Nondisp fx of shaft of MC bone, subs for fx w nonunion

This code describes a situation where a patient has a fracture in the shaft of a metacarpal bone (excluding the thumb) that was initially nondisplaced, but has failed to heal properly, resulting in a nonunion. This indicates a complication in the healing process of a previously sustained fracture.

This code is appropriate for follow-up encounters where a physician is managing a patient whose nondisplaced metacarpal shaft fracture (other than the thumb) has been diagnosed with nonunion. This would include visits for ongoing assessment, treatment planning, or monitoring of the nonunion.

• Ensure documentation clearly states "nonunion" as the complication of the fracture healing.
• Verify the fracture location is the shaft of a metacarpal bone, excluding the first (thumb) metacarpal.
• Confirm this is a subsequent encounter for the fracture, not the initial treatment.