Nondisplaced Type II dens fracture, subs for fx w nonunion

This code describes a specific type of fracture involving the dens (odontoid process) of the second cervical vertebra (C2), which has not healed properly and is in a subsequent phase of care. A Type II dens fracture is a break at the base of the dens, considered unstable due to its location. "Nondisplaced" indicates the bone fragments are still in their anatomical alignment.

Use this code for patients presenting for follow-up care of a previously diagnosed and treated nondisplaced Type II dens fracture that has failed to unite. Documentation should clearly state "nonunion" or "failed healing" of the fracture, along with the specific Type II classification and nondisplaced nature. This code is appropriate for ongoing management, such as monitoring, further imaging, or planning for revision surgery due to the nonunion.

• Ensure documentation explicitly states "nonunion" and the "subsequent encounter" for this specific fracture.
• Distinguish from malunion (improper healing) or delayed healing, which have different codes.
• Always sequence this code after any acute injury codes if the nonunion is being treated during the initial injury period.