Which classification system is used primarily for billing and statistical purposes in medical diagnoses?

The International Classification of Diseases (ICD) is used primarily for billing and statistical purposes in medical diagnoses. ICD codes provide a standardized system for classifying diseases, allowing for consistent recording and reporting of health conditions across various healthcare settings. This classification is essential for billing health insurance and reimbursement processes.

ICD is utilized globally to track disease incidence and prevalence, improve health management, and facilitate communication among healthcare providers and insurers. By using these codes, healthcare professionals can ensure accurate documentation of diagnoses, making them essential not only for billing but also for public health tracking and research.

Other classification systems, such as CPT (Current Procedural Terminology), primarily focus on reporting medical procedures and services rather than diagnoses. HCPCS (Healthcare Common Procedure Coding System) includes codes for various healthcare services and supplies, including some aspects of ICD but not main diagnostic coding. DRG (Diagnosis-Related Groups) is primarily used for inpatient hospital billing based on diagnosis-related criteria but is not a classification system for diagnoses on its own. Thus, the primary purpose of ICD in relation to billing and statistical purposes makes it the correct choice.