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

This code signifies a fracture of the neck of a metacarpal bone, excluding the thumb (first metacarpal), that has not shifted from its normal anatomical position. The "subsequent encounter" indicates the patient is receiving follow-up care for this fracture, and "nonunion" specifies that the bone fragments have failed to heal together after a reasonable period.

Use this code for patients presenting for ongoing treatment of a previously diagnosed, non-displaced fracture in the neck of the second, third, fourth, or fifth metacarpal. This applies when imaging or clinical assessment confirms that the fracture has not united and further intervention or management for the nonunion is being provided.

• Ensure documentation clearly specifies "nonunion" and a "subsequent encounter" for the fracture.
• Verify the fracture location is the "neck" of a metacarpal other than the thumb.
• Distinguish from malunion (improper healing) or delayed union (slower than expected healing).