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Modifier AS

Surgical / provider-role

Modifier AS. PA, NP, or CNS as assistant at surgery — must accompany 80/81/82. Medicare pays the assistant-at-surgery rate (16%), and NPP services at 85% of that.

Reference only — CPT descriptors are AMA-copyrighted (paraphrased). Payment percentages and acceptance vary by payer; verify against the current CPT/HCPCS files and payer policy.

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