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6.3.4.10.1 State-Defined Modifiers
Modifiers U1 (indicating one Medicaid claim) and U2 (indicating two Medicaid claims, one by the supervising anesthesiologist and one by the CRNA) are state-defined modifiers that must be billed by an anesthesiologist or CRNA.
Modifier U1, indicating that only one Medicaid claim will be submitted, cannot be billed by two providers for the same procedure, client, and date of service. Modifier U2, indicating that two Medicaid claims will be submitted, can only be billed by two providers for the same procedure, client, and date of service if one of the providers was medically directed by the other. Denied claims may be appealed with supporting documentation of any unusual circumstances.
Anesthesia providers must submit the U1 or U2 modifier with an appropriate pricing modifier when billing for anesthesia procedure codes.
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