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

This code signifies a fracture at the base of a metacarpal bone, excluding the thumb, which has not shifted from its original position. The fracture has failed to heal properly, resulting in a nonunion, and the patient is presenting for follow-up care or treatment related to this ongoing issue.

This code is appropriate for encounters where a patient is being managed for a previously diagnosed, non-healing fracture at the base of a metacarpal bone other than the first. This includes visits for continued conservative management, evaluation for surgical intervention, or post-operative care for a nonunion.

• Ensure documentation clearly specifies "nonunion" and the "base" of a metacarpal other than the thumb.
• Verify that the fracture is explicitly stated as "nondisplaced" to avoid using codes for displaced fractures.
• Confirm this is a "subsequent encounter" for the fracture, not the initial treatment.