Other disorders of continuity of bone, left humerus

This code signifies a disruption in the normal structure or integrity of the left humerus bone, excluding fractures or nonunions specifically classified elsewhere. It encompasses conditions like stress fractures, bone cysts, or other pathological processes that compromise the bone's continuity without meeting the criteria for a traumatic fracture or established nonunion.

Utilize this code for diagnoses such as insufficiency fractures, pathological fractures due to underlying disease (e.g., metastatic bone disease, osteomyelitis) that haven't yet progressed to a complete fracture, or other specified structural defects of the left humerus. Documentation should clearly indicate a disruption of bone continuity in the left humerus, specifying it is not a traumatic fracture or a defined nonunion.

• Ensure documentation specifies "left humerus" to support laterality.
• Distinguish carefully between this code and codes for traumatic fractures (S42.-) or nonunions (M84.3-).
• Always code the underlying cause of the bone disorder (e.g., malignancy, infection) first, if applicable.