Unsp fx shaft of unsp ulna, subs for clos fx w malunion

This code indicates a fracture of the shaft of the ulna, where the specific location on the shaft is not documented, and the laterality (left or right) is also unspecified. The fracture is currently undergoing treatment for a malunion, meaning the bone has healed in an incorrect anatomical position, and the fracture was initially managed as a closed injury.

Use this code when a patient presents for follow-up care of an ulnar shaft fracture that has healed improperly, and the documentation does not specify which ulna or the precise location of the fracture on the shaft. This code is appropriate for subsequent encounters where the malunion is the focus of treatment or evaluation.

• Ensure documentation clearly states "malunion" and that the encounter is "subsequent" for the fracture.
• Avoid using this code if the laterality (left/right) or specific shaft location is documented; more specific codes exist.
• Pair with an external cause code if the cause of the original fracture is relevant and documented.