A86 vs B94.1
A86 (Unspecified viral encephalitis) 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. A86 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
| A86Unspecified viral encephalitis | B94.1Sequelae of viral encephalitis | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | A00-B99 — Certain Infectious and Parasitic Diseases (A00-B99) | A00-B99 — Certain Infectious and Parasitic Diseases (A00-B99) |
| Definition | Unspecified viral encephalitis is a billable ICD-10-CM diagnosis code (A86). | Sequelae of viral encephalitis is a billable ICD-10-CM diagnosis code (B94.1). |
| Includes | Viral encephalomyelitis NOS Viral meningoencephalitis NOS | — |
| 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