ASC Ancillary Services

This hub covers CPT and HCPCS codes recognized as ancillary services in the ambulatory surgery center setting. These are not the surgical procedures themselves. They are the imaging, guidance, drugs, and other integral services that support a covered surgery. Codes here include things like ultrasound guidance for a biopsy (76942) and needle localization by X-ray (77002), the kinds of services that accompany a primary procedure rather than stand alone as the reason for the visit.

For an ASC, the practical point is how these services are paid. Many ancillary services are packaged into the payment for the surgical procedure they support, so the ASC may not receive a separate line-item payment for them. Some ancillary services are paid separately. Ancillary status tells you the service is recognized in the ASC setting, but it does not by itself tell you whether a given line is paid separately or bundled. That distinction drives whether it is worth reporting on the claim and what to expect on the remittance.

Billers should read this category as a reminder to check the payment indicator behind each code, confirm the service is tied to a covered surgical procedure, and document medical necessity for the guidance or imaging performed. Codes carrying a T (Category III) suffix, such as 0331T for planar cardiac sympathetic imaging or 0422T for tactile breast imaging, often have payer-specific or investigational treatment, so verify coverage before scheduling. DataLily AI shows what commercial plans pay for these codes and which providers perform them most.