| M51 | Thoracic, thoracolumbar, and lumbosacral intervertebral disc disorders | NON-BILLABLE CODE |
| M51.0 | Thoracic, thoracolumbar and lumbosacral intervertebral disc disorders with myelopathy | NON-BILLABLE CODE |
| M51.04 | Intervertebral disc disorders with myelopathy, thoracic region | BILLABLE CODE |
| M51.05 | Intervertebral disc disorders with myelopathy, thoracolumbar region | BILLABLE CODE |
| M51.06 | Intervertebral disc disorders with myelopathy, lumbar region | BILLABLE CODE |
| M51.1 | Thoracic, thoracolumbar and lumbosacral intervertebral disc disorders with radiculopathy | NON-BILLABLE CODE |
| M51.14 | Intervertebral disc disorders with radiculopathy, thoracic region | BILLABLE CODE |
| M51.15 | Intervertebral disc disorders with radiculopathy, thoracolumbar region | BILLABLE CODE |
| M51.16 | Intervertebral disc disorders with radiculopathy, lumbar region | BILLABLE CODE |
| M51.17 | Intervertebral disc disorders with radiculopathy, lumbosacral region | BILLABLE CODE |
| M51.2 | Other thoracic, thoracolumbar and lumbosacral intervertebral disc displacement | NON-BILLABLE CODE |
| M51.24 | Other intervertebral disc displacement, thoracic region | BILLABLE CODE |
| M51.25 | Other intervertebral disc displacement, thoracolumbar region | BILLABLE CODE |
| M51.26 | Other intervertebral disc displacement, lumbar region | BILLABLE CODE |
| M51.27 | Other intervertebral disc displacement, lumbosacral region | BILLABLE CODE |
| M51.3 | Other thoracic, thoracolumbar and lumbosacral intervertebral disc degeneration | NON-BILLABLE CODE |
| M51.34 | Other intervertebral disc degeneration, thoracic region | BILLABLE CODE |
| M51.35 | Other intervertebral disc degeneration, thoracolumbar region | BILLABLE CODE |
| M51.36 | Other intervertebral disc degeneration, lumbar region | BILLABLE CODE |
| M51.37 | Other intervertebral disc degeneration, lumbosacral region | BILLABLE CODE |
| M51.4 | Schmorl's nodes | NON-BILLABLE CODE |
| M51.44 | Schmorl's nodes, thoracic region | BILLABLE CODE |
| M51.45 | Schmorl's nodes, thoracolumbar region | BILLABLE CODE |
| M51.46 | Schmorl's nodes, lumbar region | BILLABLE CODE |
| M51.47 | Schmorl's nodes, lumbosacral region | BILLABLE CODE |
| M51.8 | Other thoracic, thoracolumbar and lumbosacral intervertebral disc disorders | NON-BILLABLE CODE |
| M51.85 | Other intervertebral disc disorders, thoracolumbar region | BILLABLE CODE |
| M51.86 | Other intervertebral disc disorders, lumbar region | BILLABLE CODE |
| M51.87 | Other intervertebral disc disorders, lumbosacral region | BILLABLE CODE |
| M51.9 | Unspecified thoracic, thoracolumbar and lumbosacral intervertebral disc disorder | BILLABLE CODE |
| M51.A | Other lumbar and lumbosacral annulus fibrosus disc defects | NON-BILLABLE CODE |
| M51.A0 | Intervertebral annulus fibrosus defect, lumbar region, unspecified size | BILLABLE CODE |
| M51.A1 | Intervertebral annulus fibrosus defect, small, lumbar region | BILLABLE CODE |
| M51.A2 | Intervertebral annulus fibrosus defect, large, lumbar region | BILLABLE CODE |
| M51.A3 | Intervertebral annulus fibrosus defect, lumbosacral region, unspecified size | BILLABLE CODE |
| M51.A4 | Intervertebral annulus fibrosus defect, small, lumbosacral region | BILLABLE CODE |
| M51.A5 | Intervertebral annulus fibrosus defect, large, lumbosacral region | BILLABLE CODE |
