Swan-neck deformity of unspecified finger(s)

This code signifies a swan-neck deformity affecting one or more fingers, where the specific finger(s) involved are not documented. This deformity is characterized by hyperextension of the proximal interphalangeal (PIP) joint and flexion of the distal interphalangeal (DIP) joint, often resembling a swan's neck. It can be caused by various underlying conditions, including rheumatoid arthritis, trauma, or neurological disorders.

Use this code when documentation clearly indicates a swan-neck deformity of the finger(s) but does not specify which finger(s) are affected (e.g., "swan-neck deformity of the hand"). This code is appropriate when the provider's assessment or imaging reports confirm the presence of this specific digital deformity without further anatomical detail.

• Avoid using this code if the specific finger(s) affected are documented; instead, use the more specific codes (M20.031-M20.038).
• Ensure the medical record explicitly states "swan-neck deformity" and not another type of digital deformity.
• Code any underlying conditions causing the swan-neck deformity, such as rheumatoid arthritis, in addition to this code.