Spondylolysis, multiple sites in spine

This code signifies a defect or stress fracture in the pars interarticularis, the bony segment connecting the superior and inferior articular facets of a vertebra, affecting multiple levels of the spine. It represents a structural compromise in the vertebral arch, often leading to instability and pain.

Apply this code when documentation explicitly states spondylolysis present at more than one spinal level (e.g., L3 and L5). This diagnosis is typically confirmed by imaging studies such as X-rays, CT scans, or MRIs, which identify the pars interarticularis defect.

• Ensure documentation specifies "multiple sites" or lists at least two distinct vertebral levels affected by spondylolysis.
• Do not confuse with spondylolisthesis, which involves anterior displacement of one vertebra over another.
• If the specific spinal level(s) are documented, consider using more specific codes from the M43.0- series if available for those levels.