal tunnel release.

Billing Bilateral Carpal Tunnel Release on the Same Date

Medicare physician claims get one line, modifier 50, and one unit. The NCCI Policy Manual, Chapter I states: “If the bilateral surgery indicator is ‘1,’ a bilateral surgical procedure must be reported with ‘1’ unit of service and modifier 50.” 64721 carries that indicator.

CMS enforces it through the MUE. 64721 allows one unit per day with MUE adjudication indicator (MAI) 2, so two units on one line, or RT and LT on two lines, fail the edit on a Medicare physician claim. Chapter I, Section V says your Medicare Administrative Contractor (MAC) can’t override an MAI 2 edit on reopening or redetermination.

Put the charge for both wrists on the modifier 50 line. Medicare pays the lower of your total charge or 150% of the one-side fee schedule amount, so a one-side charge leaves money on the table. On the CMS-1500, Box 24G (units) reads 1; getting it wrong is one of the common CMS-1500 form mistakes on bilateral cases.

ASCs follow a different rule. The Medicare Claims Processing Manual, Chapter 14 has ASCs report a bilateral procedure “as two procedures, either as a single unit on two separate lines or with ‘2’ in the units field on one claim line.” First Coast, a Medicare contractor, rejects ASC claims billed with modifier 50.

Commercial plans vary. Some reject modifier 50 and want RT and LT lines, so check each payer’s bilateral policy before the claim drops. At ClaimMax RCM, coders match the side in the op note header, the narrative, the modifier, and the ICD-10 code before a hand surgery claim goes out.

Staged Bilateral Release Inside the 90-Day Global

In a staged case, the surgeon does the second wrist weeks after the first. Inside the 90 days, the modifier depends on the chart: 58 if the surgeon documented the staged plan at or before the first surgery, and 79 if the surgeon didn’t plan it. The CMS Global Surgery Booklet says a new post-op period starts with either one.

Your diagnosis coding changes too. Under Section I.B.13 of the FY2027 ICD-10-CM Official Guidelines, you report the bilateral code, G56.03, for the first side. For the second side, once the first side no longer has the condition, you switch to the one-sided code for the wrist still affected, G56.02 or G56.01.

If bilateral and staged releases keep coming back as duplicates or global-period denials, our orthopedic billing team can walk through your recent hand surgery claims with you and show which rule tripped each one.

CPT 64721 Global Period: 90-Day Rules and Surgical Modifiers

The 64721 CPT code global period is 90 days, listed as 090 global days in the Medicare fee schedule. Medicare’s package covers the pre-op visit on the day before or the day of surgery, the release itself, and routine post-op care for 90 days, a 92-day window by CMS’s count.

What the 90-Day Global Package Covers After a 64721 Release

Medicare pays these services as part of the surgical fee:

• The pre-op visit on the day before or the day of surgery, after the surgeon decides to operate
• The release and the rest of the surgeon’s work in the operating room
• Routine post-op visits, wound checks, dressing changes, and suture removal
• Post-op pain management by the surgeon
• Complications the surgeon treats without a return to the operating room (NCCI Chapter I)

The CMS Global Surgery Booklet (MLN907166, December 2025) counts the total global period as 92 days: the day before surgery, the day of surgery, and the 90 days after.

In the 2026 fee schedule, 64721 splits into 11% pre-op, 76% intra-op, and 13% post-op work. CMS uses those shares to divide payment when two surgeons split the care under modifiers 54, 55, and 56.

Services You Can Bill Outside the 64721 Global Period

A few services sit outside the package, and each one needs the right modifier or the right biller:

• Decision-for-surgery visit on the day before or day of surgery: the evaluation and management (E/M) code with modifier 57
• Unrelated visit during the 90 days: modifier 24, with a diagnosis other than carpal tunnel syndrome
• Diagnostic tests such as nerve conduction studies: outside the package, since the booklet excludes “diagnostic tests and procedures”
• Post-op hand therapy: the therapist bills it under occupational therapy CPT codes
• Transfer of care: 54 (surgery only), 55 (post-op only), and 56 (pre-op only), with a written transfer in the chart

