Unsp fracture of first lum vertebra, subs for fx w nonunion

This code signifies a fracture of the first lumbar vertebra where the specific part of the vertebra fractured is not documented. Importantly, it indicates that the fracture has not healed properly and the patient is presenting for follow-up care related to this nonunion.

Apply this code when documentation confirms a nonunion of an L1 vertebral fracture, and the encounter is for ongoing management of this complication. This would include scenarios such as follow-up appointments, imaging studies to assess nonunion progression, or discussions regarding surgical intervention for the nonunion.

• Ensure the documentation explicitly states "nonunion" and that the encounter is subsequent to the initial injury.
• Verify that the fracture location is specifically the first lumbar vertebra (L1) but the exact type of fracture (e.g., compression, burst) is unspecified.
• Do not use for initial fracture treatment or for malunion; a separate code exists for malunion.