Unsp fx lower end of r tibia, subs for clos fx w nonunion

This code indicates a fracture of the lower end of the right tibia, where the specific type of fracture (e.g., transverse, oblique) is not documented. The patient is in a subsequent phase of care for a closed fracture that has failed to heal properly, resulting in nonunion.

Apply this code when documentation confirms a nonunion of an unspecified closed fracture of the distal right tibia, and the patient is receiving ongoing treatment for this condition. This is appropriate for follow-up visits, cast changes, or evaluations for further intervention related to the nonunion.

• Ensure documentation explicitly states "nonunion" for a closed fracture of the distal right tibia.
• Verify the encounter is "subsequent" and not initial care for the fracture.
• Do not use if the fracture type is specified (e.g., pilon fracture); use a more specific code.