Which code set is predominantly utilized for outpatient procedures?

CPT codes are predominantly utilized for outpatient procedures because they are specifically designed to describe medical, surgical, and diagnostic services provided to patients in an outpatient setting. The Current Procedural Terminology (CPT) system, developed by the American Medical Association, includes codes that reflect the nature of the services performed, such as evaluations, consultations, surgeries, and other treatment modalities that occur outside of an inpatient hospital environment.

In contrast, ICD codes (International Classification of Diseases) are primarily used for diagnosis coding, reflecting the conditions or diseases being treated, rather than the procedures performed. HCPCS codes (Healthcare Common Procedure Coding System) include a broader category of services and supplies, often used for items not covered by CPT, such as certain non-physician services and durable medical equipment. DRG codes (Diagnosis-Related Groups) are utilized for inpatient hospital billing and reflect classifications of inpatient stays; they determine reimbursement for hospital services rather than outpatient procedures.

Therefore, CPT codes are essential for detailing the specific procedures and services rendered in outpatient care, making them the correct choice for this question.