PT/INR checks

JRPAT

Patient's primary reason for home health is PT/INR checks for coumadin use, for past DVT's. Would I code Z51.81 (encounter for therapeutic drug level monitoring as primary)? Since patient does not have an active DVT at the moment.

JRPAT

So with private insurance you would use Z51.81?

KELott

You cannot just admit for lab in general, however if the PT/INR levels are not stable and the MD is making frequent adjustment. This patient may require medication management / dose changes and instruction on the proper diet ... then I would use

Z86.718 history of DVT
Z51.81 Monitoring Drug use
Z79.01 anticoagulant use