Modifiers That Change a 64721 Claim

Surgical modifiers on 64721

Modifier	When it goes on 64721	Common mistake
22	Documented work well above a typical open release, such as a revision through scar or a conversion with a long dissection	Adding it with no time or difficulty narrative
51	Another procedure in the same session that NCCI doesn’t bundle, if the payer asks for it	Assuming Medicare needs it; Medicare ranks the procedures on its own
57	E/M on the day before or day of surgery, when the surgeon decided to operate	Using 25, which fits minor procedures
58	A planned or staged second procedure inside the global period, including a planned second wrist	Leaving it off the second side
59 or XS	A distinct procedure that an NCCI edit would bundle, backed by documentation	Using it to force the 29848 bundle through; see our modifier 59 rules
78	Unplanned return to the operating room by the same surgeon for a related complication	Billing the return trip as a new surgery with no modifier
79	An unrelated procedure during the global period, such as a trigger finger release on the other hand	Using 78 or 58 instead
80, 82, AS	Assistant at surgery	Billing Medicare, which won’t pay an assistant on 64721 (indicator 1)
47	Anesthesia by the surgeon	Billing it at all; Medicare doesn’t pay it, and the release includes local anesthesia

CPT 64721 Reimbursement: 2026 Medicare Rates by Setting

CPT 64721 pays $482.64 in a physician’s office and $423.19 in a facility, national amounts under the 2026 Medicare Physician Fee Schedule at the $33.4009 conversion factor. ASC and hospital cases add a separate facility payment: $948.66 for an ASC and $1,995.02 for a hospital outpatient department, both 2026 national rates.

Your actual 64721 CPT code reimbursement moves with your MAC locality and your payer contracts. National numbers start with these relative value units:

2026 RVUs and national payment for 64721

Component	Non-facility	Facility
Work RVU	4.85	4.85
Practice expense RVU	8.61	6.83
Malpractice RVU	0.99	0.99
Total RVUs	14.45	12.67
Payment at $33.4009	$482.64	$423.19
Payment at $33.5675 (qualifying APM participants)	$485.05	$425.30

Multiply total RVUs by the conversion factor to get the national payment. Your MAC then applies the geographic practice cost index (GPCI) for your locality, which moves the number up or down.

What Medicare pays for 64721 by setting, 2026

Setting	Place of service	Surgeon	Facility	Total	Patient pays
Office	11	$482.64	None	$482.64	20% coinsurance after the Part B deductible
ASC	24	$423	$948	$1,371	$273
Hospital outpatient	22 or 19	$423	$1,995	$2,418	$483

Source: Office row from the CMS fee schedule; ASC and hospital rows from the Medicare Procedure Price Lookup, rounded 2026 national averages.

The surgeon earns $59.45 more in the office because the practice carries the overhead there. On-campus hospital cases use place of service 22 on the surgeon’s claim, and our POS 22 billing rules cover the edge cases.

The hospital bills its own side of the case on the UB-04. That facility claim follows outpatient prospective payment rules, the work our hospital revenue cycle management team handles.

Bilateral and Multiple Procedure Payment for CPT 64721

Payment for two sides or two procedures follows set percentages:

• Bilateral, Medicare physician claim: 64721-50 pays 150%, which is $723.96 in the office and $634.78 in a facility (national, 2026)
• Bilateral, ASC: the first side pays in full and the second pays 50% under the multiple procedure discount, so $948.66 + $474.33 = $1,422.99
• Two different procedures in one session: the higher-valued code pays 100% and the next pays 50%, so list the higher-valued code first
• Hospital outpatient: status indicator J1 puts 64721 in a comprehensive APC, so one facility payment covers the visit and the UB-04 won’t show 150%

What Changed for 64721 Payment in 2026

CMS set two conversion factors for the first time: $33.4009 (up 3.26%) and $33.5675 for qualifying alternative payment model (APM) participants (up 3.77%), per the CMS 2026 fee schedule fact sheet. The final rule also cut work RVUs by 2.5% for services not billed by time.

