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

This code signifies a fracture of the fourth cervical vertebra that is not displaced and whose specific type is not documented. The "K" seventh character indicates that the patient is in a subsequent phase of care for this fracture, and the fracture has failed to heal properly, resulting in a nonunion.

Use this code when a patient presents for ongoing treatment of an unhealed, nondisplaced fracture of the C4 vertebra, and the documentation explicitly states nonunion. This applies to follow-up visits, cast changes, or evaluation for further intervention due to the lack of bone healing. Documentation should clearly state "nonunion" and specify the fourth cervical vertebra.

• Ensure documentation specifies "nonunion" for the seventh character "K"; otherwise, a different seventh character (e.g., G, P) may be appropriate.
• Verify the specific cervical vertebra involved; this code is only for the fourth cervical vertebra (C4).
• Do not use this code for initial encounters or for fractures that are healing normally.