Bent bone of left ulna, subs for opn fx type I/2 w nonunion

This code describes a left ulnar fracture that has healed improperly, resulting in a bent or deformed bone (nonunion). Specifically, it indicates that the initial injury was an open fracture of Type I or II, and the patient is now receiving care for the ongoing nonunion.

Use this code for follow-up encounters where a patient is being managed for a malunion or nonunion of a previously sustained open Type I or II fracture of the left ulna. This includes situations where the patient is undergoing further evaluation, conservative treatment, or surgical intervention to address the unhealed or improperly healed fracture.

• Verify documentation clearly states "nonunion" or "malunion" and specifies the left ulna.
• Confirm the original fracture was an open Type I or II, as this impacts the specific S52.28- subcategory.
• Ensure the encounter is for follow-up care of the nonunion, not the initial treatment of the acute fracture.