What is the correct order from largest to smallest division of the Current Procedural Terminology hierarchy?

The correct order from largest to smallest division of the Current Procedural Terminology (CPT) hierarchy is: Category I codes, Category II codes, and Category III codes. Category I codes are the most comprehensive and cover a wide range of medical procedures and services. Category II codes are supplemental tracking codes for performance measures, while Category III codes represent temporary codes for emerging technologies, services, and procedures.