| Type 1 Excludes |
| postpolio syndrome (G14) |
| sequelae of poliomyelitis (B91) |
| sequelae of viral encephalitis (B94.1) |
| A80 |
| Acute poliomyelitis |
| A81 |
| Atypical virus infections of central nervous system |
| A82 |
| Rabies |
| A83 |
| Mosquito-borne viral encephalitis |
| A84 |
| Tick-borne viral encephalitis |
| A85 |
| Other viral encephalitis, not elsewhere classified |
| A86 |
| Unspecified viral encephalitis |
| A87 |
| Viral meningitis |
| A88 |
| Other viral infections of central nervous system, not elsewhere classified |
| A89 |
| Unspecified viral infection of central nervous system |