Oth fx first MC bone, right hand, subs for fx w malunion

This code signifies a healed but improperly aligned break in the first metacarpal bone (thumb) of the right hand. The patient is currently in a phase of treatment or recovery where the fracture has united, but with an undesirable angulation, rotation, or shortening that may impact hand function.

Apply this code when documenting follow-up care for a right first metacarpal fracture that has healed with a noticeable deformity. This includes situations where the patient is undergoing physical therapy, occupational therapy, or being evaluated for potential corrective surgery due to the malunion.

• Ensure documentation clearly states "malunion" and specifies the right first metacarpal.
• Verify this is a subsequent encounter, not the initial treatment for the fracture.
• Look for associated codes for any ongoing complications or procedures related to the malunion.