64721 national values, 2025 vs 2026

64721, national	2025	2026	Change
Work RVU	4.97	4.85	2.5% efficiency adjustment
Practice expense RVU, facility	7.53	6.83	Lower
Practice expense RVU, non-facility	7.76	8.61	Higher
Conversion factor	$32.3465	$33.4009	Up 3.26%
Office payment	$443.79	$482.64	Up 8.8%
Facility payment	$436.35	$423.19	Down 3.0%

Facility-based surgeons took the hit. The same adjustment cut the work RVUs for 29848 (6.39 to 6.23), 64718 (7.26 to 7.08), and 64719 (4.97 to 4.85), and the 29848 facility payment fell 5.3%, from $512.69 to $485.65. CMS also added 64728 with its own prices.

Does Medicare Cover Carpal Tunnel Surgery, and What Does the Patient Pay?

Yes. Part B covers carpal tunnel release when the record supports medical necessity, and your MAC reviews the documentation if it asks for records. Medicare Advantage plans set their own copays, so an Advantage patient’s share can differ from the averages below.

Patients ask about the cost of carpal tunnel surgery before anything else, and their share depends more on the setting than on the carpal tunnel release surgery CPT code. Using Medicare.gov’s national averages, a patient pays about $273 in an ASC and $483 in a hospital outpatient department. In the office, it’s 20% of the allowed amount after the deductible.

Benchmark Commercial Rates Against Medicare

Divide your contracted allowed amount by the 2026 Medicare amount for the same setting. That percentage is the number to bring into contract talks. Pull the allowed amounts from your own 835 remittances, and check insurers’ Transparency in Coverage files, where plans publish their negotiated rates.

If a 64721-50 line keeps paying at 100% instead of 150%, our payment posting services flag it against your payer contract the day the electronic remittance advice (ERA) posts, so you catch the short payment before it ages.

Billing Other Procedures With 64721 in the Same Session

CPT 64721 can share a claim with another procedure when NCCI doesn’t bundle the pair, or when the second procedure sits on a separate site with its own documentation and the right modifier. Medicare pays the higher-valued code at 100% and the next at 50%, and pairs with modifier indicator 0 never pay.

Same-session pairs where both codes can pay (NCCI practitioner PTP edits v323r0, effective October 1, 2026)

Second code	What it is (paraphrased)	NCCI edit with 64721	How both pay	2026 national physician rate, facility
64718	Ulnar nerve release or transposition at the elbow	None	List 64718 first; 64721 drops to 50%	$575.16
26055	Trigger finger release	None	Finger modifier (FA and F1 to F9); list 64721 first	$287.58
+64727	Internal neurolysis with an operating microscope (add-on)	None	Paid in full with no multiple procedure cut; the op note must describe the microscope and the internal neurolysis	$144.96
29848	Endoscopic carpal tunnel release	64721 column 1, 29848 column 2, indicator 1	Other wrist only: 64721-RT with 29848-LT	$485.65
20526	Carpal tunnel injection	64721 column 1, 20526 column 2, indicator 1	Other wrist only: 64721-RT with 20526-LT	$49.43 (office $88.18)
64719	Ulnar nerve release at the wrist	64721 column 1, 64719 column 2, indicator 1	Separate Guyon’s canal exposure for documented ulnar nerve compression; 64719-XS	$387.78

ASCs rank the same way, since ASC Addendum AA flags 64721, 29848, 26055, 64718, and 64719 for the multiple procedure discount. A hospital outpatient claim gets one comprehensive APC payment for the whole encounter.

Pairs that don’t pay alongside 64721

Code	What it is (paraphrased)	NCCI edit	Rule
25115	Radical excision of flexor tendon sheath synovium or bursa, wrist or forearm	25115 column 1, 64721 column 2, indicator 1	Bill 25115 alone when the release is part of the same exposure
25020	Decompression fasciotomy, forearm or wrist	25020 column 1, 64721 column 2, indicator 1	Bill 25020 alone for the same exposure
25607	Open treatment with internal fixation of an extra-articular distal radius fracture	25607 column 1, 64721 column 2, indicator 1 (misuse rationale)	A release through the fracture approach isn’t separate
25111	Wrist ganglion excision	64721 column 1, 25111 column 2, indicator 1	Only a separate site with its own incision
20550	Tendon sheath injection	64721 column 1, 20550 column 2, indicator 1 (misuse rationale)	Never for the release’s own local anesthetic
64450	Peripheral nerve block	64721 column 1, 64450 column 2, indicator 1	Not when the surgeon gives it as the anesthetic
69990 and 01810	Operating microscope; anesthesia for the forearm, wrist, and hand	Indicator 0 for both	Never on the surgeon’s claim

Can CPT 64721 and 64718 Be Billed Together?

