Subluxation of carpometacarpal joint of right thumb, init

This diagnosis code signifies a partial dislocation of the joint connecting the trapezium bone in the wrist to the first metacarpal bone of the right thumb. This injury involves the joint surfaces losing their normal alignment, but not completely separating.

This code is appropriate for documenting an initial presentation of a right thumb carpometacarpal (CMC) joint subluxation, often resulting from a fall, direct trauma, or repetitive stress. It should be used when the patient is receiving active treatment for the injury.

• Ensure laterality (right thumb) is accurately documented in the medical record.
• Verify that the encounter is indeed the "initial encounter" for this specific injury. Subsequent care would require a different 7th character.
• Distinguish subluxation from a complete dislocation, which would be coded differently.