procedure code for a1c test
â¢83037: Hemoglobin; glycosylated (A1C) by device cleared by FDA for home use.[5]. A1CNow+ is approved for use with either a capillary or venous blood specimen. Note 1: CPT code 83037 may be billed when an A1C test is performed in a providerâs office using a device cleared by the FDA for home use. CPT code 83037 is not intended to report an A1C test result that is obtained in a patientâs home by the patient or family.[6]. Note 2: The QW modifier should be used when coding for Medicare and Medicaid beneficiaries.