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CPT Code for Hemoglobin A1c: 83036 and 83037 Billing Guide for 2026

CPT code for A1c billing 2026 hero banner: 83036 lab test versus 83037 FDA-cleared home device, QW modifier tied to CLIA certificate type, R73.09 covered versus R73.03 denied for prediabetes, Z13.1 screening with modifier TS since January 2024, and the CO-50, CO-151, and CO-16 denial codes, from ClaimMax RCM.

The CPT code for A1c is 83036 when a laboratory runs the test. CPT 83037 applies when the analyzer holds FDA clearance as a home-use device. That part of the decision takes about four seconds. Collecting on the claim takes longer. Look up the number and you’ll have the code and nothing else. You’ll lose […]