Unsp traum nondisp spondylolysis of 2nd cervcal vert, init

This code describes a traumatic injury to the second cervical vertebra (C2), specifically a nondisplaced spondylolisthesis, where the vertebra has slipped forward but remains in its normal anatomical alignment. The "unspecified" nature indicates that the specific type of spondylolisthesis (e.g., pars interarticularis fracture) is not documented. This is an initial encounter for a closed fracture, meaning the skin is intact over the injury.

Use this code for a patient presenting with a newly diagnosed, traumatic, nondisplaced C2 spondylolisthesis where the specific anatomical defect causing the slip is not identified in the documentation. This applies to the initial treatment phase of the injury, such as emergency department visits or initial hospital admissions. Documentation should clearly state "traumatic," "nondisplaced spondylolisthesis," "C2," and "closed fracture."

• Ensure documentation specifies "nondisplaced" to differentiate from displaced spondylolisthesis.
• Verify the encounter is "initial" for this specific injury; subsequent encounters will require a different seventh character.
• Do not use if the specific type of C2 fracture (e.g., hangman's fracture) is documented; more specific codes exist.