Dislocation of metacarpophalangeal joint of unsp thumb, init

This code signifies a complete displacement of the bones forming the joint at the base of the thumb, specifically the metacarpal and proximal phalanx. This injury disrupts the normal alignment and function of the thumb's main joint.

Apply this code when documenting a patient's initial presentation for a dislocated metacarpophalangeal joint of an unspecified thumb. This includes the initial assessment, diagnosis, and treatment of the acute injury.

• Ensure documentation specifies "dislocation" rather than a subluxation or sprain.
• Confirm the injury involves the metacarpophalangeal joint, not the interphalangeal joint.
• The "A" seventh character indicates an initial encounter for active treatment of the injury.