Disp fx of neck of unsp MC bone, subs for fx w nonunion

This code signifies a displaced break in the neck of an unspecified metacarpal bone that has failed to heal properly. The patient is in a later stage of treatment, specifically addressing the nonunion of the fracture. This indicates the bone fragments have not united after a reasonable period, requiring further intervention.

This code is appropriate for encounters where a patient is being treated for a previously diagnosed displaced metacarpal neck fracture that has not healed. This includes follow-up visits for ongoing management of the nonunion, such as discussions about surgical options, casting changes, or physical therapy related to the nonunion. It would also be used for procedures performed to address the nonunion itself.

• Ensure documentation clearly states "nonunion" and specifies the metacarpal neck fracture is displaced.
• Verify this is a subsequent encounter, not the initial treatment for the fracture.
• Confirm the specific metacarpal bone is not identified in the documentation; otherwise, a more specific code should be used.