Path fx in oth disease, l humerus, subs for fx w nonunion

This code signifies a fracture of the left humerus that occurred due to an underlying disease process, rather than trauma. The fracture has failed to heal properly, resulting in a nonunion, and the patient is presenting for follow-up care related to this unhealed fracture.

Apply this code when documentation indicates a pathological fracture of the left humerus with nonunion, and the patient is seen for subsequent management of this specific fracture. This includes encounters for ongoing treatment, monitoring, or evaluation of the nonunion. The "K" seventh character mandates that this is not the initial encounter for the fracture.

• Ensure documentation clearly specifies "pathological fracture" and identifies the underlying disease if known (though not coded here).
• Verify laterality (left humerus) and the presence of nonunion.
• Confirm the encounter is for follow-up care of the fracture, not initial treatment or sequelae.