Yes. The CPT for cubital tunnel release is 64718, and the October 1, 2026 PTP file has no edit between 64718 and 64721 in either direction. List CPT 64718 first: at $575.16 (2026, national, same in office and facility), it outranks the $423.19 facility rate for 64721, so 64718 pays 100% and 64721 pays 50%, about $211.60.

Each code has an MUE of one unit per day (MAI 2) and takes its own RT or LT. Code the ulnar nerve with G56.21 or G56.22 and the median nerve with G56.01 or G56.02, matched to the side of each incision.

Can 64719 Be Billed With 64721?

Only with proof of a separate problem. The ulnar nerve decompression CPT code at the wrist is 64719, and the October 1, 2026 PTP file makes it column 2 of 64721 (modifier indicator 1, rationale “Standards of medical/surgical practice”). A routine look at the ulnar nerve through the carpal tunnel incision is part of 64721.

Bill 64719-XS when the op note shows a separate Guyon’s canal exposure for documented ulnar nerve compression, coded G56.21 or G56.22. As the Guyon’s canal release CPT code, 64719 ($387.78) ranks second behind 64721 and pays 50%, about $193.89.

Can You Code 64721 and 25115 Together?

Not through the same exposure. CPT 25115 is a radical excision of the bursa or synovium of the flexor tendon sheaths at the wrist or forearm, used for conditions such as rheumatoid tenosynovitis. The October 1, 2026 PTP file makes 25115 column 1 and 64721 column 2 (modifier indicator 1).

That direction matters: the release during the tenosynovectomy is part of 25115, so you bill 25115 alone at $703.42 (2026, national). Some answers online reverse that relationship. Codes 25020 and 25607 work the same way.

Carpal Tunnel Injection CPT 20526 and the Release

20526 is the CPT code for carpal tunnel injection. It pays $88.18 in the office and $49.43 in a facility (2026, national), carries a 0-day global, and allows one unit per day (MAI 2).

Same wrist, same day as 64721: NCCI bundles the injection under a misuse edit, so don’t bill it. For the other wrist, 64721-RT with 20526-LT pays both. An injection weeks before surgery sits outside the 90-day package, which starts the day before surgery.

NCCI Chapter I applies PTP edits to one provider’s services for a patient on one date, so a different physician’s injection doesn’t hit the surgeon’s edit. In groups where hand surgery and pain management share billing, a team that sees both specialties’ denial patterns catches these pairs, the model behind our multi-specialty clinic billing.

Anesthesia for Carpal Tunnel Release: What Type, and Who Bills It

Surgeons perform carpal tunnel release under CPT 64721 with local anesthesia such as wide awake local anesthesia no tourniquet (WALANT), a regional block, sedation, or general anesthesia. For billing, the person matters more than the type: the surgeon’s own anesthesia is part of 64721, and a separate anesthesia provider bills 01810, the anesthesia code for forearm, wrist, and hand procedures.

Match the claim to whoever gave the anesthetic:

• Surgeon, local or WALANT: no anesthesia line, and modifier 47 has nothing to attach to on a Medicare claim
• Surgeon’s own wrist block: no separate line, since 64450 is column 2 of 64721
• Anesthesia provider, sedation or general: 01810 with AA, QK, QX, QY, or QZ, plus QS for monitored anesthesia care
• Anesthesia provider’s block as the anesthetic: part of 01810, with no 64450 line

Both rules come from NCCI Chapter II. For the surgeon, it says, “Medicare does not allow separate payment for anesthesia services performed by the physician who also furnishes the medical or surgical service.”

