Unsp fx first MC bone, unsp hand, subs for fx w malunion

This code describes a situation where a patient is receiving follow-up care for a fracture of the first metacarpal bone (thumb) that has healed incorrectly or incompletely. The specific hand affected is not documented, and the exact nature of the fracture is also unspecified.

Use this code when a patient presents for ongoing management of a previously sustained, unclassified first metacarpal fracture that has developed malunion. This typically occurs during rehabilitation or follow-up appointments after initial treatment, where the bone has healed in an abnormal alignment.

• Ensure documentation clearly indicates a "subsequent encounter" for the fracture.
• Verify that the malunion is explicitly stated or clearly implied in the clinical notes.
• If the specific hand or fracture type is known, a more specific code should be sought.