Wiki Prothrombin denial

You need to code for both the reason for anticoagulation use (A.fib, chronic DVT, Hx of PE) and then Z79.01 status code.
Also, for Medicare a QW modifier is required.
 
To code for a visit for a PT due to the anticoagulant drug you should use the Z51.81 first the Z79.01 next and third the chronic condition.
 
In our office we use:

Z51.81 - Encounter for therapeutic drug level monitoring
(reason for drug ex: afib)
Z79.01 - Use of anticoagulants
 
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