What are CATEGORY I CPT Codes?

• A. Supplemental codes for performance measurement
• B. Temporary alphanumeric codes for new technology
• C. Procedure or Service: sub-categories based on procedure type and anatomy
• D. Immunization codes

Answer: (C)

Category I CPT codes are the standard five-digit codes used to report medical procedures and services. They are organized into subcategories based on the type of procedure and the anatomy involved, which helps coders and payers consistently describe what was done and for billing purposes. These codes are developed and maintained by the CPT Editorial Panel and form the primary language for reimbursement across Medicare, Medicaid, and private payers. They differ from Category II codes (used for performance measurement) and Category III codes (temporary codes for new or emerging technologies). While immunization administration codes exist within the CPT system, the essence of Category I codes is that they represent the broad set of procedures and services, not a narrow subset.