G55 vs M46
G55 (Nerve root and plexus compressions in diseases classified elsewhere) compared with M46 (Other inflammatory spondylopathies), 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. G55 carries an Excludes1 note covering M46: “nerve root compression (due to) (in) spondylopathies (M46.-, M48.-)”
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
| G55Nerve root and plexus compressions in diseases classified elsewhere | M46Other inflammatory spondylopathies | |
|---|---|---|
| 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 | Nerve root and plexus compressions in diseases classified elsewhere is a billable ICD-10-CM diagnosis code (G55). | Other inflammatory spondylopathies is a non-billable ICD-10-CM category code (M46). |
| 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