Fistula, unspecified ankle

This code describes an abnormal, uncharacterized connection or passageway originating in or around the ankle joint. This fistula could be between two epithelialized surfaces, such as skin to joint space, or skin to bone, and its specific type or cause is not documented.

Use this code when documentation clearly indicates the presence of a fistula involving the ankle, but the specific type (e.g., enterocutaneous, arteriovenous) or underlying cause is not specified. This code is appropriate when the physician's notes identify the anatomical location as the ankle, but lack further detail regarding the fistula's characteristics.

• Do not use if the specific type of fistula is known; instead, code to the most specific type available.
• Always review documentation for laterality (right, left, bilateral) to ensure the correct 7th character is applied.
• Consider if an underlying condition causing the fistula (e.g., infection, trauma) should be coded as a primary or secondary diagnosis.