Boutonniere deformity of right finger(s)

This code signifies a Boutonnière deformity affecting one or more fingers on the patient's right hand. This condition is characterized by hyperextension of the metacarpophalangeal (MCP) and distal interphalangeal (DIP) joints, with flexion of the proximal interphalangeal (PIP) joint. It typically results from a rupture or stretching of the central slip of the extensor tendon.

Apply this code when documentation clearly states a diagnosis of Boutonnière deformity specifically impacting the right finger(s). Supporting documentation should include physical exam findings detailing the characteristic joint deformities (PIP flexion, DIP/MCP hyperextension) and laterality. This code is appropriate for both acute and chronic presentations of the deformity.

• Ensure the documentation specifies "right" finger(s) to avoid laterality errors.
• Do not confuse this with Swan neck deformity, which presents with opposite joint deformities.
• Code any underlying cause, such as rheumatoid arthritis (M05.xx, M06.xx), or trauma (S63.x), as a secondary diagnosis.