What is the maximum number of digits for Category I CPT codes?

Category I CPT codes are designed to represent services and procedures that are commonly performed in clinical practice. These codes are specifically structured and consist of five digits. The format helps ensure that each procedure or service has a distinctive code that can be universally understood in the medical community.

The five-digit code structure allows for a wide range of services to be categorized effectively, while still ensuring that the codes remain manageable and practical for billing and documentation purposes. Categories II and III codes differ in their structure and purpose, but for Category I codes, the standard remains strictly five digits. Therefore, the correct maximum number of digits for Category I CPT codes is five.