Unsp fx lower end of right ulna, subs for clos fx w malunion

This code signifies a fracture of the distal portion of the right ulna where the specific type of fracture is not documented. It indicates that the patient is in a follow-up period for a previously treated closed fracture that has healed improperly, resulting in a malunion.

Use this code when a patient presents for ongoing care of a right distal ulnar fracture that has healed in an anatomically incorrect position, and the initial fracture type was not specified. This applies to subsequent visits after the initial treatment of the closed fracture.

• Requires an additional code for the specific type of malunion, if known (e.g., M84.4xxA).
• Ensure documentation clearly states "subsequent encounter" and "malunion" for a closed fracture.
• Verify laterality (right ulna) is accurately documented.