Section B.4 handles the block: peripheral nerve block codes “shall not be reported separately on the same date of service as a surgical procedure if used as the primary anesthetic technique.” That rule reaches blocks an anesthesiologist places as the main anesthetic, too.

The anesthesia provider’s payment runs on units. 01810 carries three base units, and CMS kept anesthesia base units unchanged for CY 2026. Time units equal anesthesia minutes divided by 15, so a 30-minute case adds two time units.

At the 2026 national anesthesia conversion factor of $20.4975 ($20.5998 for qualifying APM participants), that 30-minute case works out to five units, or $102.49, before your locality adjustment. Our anesthesia CPT code rules cover the modifiers and time reporting in more depth.

ICD-10 Codes and Medical Necessity for CPT 64721

CPT 64721 claims need a carpal tunnel syndrome diagnosis coded to the operated side: G56.01 for the right wrist, G56.02 for the left, and G56.03 when both wrists have it. Payers also expect proof that testing confirmed the diagnosis and that conservative care failed, or a documented reason the surgeon skipped it.

ICD-10 code for carpal tunnel release claims

Code	Meaning	Use with
G56.00	CTS, unspecified upper limb	Avoid: the op note names a side
G56.01	CTS, right upper limb	64721-RT
G56.02	CTS, left upper limb	64721-LT
G56.03	CTS, bilateral upper limbs	64721-50, or the first side of a staged pair (Guidelines Section I.B.13)
G56.21, G56.22	Lesion of ulnar nerve, right or left	64719 or 64718 in the same session
M65.331 (M65.3 family)	Trigger finger, right middle finger	26055-F7

How Bad Does Carpal Tunnel Have to Be to Get Surgery Approved?

Each payer approves surgery when the chart meets its written criteria, and those criteria differ from one payer to the next. Two published policies show how far apart they sit:

Carpal tunnel release criteria at two payers

Criterion	Anthem CG-SURG-112 (last reviewed November 6, 2025)	Premera 7.01.595 (effective July 1, 2026)
Diagnosis	Consistent history, physical exam and/or confirmatory electrodiagnostic testing	Electrodiagnostic testing confirms CTS, or a CTS-6 score greater than 12
Conservative care	Symptoms refractory to 6 weeks of hand or wrist immobilization, or to local steroid injections	No response to at least 6 weeks of night splinting or a corticosteroid injection
When you can skip conservative care	Progressive symptoms with denervation or axonal loss confirmed by electrodiagnostic testing	Thenar wasting, impaired two-point discrimination on the thumb side, or other severe symptoms
Covered	29848, 64721	Open or endoscopic release (29848, 64721)
Not covered	64728, 25999, and 64999; thread release; ultrasound-guided needle release; internal neurolysis and other adjuncts	Thread release, ultrasound-guided needle release, and balloon dilation release, all investigational

The Anthem column comes from Anthem CG-SURG-112, last reviewed November 6, 2025. Premera’s criteria come from Premera policy 7.01.595, effective July 1, 2026.

Write the criteria into the chart in the payer’s own words. Reviewers look for the electrodiagnostic test date, the splint start date, the injection date, and any thenar wasting. A note that says “failed conservative treatment” with no dates gives a reviewer nothing to approve.

Does Medicare Require Prior Authorization for Carpal Tunnel Release?

Not in Original Medicare. The hospital outpatient prior authorization list in 42 CFR 419.83 covers blepharoplasty, botulinum toxin injections, panniculectomy, rhinoplasty, vein ablation, cervical fusion with disc removal, implanted spinal neurostimulators, and facet joint interventions. Carpal tunnel release isn’t on it, but your MAC can still review medical necessity from the record after the claim.

Medicare Advantage and commercial plans set their own authorization rules, so check at scheduling; our write-up on orthopedic prior authorization challenges covers the common traps. If the planned code changes, such as 29848 converting to 64721 or a switch to 64728, update the authorization before the claim goes out.

Workers’ compensation cases follow the carrier’s authorization and the state fee schedule instead of Medicare rules. The workup sits outside the surgical package too: nerve studies and imaging bill on their own dates, and hand films follow our CPT 73130 hand X-ray guide.

