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.

Question

Quizplus · Accepted Answer

The correct coding involves 36415 for the venous draw, 85610 for the prothrombin time test, Z51.81 for encounter for therapeutic drug monitoring, Z79.01 for long term (current) use of anticoagulants, and I48.91 for unspecified atrial fibrillation. These codes accurately describe the procedure and the reasons for the patient's visit and treatment.

A Patient Taking Warfarin for Atrial Fibrillation Reports to the Lab