A88 vs B91
A88 (Other viral infections of central nervous system, not elsewhere classified) compared with B91 (Sequelae of poliomyelitis), 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. A88 carries an Excludes1 note covering B91: “sequelae of poliomyelitis (B91)”
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
| A88Other viral infections of central nervous system, not elsewhere classified | B91Sequelae of poliomyelitis | |
|---|---|---|
| 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 | Other viral infections of central nervous system, not elsewhere classified is a non-billable ICD-10-CM category code (A88). | Sequelae of poliomyelitis is a billable ICD-10-CM diagnosis code (B91). |
| 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