Nondisp avulsion fx unsp ilium, subs for fx w nonunion

This code signifies a follow-up encounter for a patient who previously sustained an avulsion fracture of an unspecified part of the ilium, where the bone fragments are still in their normal anatomical alignment. Crucially, this encounter addresses a complication where the fracture has failed to heal properly, resulting in a nonunion.

This code is appropriate for subsequent visits when a patient with a previously diagnosed nondisplaced avulsion fracture of the ilium is being managed for a confirmed nonunion. This includes evaluations, treatment planning, or ongoing care related to the persistent lack of healing.

• Ensure documentation clearly specifies "nonunion" as the reason for the subsequent encounter.
• Verify that the original fracture was indeed an avulsion type and nondisplaced.
• Confirm that the anatomical site is the ilium, even if unspecified to a more granular level.