If authorizations for hand surgery keep landing after the surgery date, or your schedulers book a 64728 case before anyone reads the plan’s policy, our prior authorization support checks benefits and the plan’s authorization requirements before the patient reaches the exam room.

Documentation Checklist for 64721 Claims

A CPT 64721 claim holds up in a records request when the chart shows five things: how testing confirmed the diagnosis, the conservative care that failed, the authorization, an operative report naming the side and the open approach, and who gave anesthesia. Collect them before the claim goes out; after a denial, you’re rebuilding the file under an appeal deadline.

Before surgery, the chart needs:

• Diagnosis: the electrodiagnostic report with its date, or the CTS-6 score where the payer accepts it
• Conservative care: the splint start date and length, injection dates (20526), or the documented severity exception
• Authorization: the number, the dates, and a CPT code that matches the scheduled case
• Consent: the side and the procedure, in writing

In the operative report, look for:

• Side in the header and in the narrative
• Approach: the open incision, plus any endoscope use, with the reason and the timing
• Ligament divided along its full length, median nerve decompressed, and any transposition named
• For +64727: the operating microscope and the internal neurolysis
• For a second procedure: its own incision, site, and diagnosis
• Anesthesia: the type, and who gave it

After surgery, recovery visits and complications need their own records:

• The staged plan for the second side, dated at or before the first surgery (modifier 58)
• Complication notes that say whether a return to the operating room relates to the release (78) or doesn’t (79)
• Routine recovery visits through day 90, marked as global care, with unrelated visits carrying their own diagnosis (modifier 24)

A chart built from these records is what clean claim standards look like for a surgical case. The issue is timing: coders can only code what the op note says, so the review that catches a missing side or approach belongs in the middle of the revenue cycle.

That coding review sits between charge capture and submission in our end-to-end RCM services, which is where a missing side modifier costs the least to fix.

CPT 64721 Coding Examples

CPT code 64721 examples below show how one open release turns into different claim lines depending on the side, the setting, the timing, and what else happened in the operating room. Each row lists the codes, modifiers, and ICD-10-CM codes as they’d appear on the claim, with the rule behind them.

64721 coding examples, 2026

Scenario	Physician claim	ASC claim	Why
Right open release after eight weeks of failed night splinting, with nerve studies confirming CTS	64721-RT, G56.01	64721-RT	The side matches in the header, narrative, modifier, and diagnosis
Both wrists, same session, Medicare patient	64721-50, one unit, G56.03; pays 150%, or $634.78 in a facility	64721-RT and 64721-LT, one unit each: $948.66 + $474.33	NCCI Chapter I, Section V for the surgeon; Claims Processing Manual, Chapter 14 for the ASC
Left endoscopic release converted to open	64721-LT, G56.02; no 29848	64721-LT	NCCI Chapter VIII, Section C.13; add 22 only with documented extra work
Planned staged release: right side March 3, 2026, left side April 14, 2026	First claim 64721-RT, G56.03; second claim 64721-58-LT, G56.02	64721-RT, then 64721-LT	The first op note documents the plan, and a new 90-day global starts with the second side
Right release plus right middle trigger finger	64721-RT (G56.01); 26055-F7 (M65.331), with 51 if the payer asks	Both lines, second at 50%	Medicare pays 26055 at 50%, or $143.79 in a facility
Right release plus Guyon’s canal release through a separate incision	64721-RT (G56.01); 64719-XS-RT (G56.21)	Both lines, second at 50%	64719 pays 50%, about $193.89, with documented ulnar nerve compression
New patient seen the day before surgery, when the surgeon decides to operate	Day 1: 99203-57 (G56.01); day 2: 64721-RT	64721-RT	Modifier 57 marks the decision-for-surgery visit; see CPT 99203 new patient visits
Distal radius fracture fixation with the release through the same approach	25607-RT alone, with the fracture diagnosis from the S52.5 family coded to all seven characters	25607-RT	64721 is column 2 of 25607 in the PTP edits

Coders miss two of these rows more than the rest. The bilateral row changes format between the surgeon’s claim and the ASC’s claim, and First Coast, a Medicare contractor, says “ASCs would not use modifier -50.” The staged row changes the diagnosis between surgeries even though both wrists had CTS from the start.

