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December 2016 Texas Medicaid Provider Procedures Manual

Section 6: Claims Filing : 6.2 TMHP Electronic Claims Submission : 6.2.5 Modifier Requirements for TOS Assignment : Anesthesia
For anesthesia procedures, use one of the following modifiers: AA, AD, QK, QS, QX, QY, and QZ. Using these modifiers results in TOS 7 being assigned to the procedure.

Texas Medicaid & Healthcare Partnership
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