Monteggia's fx left ulna, subs for clos fx w nonunion

This code signifies a Monteggia's fracture involving the left ulna that has failed to heal properly (nonunion) and is currently under active treatment following the initial encounter. A Monteggia's fracture is a specific type of forearm fracture characterized by a fracture of the ulna with an associated dislocation of the radial head.

Use this code for patients presenting for follow-up care, cast changes, or other ongoing management of a left ulnar Monteggia's fracture where the fracture site has not united. This applies when the fracture is being treated non-surgically (closed fracture) and there's documented evidence of nonunion.

• Ensure documentation clearly specifies "nonunion" and that the encounter is for subsequent care, not the initial treatment.
• Verify the laterality is explicitly "left ulna" and that it's a Monteggia's type fracture.
• Confirm the fracture is being managed as a "closed" fracture, even if nonunion is present.