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

This code signifies a fracture of the fourth lumbar vertebra that is not healing properly, specifically during a follow-up visit after the initial injury. Nonunion indicates that the bone ends have failed to unite and heal completely. This condition often leads to persistent pain and instability.

Apply this code when a patient presents for ongoing management of a previously diagnosed fracture of the L4 vertebra, and documentation clearly states that the fracture has not healed and is considered a nonunion. This would be used for subsequent encounters, such as follow-up appointments, evaluations for surgical intervention, or ongoing conservative treatment for the nonunion.

• Ensure documentation explicitly states "nonunion" for the L4 fracture, not just delayed healing.
• Verify that this is a subsequent encounter, not the initial treatment for the fracture.
• Always code the underlying cause of the fracture if known and applicable (e.g., osteoporosis, trauma).