Subluxation of carpometacarpal joint of unsp thumb, init

This code signifies a partial dislocation of the joint connecting a carpal bone to the metacarpal bone of the thumb, where the joint surfaces are still in partial contact. This injury involves the thumb's base, specifically the carpometacarpal (CMC) joint, but the specific thumb (left or right) is not documented.

Use this code for a patient presenting with a newly diagnosed subluxation of the thumb CMC joint, where the medical record does not specify which thumb is affected. This typically occurs following trauma, such as a fall or direct impact to the hand.

• Ensure documentation clearly states "subluxation" rather than a full "dislocation" to differentiate from other S63.0 codes.
• Confirm the encounter is the "initial encounter" for this specific injury; subsequent care would use a different seventh character.
• If the laterality (left or right thumb) is documented, a more specific code should be selected.