Subluxation of MCP joint of right thumb, init

This code signifies a partial dislocation of the joint connecting the right thumb's metacarpal bone to its first phalanx. The joint surfaces are no longer in proper alignment, but remain in partial contact. This injury typically results in pain, swelling, and limited range of motion in the affected thumb.

Apply this code for the initial treatment of a patient presenting with a subluxation of the right thumb's metacarpophalangeal joint. This includes emergency department visits, initial physician office evaluations, or the first encounter for this specific injury. It is appropriate when the injury is acute and the patient is receiving active treatment.

• Ensure documentation specifies "right thumb" and "metacarpophalangeal joint" to support this specific code.
• Confirm the encounter is the initial one for this injury; subsequent encounters will require a different seventh character.
• Distinguish subluxation from a complete dislocation, which would be coded differently.