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Code 99363 Supervision of Warfarin Therapy

  1. Default Code 99363 Supervision of Warfarin Therapy
    Medical Coding Books
    Can anyone tell me if this code can be used at the onset of PT INR checks or do you have to wait until you have had a minimum of 8 INR measurements before you can bill this code.

    Thanks for any clarification.

    Deborah McNeilance

  2. #2
    Yes, you have to have a minimum of 8 Inr to bill 99363. Our office bills the 99363 for the initial Management(Initial 90 days) and 99364 for Subsequent management, each 90 days, min. 3 Inr. We do not have much luck getting paid for these, very few get paid and they are usually be a Medicare Managed Care Plan or PFFS plan. Good luck!


  3. Default 99363/99364
    Hi, our office is just beginning to bill for 99363/99364, we need clarification on DOS to use as most insurance companies have a 90 day timely filing (exluding MCR), can you share which date you use?

  4. #4
    Columbia, MO
    the date you use is the date of the encounter. I think you misunderstand the code.. this is not a hold and wait 90 days to bill, it is a visit that occurs 90 days after the initiation of treatment as long as you have a minimum of 8 PT/INR results between the date you started the therapy and the date of this encounter.(99363) and then 3 results in the 90 days between the 99363 and the 99364

    Debra A. Mitchell, MSPH, CPC-H

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