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Q&A: Payer rejects claims with modifier -AS

Q: When we send in a claim for CPT® code 29898 (arthroscopy, ankle, surgical; debridement, extensive) to Aetna with modifier –AS (non-physician assisting at surgery) for our physician’s assistant, Aetna will deny the claim saying “assistant not covered.” However, that procedure code says it is covered for an assistant surgeon. I have sent appeal after appeal and printouts from the American College of Surgeon’s (ACOS) Coding Today website showing this procedure code is payable to Aetna, and Aetna still denies the claim. Medicare pays on this claim, why wouldn’t Aetna?

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