Bent bone of unsp ulna, subs for clos fx w delay heal

This code signifies a bent bone deformity of the ulna, where the fracture itself is closed (skin intact), and the patient is in a subsequent phase of care. The key clinical feature is that the healing process is taking longer than expected, indicating delayed union of the fracture.

Apply this code when documentation explicitly states a "bent bone" or "angulation" of the ulna following a fracture, and the patient is returning for follow-up care. This is appropriate when the fracture is not yet fully healed and the delay in healing has been identified.

• Ensure the documentation specifies "bent bone" or a similar deformity, not just a simple fracture.
• Verify that the encounter is for subsequent care and not the initial treatment of the fracture.
• Confirm the fracture is closed and that delayed healing is clearly noted by the provider.