Spondylolysis, site unspecified

This code represents a defect or stress fracture in the pars interarticularis of a vertebra, without specifying the exact vertebral level. Spondylolysis can occur unilaterally or bilaterally and is a common cause of low back pain, particularly in adolescents and athletes. It indicates a structural abnormality in the vertebral arch.

Use this code when documentation confirms spondylolysis but does not specify the affected spinal region (e.g., cervical, thoracic, lumbar, sacral). This is appropriate when imaging reports or physician notes simply state "spondylolysis" without further anatomical detail. It should be used when the site is truly unknown or not documented.

• Avoid using this code if the specific vertebral level of the spondylolysis is documented; instead, choose a more specific code from the M43.0- series.
• Always query the provider for clarification on the specific site if it's missing from the documentation and could impact code selection.
• This code does not differentiate between active fracture or a stable defect; it simply identifies the presence of spondylolysis.