Which division is considered the fourth section in the CPT coding system?

The fourth section in the CPT coding system is correctly identified as "Subheading." The CPT coding system is organized into distinct structures where codes are classified to facilitate their use in medical billing and documentation. The main structure consists of three primary divisions: categories, sections, and subsections.

Within the second level, which is the section, you will find various subheadings that provide more specific categories of codes related to particular types of procedures or services. This organization clarifies the coding process, helping coders easily navigate through the extensive list of codes based on the anatomical site or specific procedures performed.

The term "subheading" reflects its role as a bridge between broad categories of services (sections) and the more detailed codes that follow, known as subsections, which directly relate to specific types of procedures. This hierarchical structure is essential for ensuring clarity and precision in coding practices.