What is ancillary coding?

Ancillary coding refers to the process of assigning medical codes to services and procedures that support patient care but are not the primary reason for a healthcare visit. These services can include laboratory tests, radiology imaging, physical therapy, and other supportive treatments. Ancillary coders ensure that these services are accurately documented and billed, supporting proper reimbursement and compliance with healthcare regulations. The role requires knowledge of medical terminology, coding systems such as CPT and ICD-10, and attention to detail.