What are external cause codes and when should they be used?

• A. Codes V00-Y99 used to identify the external cause of injury or accident when documented.
• B. Codes V00-Y99 identify internal diseases.
• C. Codes V00-Y99 are used for billing telemedicine.
• D. Codes V00-Y99 indicate severity of injury.

Answer: (A)

External cause codes in ICD-10-CM (V00–Y99) are used to identify the external circumstances that led to an injury or accident when that information is documented. They capture details such as the mechanism of injury (for example, fall, vehicle crash), the intent (accidental, self-harm, assault), the place where the event occurred, and the activity the person was engaged in at the time. These codes are typically added as a secondary diagnosis to the principal injury or condition to provide context for data collection, prevention efforts, and sometimes billing. They are not used for internal diseases, they don’t pertain to telemedicine billing, and they do not indicate the severity of the injury. The key idea is that they identify the external cause of the injury when the documentation includes that information.