Oth traum nondisp spondylolysis of 2nd cervcal vert, 7thK

This code describes a follow-up encounter for a patient with a traumatic, nondisplaced spondylolisthesis of the C2 vertebra, specifically when the fracture has failed to heal properly (nonunion). This indicates ongoing management for a persistent instability or incomplete bone fusion at the C2 level due to a prior injury.

Use this code for subsequent encounters when a patient is being treated for a C2 traumatic spondylolisthesis that has been documented as having a nonunion. This applies to ongoing care, such as follow-up imaging, physical therapy, or surgical planning for the nonunion. Documentation should clearly state "nonunion" of the C2 fracture.

• Ensure documentation specifies "nondisplaced" and "traumatic" spondylolisthesis of C2.
• Verify the encounter is for "subsequent" care and explicitly mentions "nonunion" of the fracture.
• Do not use this code for initial treatment or for malunion; specific codes exist for those scenarios.