Spondylolysis, lumbosacral region

This code identifies a defect in the pars interarticularis of the vertebra, specifically located in the lumbosacral region (L5-S1). This condition represents a stress fracture or developmental defect, which can lead to instability and potentially spondylolisthesis.

Apply this code when documentation explicitly states spondylolysis affecting the lumbosacral spine. This diagnosis is often supported by imaging studies such as X-rays, CT scans, or MRIs demonstrating the pars defect. Use this code for both symptomatic and asymptomatic findings of spondylolysis in this specific spinal segment.

• Do not confuse with spondylolisthesis (M43.1-), which is the forward slippage of one vertebra over another, though spondylolysis can be a precursor.
• Ensure the documentation specifies the lumbosacral region; otherwise, a more general spondylolysis code (e.g., M43.06 for lumbar region) may be appropriate.
• If spondylolysis is associated with myelopathy or radiculopathy, additional codes for those conditions should be assigned.