A patient taking warfarin for atrial fibrillation reports to the lab for a venous draw for prothrombin time for her monthly INR evaluation. This is her third such visit in the past 90 days. She will see her physician in two days to review the results. Select the appropriate CPT and ICD-10-CM codes.

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36415 is the CPT code for a routine venipuncture, which is necessary for drawing blood. 85610 is the CPT code for the prothrombin time test. Z51.81 is the ICD-10-CM code for encounter for therapeutic drug level monitoring, Z79.01 is for long term (current) use of anticoagulants, and I48.91 is for unspecified atrial fibrillation, all of which are relevant to the patient's situation.

A Patient Taking Warfarin for Atrial Fibrillation Reports to the Lab