Subluxation of C1/C2 cervical vertebrae, sequela

This code signifies a long-term complication or late effect resulting from a previous subluxation of the atlantoaxial joint (C1/C2). It indicates that the patient is experiencing ongoing symptoms or conditions directly attributable to the prior partial dislocation of these specific cervical vertebrae.

Use this code when documenting a patient presenting with residual symptoms or conditions (e.g., chronic pain, neurological deficits, instability) that are a direct consequence of a past C1/C2 subluxation. The patient's medical record should clearly link the current presentation to the historical injury, often years after the initial event.

• Always assign a "sequela" code when the condition is a late effect, not an acute injury.
• Ensure documentation specifies the C1/C2 level; other cervical subluxations have different codes.
• Code any associated current symptoms or conditions in addition to this sequela code.