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Thread: 50 modifier and number of units

  1. #1

    Default 50 modifier and number of units

    AAPC: Back to School
    When you append the 50 modifier for bilateral service, double the charge, DO you also bill out at 2 units?

    Thank you

  2. #2
    Join Date
    Apr 2007
    North Carolina


    I only have one carrier that requires 2 units. All other carriers require 1 unit.

  3. #3


    Although I do not have a reference; i would report the procedure with the modifier -50, the appropriate price (reflecting B/L proc) and one unit. Reporting the procedure with the -50 at 2 units would indicate that you performed the bilateral procedure twice.

    Hope this helps
    Anthony McCallum, CPC, CIRCC, CPC-I, CCS

  4. #4
    Join Date
    Apr 2007
    North Carolina


    Excerpt from BCBSNC's administrative website.......

    "Modifier -50 should be used for bilateral procedures. Bilateral procedures should be listed on the claim as a single line item, with modifier -50, and a two in the units field."

    This could become carrier specific but again...this in my only carrier, in my region, that has this requirement.

  5. #5
    Join Date
    Apr 2007


    this is definitely carrier driven. I have carriers that want them on separate lines with rt/lt rather than the 50 modifier.

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