M31.0 vs N08
M31.0 (Hypersensitivity angiitis) compared with N08 (Glomerular disorders in diseases classified elsewhere), 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. N08 carries an Excludes1 note covering M31.0: “antiglomerular basement membrane disease (M31.0)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
No — do not report together. N08 carries an Excludes1 note covering M31.0: “Goodpasture's syndrome (M31.0)”
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
| M31.0Hypersensitivity angiitis | N08Glomerular disorders in diseases classified elsewhere | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) | N00-N99 — Diseases of the Genitourinary System (N00-N99) |
| Definition | Hypersensitivity angiitis is a billable ICD-10-CM diagnosis code (M31.0). | Glomerular disorders in diseases classified elsewhere is a billable ICD-10-CM diagnosis code (N08). |
| Includes | autoimmune disease NOS collagen (vascular) disease NOS systemic autoimmune disease systemic collagen (vascular) disease | Glomerulonephritis Nephritis Nephropathy |
| Code first | — | underlying disease, such as: amyloidosis (E85.-) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources