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Thread: Base units vs. Time units

  1. #1
    Join Date
    Apr 2007

    Question Base units vs. Time units

    AAPC: Back to School
    Is there such a thing as base start up units for CPT code 01992 modifier QZ

    I was told that the base units for Pain Management cases were 5

    The base units for an ortho were 3

    and The base units for Spine were 11-13 units

    and that you add that to the time units and that is how many units you bill is that correct?

  2. #2


    Anesthesia calculation-(Base Value Units + Time Units) x Conversion Factor = Reimbursement.
    A second modifier can be used to indicate the status of the patient. Some of the status modifiers add additional time units to the claim.
    The system will automatically add these units. Do not include these extra units in the billed units.
    Time Unit Calculation Examples
    Example 1:
    Modifier = AA
    Start time = 9:00
    Stop time = 11:24
    Total time is 2 hours 24 minutes
    One time unit = 15 minutes
    Total time units = 10
    Hope this helps!!
    Nalini CPC

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