Dislocation of C1/C2 cervical vertebrae, sequela

This code signifies a long-term complication or late effect resulting from a previous dislocation of the atlantoaxial joint (C1/C2 vertebrae). It indicates that the patient is experiencing ongoing issues directly attributable to that past injury, rather than an acute dislocation.

Apply this code when documentation explicitly states a sequela (e.g., chronic pain, instability, neurological deficits) due to a prior C1/C2 dislocation that is no longer acute. This is appropriate for follow-up encounters addressing residual problems from the original injury. The "S" seventh character indicates sequela.

• Always ensure the documentation clearly links the current condition to a past C1/C2 dislocation.
• Do not use this code for acute or current dislocations; those require codes from the S13.12- series without the "S" seventh character.
• Code any specific sequela (e.g., chronic pain, myelopathy) in addition to this code to fully describe the patient's condition.