Payment modifiers go before RT or LT on the claim line, so 64721-58-LT reads the way payers expect, while 64721-LT-58 can trip a payer edit. Keep that order on staged and distinct-procedure lines.

CPT 64721 Denials and How to Fix Them

CPT 64721 denials come back with a small set of claim adjustment reason codes (CARCs), and each one points to a specific fix: a side or modifier error, a bundled second procedure, units over the daily limit, a missing authorization, or a medical necessity gap. Read the code on the remittance before you rework the claim.

The table uses definitions from the X12 claim adjustment reason codes list, the standard behind the codes on your 835 remittance.

64721 denial codes and fixes

CARC	What it means (X12)	Typical 64721 cause	Fix
CO-4	Procedure code inconsistent with the modifier	RT or LT missing; modifier 50 on an ASC claim; 50 plus RT and LT on one line	Correct the modifier and resubmit
CO-11	Diagnosis inconsistent with the procedure	G56.02 on a 64721-RT line, or G56.00 on the claim	Code the operated side
CO-97	Included in another service already adjudicated	29848 or 20526 on the same wrist; a routine post-op visit billed inside the 90 days	Don’t rebill; use 24 or 79 for something unrelated
CO-236	Not compatible with another procedure on the same day under NCCI	64719 or 25111 billed without XS; 69990 or 01810 (indicator 0)	Add XS with separate-site documentation, and remove indicator 0 codes
CO-151	Information doesn’t support this many services (Noridian uses it for MUE denials)	Two units on one line, or RT and LT lines on a physician claim	Rebill as 64721-50, one unit. CMS MLN Matters SE1422 says, “Do not use modifiers RT and LT when modifier -50 applies.”
CO-197	Precertification or authorization absent	Plan authorization missing, or on file for 29848 when the case converted to 64721	Request a retro authorization under the plan’s rules; see eligibility vs prior authorization
CO-50	Not deemed a medical necessity	Criteria missing from the chart, or 64728 under Anthem or Premera	Appeal with the nerve study results or CTS-6 score and the conservative care dates

Appeal or Correct? Fixing a Denied CPT 64721 Claim

Start by sorting the denial. Coding errors in the side, the modifier, or the units need a corrected claim, and Medicare handles minor clerical errors as reopenings through your MAC. An MUE denial with MAI 2 belongs in that group too, because NCCI Chapter I, Section V bars an override on reopening or redetermination.

Bundling and medical necessity disputes go to a redetermination. CMS gives the appellant “120 days from the date of receipt of the initial claim determination to file a redetermination request,” and in most cases the MAC sends its decision “within 60 days of receipt of the request for redetermination.” Commercial plans follow the appeal window in your contract.

Appeals on 64721 turn on op note language, so the team working them needs the full chart along with the remittance. Our denial management services work each appeal from the chart, recovering the current denial while tracing its cause back to the front end.

Denied 64721 claims that sit past 90 days while someone waits on records need an owner, because filing and appeal windows keep running. That backlog is where aged claim recovery work starts.

If your 64721 denials keep landing in the same two or three reason codes, you’re looking at a pattern. Our team sorts denials within 24 hours and fixes the rule behind them through orthopedic denial management, so the next bilateral or staged case goes out clean.

CPT 64721 FAQs

What Is the CPT Code for Carpal Tunnel Surgery?

The CPT code for carpal tunnel release surgery depends on the approach. Report 64721 for an open release, 29848 for an endoscopic release, and 64728 for a percutaneous release with balloon dilation, a code that took effect January 1, 2026.

Append RT or LT, and report 64721 alone when an endoscopic case converts to open. Code from the op note, since the approach can change in the operating room.

What Is the CPT Code for Wrist Surgery?

No single code covers wrist surgery. Most open wrist procedures sit in the 25000 to 25999 range, and wrist arthroscopy runs from 29840 to 29848.

Carpal tunnel release lives in the Nervous System section as 64721, because the surgeon is treating the median nerve. A median nerve release belongs under 64721 even when the schedule calls it wrist surgery.

