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Thread: Code 99363 Supervision of Warfarin Therapy

  1. #1

    Default Code 99363 Supervision of Warfarin Therapy

    AAPC: Back to School
    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. #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
    Join Date
    Apr 2007
    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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