Displaced avulsion fx left ischium, subs for fx w nonunion

This code describes a specific type of pelvic fracture where a fragment of bone has been pulled away from the left ischium, and the bone fragments are not properly aligned. The "nonunion" indicates that the fracture has failed to heal completely after a previous treatment attempt.

This code is appropriate for follow-up encounters with a patient who has a previously diagnosed and treated displaced avulsion fracture of the left ischium, but the fracture has not united. This would typically be used when the patient is returning for further evaluation or management of the persistent nonunion.

• Ensure documentation clearly specifies "left" ischium and "displaced avulsion" fracture type.
• The "K" seventh character mandates that this is a subsequent encounter for a fracture with documented nonunion.
• Verify that previous treatment for the fracture has occurred, as indicated by the "subsequent encounter" designation.