Dislocation of metacarpophalangeal joint of left thumb, subs

This code signifies a follow-up encounter for a patient who has previously sustained a dislocation of the joint connecting the metacarpal bone to the first phalanx of their left thumb. This injury involves the displacement of the bones at this specific joint.

Apply this code when documenting subsequent care for a patient with a previously diagnosed left thumb metacarpophalangeal joint dislocation. This includes visits for cast changes, physical therapy, follow-up imaging, or monitoring of healing after the initial treatment.

• Ensure the documentation clearly indicates a "subsequent encounter" for the injury.
• Verify the laterality is specifically for the left thumb.
• Confirm the joint involved is the metacarpophalangeal joint, not the interphalangeal joint.