A85.2 vs A92.31
A85.2 (Arthropod-borne viral encephalitis, unspecified) compared with A92.31 (West Nile virus infection with 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. A85.2 carries an Excludes1 note covering A92.31: “West nile virus with encephalitis (A92.31)”
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
| A85.2Arthropod-borne viral encephalitis, unspecified | A92.31West Nile virus infection with 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 | Arthropod-borne viral encephalitis, unspecified is a billable ICD-10-CM diagnosis code (A85.2). | West Nile virus infection with encephalitis is a billable ICD-10-CM diagnosis code (A92.31). |
| Includes | specified viral encephalomyelitis NEC specified viral meningoencephalitis NEC | West Nile encephalitis West Nile encephalomyelitis |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources