Which coding system is primarily used for diagnostic coding?

The correct choice is ICD-10-CM, as it is specifically designed for diagnostic coding. This system provides a standardized method for classifying and coding diagnoses, symptoms, and procedures associated with healthcare. ICD-10-CM codes are used primarily in healthcare settings to reflect the patient’s condition and to facilitate accurate billing, data collection, and health statistics.

ICD-10-CM enables healthcare providers to communicate succinctly about patient diagnoses, ensuring that the information is universally understood within the medical community and by insurance payers. Its comprehensive classification covers a wide range of diseases, injuries, and health-related issues, making it essential for effective patient care and management within the healthcare system.

In contrast, the other coding systems serve different primary functions. CPT is focused on coding medical procedures and services rather than diagnoses. HCPCS encompasses a broader range of medical services, including non-physician services, but it also does not serve the primary function of diagnostic coding. SNOMED CT is a clinical terminology that provides a comprehensive vocabulary for electronic health records and is not primarily used for billing or diagnostic coding. Each of these systems serves a unique role in medical coding, but ICD-10-CM is specifically tailored for diagnoses.