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Add-on codes

We deny CPT and HCPCS add-on codes that are billed without a base code. There are CPT and HCPCS defined add-on codes for which the AMA has not assigned specific base code(s). If there is not an exact code-to-code match of an add-on code to a base code, we will use a general match for each add-on code. We will deny the add-on code if we do not find a match.