Numeric designation preceded by the letter “V” that is a subclassification of ICD-9-CM coding known as The Supplementary Classification of Factors Influencing Health Status and Contact with Health Services (V01-V85) . For hospital inpatients, V codes are used to identify health care encounters that occur for reasons other than illness or injury and to identify patients whose injury or illness is influenced by special circumstances or problems such as chemotherapy, consultation, renal dialysis, or organ donor. For hospital outpatients, V codes are used to classify patient encounters for treatment of a current or resolving disease or injury. For ancillary diagnostic or therapeutic services, list the V code first followed by the code for the diagnosis that prompted the outpatient encounter.