Final answer:
CPT codes are divided into four categories: Category I, Category II, Category III, and Category IV.
Step-by-step explanation:
The answer to the question is a. 4. CPT codes, or Current Procedural Terminology codes, are used for billing purposes in healthcare. They are divided into four categories: Category I, Category II, Category III, and Category IV. Each category serves a different purpose and provides specific information about medical procedures and services.