Unsp fx shaft of humerus, unsp arm, subs for fx w nonunion

This diagnosis code indicates a fracture of the main part of the upper arm bone (humerus) where the specific location or type of fracture is not documented. It specifies that the patient is in a subsequent phase of care for this fracture, and the bone has failed to heal properly (nonunion).

Use this code for follow-up encounters when a patient presents with a previously diagnosed, unspecified shaft of humerus fracture that has not united. This applies when the physician explicitly documents nonunion and the encounter is for ongoing management of this complication.

• Ensure documentation clearly states "nonunion" for a subsequent encounter.
• Verify that the fracture site is documented as the shaft of the humerus, but the specific type or location within the shaft is not specified.
• Do not use this code for initial encounters or for fractures that are healing normally.