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

This code signifies a fracture of the fourth lumbar vertebra where the specific type of fracture (e.g., compression, burst) is not documented. The patient is in a subsequent phase of treatment, and the fracture has failed to heal properly, indicating a nonunion.

This code is appropriate for follow-up encounters when a patient with a previously diagnosed, unspecified L4 vertebral fracture presents with evidence of nonunion. This would include situations where imaging confirms the lack of bone healing and the patient is undergoing continued management for this complication.

• Ensure documentation clearly states "nonunion" and specifies the fourth lumbar vertebra.
• Verify that this is a subsequent encounter, not the initial treatment for the fracture.
• Always review the full medical record to confirm the unspecified nature of the fracture.