Mallet finger of right finger(s)

This code describes a deformity of the right finger(s) characterized by an inability to actively extend the distal interphalangeal (DIP) joint. It typically results from a rupture or avulsion of the extensor tendon at its insertion into the distal phalanx, causing the fingertip to remain in a flexed position.

Assign this code when documentation clearly indicates a mallet finger affecting any digit of the patient's right hand. This diagnosis is supported by physical examination findings demonstrating a dropped DIP joint and inability to actively extend it, often following a direct impact to the fingertip.

• Ensure laterality is explicitly documented as "right" to support this specific code.
• Distinguish from other finger deformities like Boutonnière deformity, which affects the PIP joint.
• Look for documentation of the cause (e.g., trauma) which may require an external cause code in addition.