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It is not acceptable for the AA modifier to be billed with any of the other above modifiers for the same anesthesia service. In fact, the OIG has listed this issue as part of their 2013 Workplan for Medicare Part B claim reviews .Modifier 25 Fact Sheet What You Need To Know. The Modifier 25 is defined as a significant, separately identifiable Evaluation and Management (E/M) service by the same physician or other qualified health care professional on the same day of a procedure or other service.When billing for durable medical equipment (DME), use the appropriate HCPCS code and modifier(s) to describe the items being billed. Also include an ICD-9/ICD-10 diagnosis code indicating the medical condition for which the item has been prescribed. What is modifier 90 & 91,Medicare Part B modifiers - 90 Reference (Outside) Laboratory: When laboratory procedures are performed by a party other than the treating or reporting physician, the procedure may be identified by adding the modifier 90 to the usual procedure number. Use modifiers -59, -91 to "explain" duplicate codes HCPro Coder Connection, November 17, 2004. Use modifiers -59, -91 to "explain" duplicate codes. Modifiers -59 and -91 can help hospitals reduce denials from Medicare fiscal intermediaries (FIs) when billing duplicate CPT codes or a single CPT code with multiple units of service.