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

This code signifies an unspecified fracture of the shaft of the left humerus that has failed to heal properly, as documented during a subsequent encounter. The "unspecified" nature means the specific type of fracture (e.g., transverse, oblique) is not detailed, but the location and nonunion complication are clearly identified.

Apply this code when a patient presents for follow-up care of a left humeral shaft fracture that has been diagnosed with nonunion, and the specific fracture type was not initially or subsequently documented. This is appropriate for ongoing management of the nonunion, such as preparing for revision surgery or monitoring conservative treatment.

• Ensure documentation clearly states "nonunion" for the left humeral shaft fracture.
• Verify this is a subsequent encounter, not the initial injury or a sequela.
• Do not use if a more specific fracture type (e.g., transverse, oblique) is documented.