Stable burst fx fourth lum vertebra, subs for fx w nonunion

This code signifies a stable burst fracture of the fourth lumbar vertebra that has not healed properly, indicating a nonunion. The "subsequent encounter" aspect means the patient is receiving routine care during the healing phase of the fracture, but the bone fragments have failed to unite.

This code is appropriate for follow-up visits where a patient with a previously diagnosed stable L4 burst fracture is being monitored for healing, and imaging or clinical assessment confirms a nonunion. It should be used when the patient is no longer in the initial acute treatment phase but is still receiving care related to the fracture's ongoing management.

• Ensure documentation clearly states "nonunion" and specifies the fourth lumbar vertebra.
• Verify the encounter type is "subsequent" and not initial or sequela.
• Always code with an external cause code if applicable, especially for traumatic injuries.