I77 vs M31.0
I77 (Other disorders of arteries and arterioles) compared with M31.0 (Hypersensitivity angiitis), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).
Can these codes be reported together?
Yes, when both are documented. I77 carries an Excludes2 note covering M31.0: “hypersensitivity angiitis (M31.0)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| I77Other disorders of arteries and arterioles | M31.0Hypersensitivity angiitis | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | I00-I99 — Diseases of the Circulatory System (I00-I99) | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) |
| Definition | Other disorders of arteries and arterioles is a non-billable ICD-10-CM category code (I77). | Hypersensitivity angiitis is a billable ICD-10-CM diagnosis code (M31.0). |
| Includes | — | autoimmune disease NOS collagen (vascular) disease NOS systemic autoimmune disease systemic collagen (vascular) disease |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources