A80 vs B94.1
A80 (Acute poliomyelitis) compared with B94.1 (Sequelae of viral encephalitis), 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. A80 carries an Excludes1 note covering B94.1: “sequelae of viral encephalitis (B94.1)”
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
| A80Acute poliomyelitis | B94.1Sequelae of viral encephalitis | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | A00-B99 — Certain Infectious and Parasitic Diseases (A00-B99) | A00-B99 — Certain Infectious and Parasitic Diseases (A00-B99) |
| Definition | Acute poliomyelitis is a non-billable ICD-10-CM category code (A80). | Sequelae of viral encephalitis is a billable ICD-10-CM diagnosis code (B94.1). |
| Code first | — | condition resulting from (sequela) the infectious or parasitic disease |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources