Ankylosis, left ankle

This code signifies the pathological immobility and fusion of the bones within the left ankle joint, resulting in a significant loss of range of motion. This condition can be caused by chronic inflammation, trauma, or degenerative processes, leading to a stiff and often painful joint.

Apply this code when documentation explicitly states ankylosis of the left ankle. This typically occurs in patients with advanced arthritis, post-traumatic joint fusion, or inflammatory arthropathies affecting the ankle. Supporting documentation should include physician notes detailing the diagnosis, laterality, and clinical findings consistent with joint immobility.

• Ensure the documentation specifies "ankylosis" and not just severe stiffness or limited range of motion, which may indicate other codes.
• Verify laterality; this code is specific to the left ankle. Use the appropriate code for the right or unspecified ankle.
• Consider sequencing this code after any underlying conditions (e.g., rheumatoid arthritis, osteoarthritis) that led to the ankylosis, if applicable.