Question Anesthesia: Billing correct modifiers for codes 64640 for Multiple knee nerves

South Jordan , UT
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We are having issues with medicare paying multiple 64640 for multiple knee nerves.
PER MUE's they will allow up to 5.
We usually get paid on 2 of the 5.
What are the correct modifiers that need to be used?
MUE Adjudication Indicator (MAI): Describes the type of MUE (claim line or date of service).
MAI 1: Applied at line level (claim line) - Appropriate use of modifiers to report the same code on separate lines of a claim will enable the reporting of medically necessary units of service in excess of MUE
Modifier Examples: 76, 77, 91, RT, LT, F1, F2