G99.2 vs M51.0
G99.2 (Myelopathy in diseases classified elsewhere) compared with M51.0 (Thoracic, thoracolumbar and lumbosacral intervertebral disc disorders with myelopathy), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. G99.2 carries an Excludes1 note covering M51.0: “intervertebral disease (M50.0-, M51.0-)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| G99.2Myelopathy in diseases classified elsewhere | M51.0Thoracic, thoracolumbar and lumbosacral intervertebral disc disorders with myelopathy | |
|---|---|---|
| Billing status | Billable | Non-billable header |
| Classification | G00-G99 — Diseases of the Nervous System (G00-G99) | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) |
| Definition | Myelopathy in diseases classified elsewhere is a billable ICD-10-CM diagnosis code (G99.2). | Thoracic, thoracolumbar and lumbosacral intervertebral disc disorders with myelopathy is a non-billable ICD-10-CM category code (M51.0). |
| Code first | underlying disease, such as: neoplasm (C00-D49) | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources