Unsp traum displ spondylolysis of second cervcal vert, sqla

This code signifies a long-term complication or late effect resulting from an unspecified traumatic injury that caused a displaced forward slippage of the second cervical vertebra (C2) on the third cervical vertebra (C3). The original traumatic event is no longer the focus of treatment, but its residual effects are being addressed.

Apply this code when documenting conditions or symptoms that are a direct consequence of a previously sustained traumatic displaced spondylolisthesis of C2, and the acute phase of the injury has passed. Documentation should clearly link the current condition to the prior C2 spondylolisthesis and indicate that it is a sequela.

• Always sequence this S-code as a secondary diagnosis, following the code for the specific sequela being treated (e.g., chronic pain, neurological deficit).
• Ensure the medical record explicitly states that the condition is a "sequela" or "late effect" of the original traumatic spondylolisthesis.
• Do not use this code for acute or initial encounters for the traumatic spondylolisthesis; specific acute injury codes are used for those instances.