Swan-neck deformity of left finger(s)

This diagnosis code signifies a specific deformity affecting the left finger(s) characterized by hyperextension of the proximal interphalangeal (PIP) joint and compensatory flexion of the distal interphalangeal (DIP) joint. This configuration resembles a swan's neck, leading to functional impairment and potential pain.

Assign this code when documentation explicitly states "swan-neck deformity" affecting any finger(s) on the patient's left hand. This condition is often associated with inflammatory arthropathies like rheumatoid arthritis, but can also result from trauma or neurological conditions.

• Ensure the documentation specifies "left" finger(s); otherwise, an unspecified or bilateral code may be more appropriate.
• Distinguish from Boutonnière deformity, which involves flexion of the PIP joint and hyperextension of the DIP joint.
• Look for underlying causes (e.g., rheumatoid arthritis) to code concurrently, as the swan-neck deformity is often a manifestation of another condition.