What Is CPT 64721 and CPT 29848?

Both codes release the transverse carpal ligament. 64721 does it through an open incision, and 29848 does it through a wrist endoscope. Each carries a 90-day global period and takes RT or LT.

29848 has the higher 2026 work RVU, 6.23 against 4.85, and a national facility rate of $485.65 against $423.19 for 64721. You can’t bill both on the same wrist.

Can CPT 64721 Be Billed for Both Wrists?

Yes. On a Medicare physician claim, bill 64721-50 with one unit, and Medicare pays 150%, which comes to $634.78 in a facility in 2026. An ASC bills 64721-RT and 64721-LT as two lines, with the second at 50%.

Some commercial plans want RT and LT lines from the surgeon too, so check the payer’s bilateral policy. A second wrist done later inside the 90 days takes modifier 58 if planned or 79 if not.

How Much Does Medicare Pay for 64721 in 2026?

Medicare’s 2026 national physician rate for 64721 is $482.64 in the office and $423.19 in a facility, at a $33.4009 conversion factor. Qualifying APM participants get $485.05 and $425.30 at $33.5675.

Facilities collect their own payment on top of that: $948.66 for an ASC and $1,995.02 for a hospital outpatient department under the July 2026 CMS addenda. Your locality and your contracts change the final figure.

How Much Is Carpal Tunnel Surgery With Insurance?

With Original Medicare, a patient’s national average share is about $273 in an ASC and $483 in a hospital outpatient department, based on Medicare.gov’s 2026 figures before any supplemental coverage.

Office cases carry 20% coinsurance on the allowed amount after the Part B deductible. Commercial patients pay their plan’s deductible and coinsurance on the contracted rate, so the plan’s cost estimator gives the most reliable number.

Does Carpal Tunnel Release Need Prior Authorization?

Original Medicare doesn’t require it. Carpal tunnel release isn’t on the hospital outpatient prior authorization list in 42 CFR 419.83. Medicare Advantage and commercial plans set their own rules, so check each plan at scheduling.

If the planned code changes, such as 29848 converting to 64721, update the authorization before the claim goes out. Anthem calls 64728 not medically necessary and Premera calls it investigational, so expect pushback on that code.

What Are the 64718, 64719, and 64727 CPT Code Descriptions?

The 64718 CPT code description covers ulnar nerve release at the elbow, and its two neighbors cover the wrist and the microscope add-on. In plain language, with 2026 national facility rates:

• 64718: ulnar nerve release or transposition at the elbow, $575.16
• 64719: ulnar nerve release or transposition at the wrist (Guyon’s canal), $387.78
• +64727: internal neurolysis with an operating microscope, added to a neuroplasty code, $144.96

64718 and 64719 carry 90-day global periods like 64721. As an add-on, +64727 has no global period of its own and follows the primary code.

What Is CPT 64722, and Can It Replace 64721?

The 64722 CPT code description, paraphrased, is decompression of an unspecified nerve, with the nerve named in the record. It can’t stand in for 64721, because 64721 is the specific code for the median nerve at the carpal tunnel.

NCCI also lists 64722 as a column 2 code of 64721, with modifier indicator 1, so an extra 64722 line needs a separate site and a modifier to pay.

What Is CPT Code 64708?

CPT 64708 is an open neuroplasty of a major arm or leg nerve that no other code names. For a nerve of the hand or foot, CPT 64704 applies instead.

Neither one replaces 64721 at the carpal tunnel, and NCCI lists 64721 as a column 2 code under both of them, with modifier indicator 1. Code 64721 whenever the op note describes the median nerve at the carpal tunnel.

Getting 64721 Claims Paid the First Time

A clean CPT 64721 claim comes from five checks before submission. You pick the code from the approach, and the modifier and diagnosis from the operated side. Then you match the claim format to the setting, clear any second procedure through NCCI, and make sure the chart proves medical necessity in the payer’s own terms.

If you’d rather hand that workflow to a team that bills orthopedic surgery claims, look at our hand surgery billing support. For a smaller first step, send us your last 90 days of hand surgery claims for a free revenue cycle audit, and we’ll show you where 64721 payments are leaking.