Clinical classification refers to the process of categorizing diseases or medical conditions based on their clinical features, symptoms, and other characteristics. This classification system helps in diagnosing and treating diseases by grouping them into distinct categories that share common characteristics and have similar clinical outcomes. Clinical classification systems can vary depending on the medical specialty and the specific disease being categorized. Examples of clinical classification systems include the International Classification of Diseases (ICD), which is used to classify and code diagnoses for billing and statistical purposes, and the American Joint Committee on Cancer (AJCC) staging system, which is used to classify and stage various types of cancers based on the extent of the disease.