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The Official UB-04 Data Specifications Manual 2025, copyrighted by the American Hospital Association, is the only official source of UB-04 billing information adopted by the National Uniform Billing Committee (NUBC).
Surgeons append modifier 66 to claims indicating they were on a team of surgeons performing a specific procedure on the same patient during the same operative session. Billing modifier 66 requires documentation to support the claim.
Read this article, which provides billing guidance for acute kidney injury.
Use this decision flowchart to assist in correctly applying the 25 modifier.
Use this decision flowchart to assist in correctly applying the 57 modifier.
Effective July 1, 2026, new billing instructions apply related to no longer submitting the AX modifier and hemodiafiltration and AKI claims.