Ankylosis, unspecified ankle

This code signifies the pathological fusion or immobility of an unspecified ankle joint. This stiffness can result from various underlying conditions, leading to a significant loss of range of motion and functional impairment.

Apply this code when documentation clearly indicates ankylosis of the ankle, but the specific ankle (right or left) is not specified. This is appropriate for conditions like post-traumatic arthritis, inflammatory arthropathies, or congenital fusion where the laterality is unstated.

• Ensure the documentation explicitly states "ankylosis" or "fusion" of the ankle.
• Avoid using this code if the laterality (right or left ankle) is documented; instead, use the more specific codes.
• Consider additional codes for the underlying cause of the ankylosis, if known and documented.