Subluxation of metacarpophalangeal joint of unsp thumb, init

This code signifies a partial dislocation of the joint connecting the thumb's metacarpal bone to its first phalanx, where the joint surfaces are still in partial contact. This injury involves the thumb but does not specify which hand.

This code is appropriate for the initial visit or treatment of a patient presenting with a subluxation of the metacarpophalangeal joint of either the left or right thumb. It should be used when the documentation does not specify the laterality of the injury.

• Ensure documentation clearly states "subluxation" and not a full "dislocation" (which would be coded differently).
• Only use the "A" seventh character for the initial encounter for this injury. Subsequent encounters will require different seventh characters.
• If laterality (left or right thumb) is specified in the medical record, a more specific code should be chosen.