What modifier is used for an unlisted procedure code?

The appropriate modifier for an unlisted procedure code is not used directly with the unlisted procedure itself, but when such a code is submitted to provide additional context about the service performed. In the context of modifiers, -22 is particularly relevant when reporting an unlisted procedure code because it indicates that the service was more extensive than typically expected, which justifies the usage of an unlisted code.

When a procedure does not have a specific code within the established coding system, reporting it as unlisted allows medical providers to ensure they are compensated for services rendered that cannot be described by existing codes. The -22 modifier specifically signals that there were increased procedural services involved, providing a rationale for the use of an unlisted code, which can often help secure appropriate reimbursement.

The other options relate to different contexts. For example, -80 is used for surgical assistance when another physician assists in a surgical procedure, and -AS indicates a non-physician service, generally in relation to specific roles within a surgical team. -HG, on the other hand, relates to high-risk patients and not unlisted procedures. Thus, the focus of -22 on increased service aligns with the context of unlisted procedures in CPT coding.