Bent bone of l ulna, subs for opn fx type I/2 w delay heal

This code describes a left ulnar shaft fracture where the bone has bent or deformed, rather than cleanly breaking. It specifically indicates that the fracture was initially an open fracture (Type I or II, meaning there was a wound communicating with the fracture site) and the patient is now in a subsequent phase of care due to delayed healing.

This code is appropriate for follow-up encounters when a patient with a previously diagnosed open Type I or II bent ulna fracture of the left arm is experiencing a slower-than-expected healing process. It would be used when the patient is still receiving active treatment for the delayed union, such as cast changes, physical therapy, or monitoring for further intervention.

• Ensure documentation clearly specifies "bent bone" or similar deformation of the ulna, not just a simple fracture.
• Verify the original fracture was an open Type I or II and that the current encounter is for delayed healing, not nonunion or malunion.
• Always assign an external cause code (e.g., V00-Y99) to describe the circumstances of the injury.