Spondylolisthesis

Acquired spondylolisthesis — forward or backward slip of one vertebra relative to an adjacent vertebra — with the affected spinal region not documented or not specified.

Acquired or degenerative anterior displacement of a vertebra in the occipito-atlanto-axial region (the craniocervical junction involving the occiput, C1 atlas, and C2 axis), classified under other deforming dorsopathies.

Forward slippage of one cervical vertebral body relative to the one below it, classified as an acquired or degenerative deforming dorsopathy of the cervical spine.

Spondylolisthesis localized to the cervicothoracic junction, where one vertebra has translated anteriorly relative to the vertebra immediately below it at the C7-T1 transition zone.

Acquired forward displacement of one thoracic vertebra over the one below it, localized to the mid-back (T1–T12) spinal region and classified as a deforming dorsopathy under ICD-10-CM category M43.1.

Spondylolisthesis localized to the thoracolumbar junction — the transitional segment where the thoracic spine meets the lumbar spine, typically at the T12-L1 level.

M43.16 identifies acquired or degenerative forward (or backward) slippage of a lumbar vertebra — distinct from congenital spondylolisthesis and from lumbosacral-level slippage coded separately at M43.17.

Anterior vertebral slippage at the lumbosacral junction, specifically the L5-S1 level, classified as an acquired or degenerative condition rather than a traumatic fracture or congenital defect.

Acquired forward displacement (slippage) of a vertebra in the sacral or sacrococcygeal spinal region, not congenital in origin and not due to acute trauma.

Forward displacement of one vertebral body over the one below it, occurring at two or more distinct spinal levels simultaneously.