Oth nondisp fx of 4th cervcal vert, subs for fx w nonunion

This code signifies a non-displaced fracture of the fourth cervical vertebra (C4) that has failed to heal properly, as documented during a follow-up visit. It indicates a persistent lack of bony union at the fracture site after initial treatment.

Apply this code when a patient presents for ongoing management of a previously diagnosed C4 fracture where nonunion is confirmed. Documentation should clearly state "nonunion" and specify the fourth cervical vertebra, along with the "subsequent encounter" status.

• Ensure documentation explicitly states "nonunion" and not just delayed healing.
• Verify the specific cervical vertebra involved (C4 in this case) to avoid coding the wrong level.
• This "K" seventh character indicates a subsequent encounter for a fracture with nonunion; do not confuse it with other seventh characters for initial, routine, or sequela encounters.