Monteggia's fx l ulna, subs for opn fx type I/2 w nonunion

This code signifies a Monteggia's fracture involving the left ulna that was initially an open fracture of type I or II, and is now experiencing nonunion. A Monteggia's fracture is a specific type of forearm fracture involving a fracture of the ulna and a dislocation of the radial head. Nonunion indicates that the bone has failed to heal after a significant period.

This code is appropriate for patients presenting for follow-up care of a previously treated open Monteggia's fracture of the left ulna (type I or II) where the fracture site has not united. This would typically be used when the patient is undergoing ongoing management for the nonunion, such as further surgical intervention or conservative treatment.

• Ensure documentation clearly specifies "left" ulna and confirms the original fracture was an "open" type I or II.
• Verify that the current encounter is for the management of "nonunion" and not just routine follow-up of a healing fracture.
• Remember to also code any associated complications or the specific type of nonunion if further specified (e.g., infected nonunion).