Unsp fx upper end of unsp ulna, subs for clos fx w nonunion

This code describes a fracture of the upper portion of the ulna (one of the two bones in the forearm) where the specific type of fracture is not documented. It indicates that the patient is receiving follow-up care for a closed fracture (skin intact) that has failed to heal properly, resulting in a nonunion.

Use this code for subsequent encounters when a patient presents with a previously diagnosed, unspecified closed fracture of the proximal ulna that has not united. This typically occurs when a physician is managing the ongoing care of a nonunion, such as evaluating for surgical intervention or monitoring conservative treatment.

• Ensure documentation clearly states "nonunion" for a closed fracture of the upper ulna.
• Verify that the encounter is for subsequent care, not the initial treatment of the fracture.
• If the specific type of fracture (e.g., olecranon, coronoid process) is known, a more specific code should be used.