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 CPT code for a venous draw is 36415, and 85610 for the prothrombin time test. The ICD-10-CM codes include Z51.81 for the encounter for therapeutic drug level monitoring (since the patient is on warfarin and the INR is being monitored), Z79.01 for long-term (current) use of anticoagulants, and I48.91 for unspecified atrial fibrillation, which is the reason the patient is on warfarin.

A Patient Taking Warfarin for Atrial Fibrillation Reports to the Lab