Oth fx fourth MC bone, right hand, subs for fx w nonunion

This code signifies a fracture of the fourth metacarpal bone in the right hand that has failed to heal properly, indicating a nonunion. The patient is in a subsequent phase of care for this specific fracture complication.

Use this code when documenting ongoing treatment for a right fourth metacarpal fracture that has been diagnosed with nonunion, such as during follow-up appointments, surgical interventions to address the nonunion, or physical therapy sessions aimed at improving function despite the nonunion. It is appropriate for any encounter after the initial treatment of the fracture where nonunion is the primary focus.

• Always ensure documentation clearly specifies "nonunion" for the fourth metacarpal of the right hand.
• Verify laterality (right hand) and the specific bone (fourth metacarpal) are explicitly stated in the medical record.
• Confirm this is a subsequent encounter, not the initial treatment of the fracture or a routine follow-up for a healing fracture.