M51.26 diagnosis code: Other intervertebral disc displacement, lumbar region
M51.26 is an International Classification of Diseases, Tenth Revision, Clinical Modification (ICD‑10‑CM, often written as ICD 10-CM) code that classifies “Other intervertebral disc displacement, lumbar region.” It falls within the family of lumbosacral intervertebral disc disorders and is applied when a lumbar intervertebral disc is displaced because of an intervertebral annulus fibrosus defect—a failure of the disc’s connective tissue—yet the lesion does not meet classic criteria for a bulge, prolapse, or herniated disc.
Such displacement in the lumbar spine commonly compresses nerve roots, producing characteristic lumbar back pain that may radiate as lower extremity pain, weakness, or sensory changes. By specifying the lumbar rather than the thoracic region, M51.26 ensures precise documentation of this musculoskeletal system condition for both clinical management and reimbursement.

