ICD-10 · PDGM grouping
A80-A89 — Viral and prion infections of the central nervous system
Every ICD-10-CM code in this range and the PDGM clinical group CMS assigns to it, read from the CMS grouper crosswalk v07.2.26.
Codes in range
48
No clinical group
0
A period cannot be grouped from these.
Barred as primary
0
CMS rejects these in the primary position.
Where these codes group
42 of the 48 codes in A80-A89 group to Neuro Rehabilitation, but the range is not uniform — it spreads across 2 clinical groups. Every code here is assigned a group.
Code families in A80-A89
One page per three-character family: every code in it, whether it can lead a claim, its clinical group and comorbidity subgroup.
- A80Acute poliomyelitis7 codes
- A81Atypical virus infections of central nervous system10 codes
- A82Rabies3 codes
- A83Mosquito-borne viral encephalitis9 codes
- A84Tick-borne viral encephalitis5 codes
- A85Other viral encephalitis, not elsewhere classified4 codes
- A86Unspecified viral encephalitis1 code
- A87Viral meningitis5 codes
- A88Other viral infections of central nervous system, not elsewhere classified3 codes
- A89Unspecified viral infection of central nervous system1 code
Every code in A80-A89
Descriptions are CMS’s own, abbreviated as CMS abbreviates them.
| Code | Description | Clinical group | Primary position |
|---|---|---|---|
| A800 | Acute paralytic poliomyelitis, vaccine-associated | B | Can lead a claim |
| A801 | Acute paralytic poliomyelitis, wild virus, imported | B | Can lead a claim |
| A802 | Acute paralytic poliomyelitis, wild virus, indigenous | B | Can lead a claim |
| A8030 | Acute paralytic poliomyelitis, unspecified | B | Can lead a claim |
| A8039 | Other acute paralytic poliomyelitis | B | Can lead a claim |
| A804 | Acute nonparalytic poliomyelitis | K | Can lead a claim |
| A809 | Acute poliomyelitis, unspecified | K | Can lead a claim |
| A8100 | Creutzfeldt-Jakob disease, unspecified | B | Can lead a claim |
| A8101 | Variant Creutzfeldt-Jakob disease | B | Can lead a claim |
| A8109 | Other Creutzfeldt-Jakob disease | B | Can lead a claim |
| A811 | Subacute sclerosing panencephalitis | B | Can lead a claim |
| A812 | Progressive multifocal leukoencephalopathy | B | Can lead a claim |
| A8181 | Kuru | B | Can lead a claim |
| A8182 | Gerstmann-Straussler-Scheinker syndrome | B | Can lead a claim |
| A8183 | Fatal familial insomnia | B | Can lead a claim |
| A8189 | Other atypical virus infections of central nervous system | B | Can lead a claim |
| A819 | Atypical virus infection of central nervous system, unsp | B | Can lead a claim |
| A820 | Sylvatic rabies | K | Can lead a claim |
| A821 | Urban rabies | K | Can lead a claim |
| A829 | Rabies, unspecified | K | Can lead a claim |
| A830 | Japanese encephalitis | B | Can lead a claim |
| A831 | Western equine encephalitis | B | Can lead a claim |
| A832 | Eastern equine encephalitis | B | Can lead a claim |
| A833 | St Louis encephalitis | B | Can lead a claim |
| A834 | Australian encephalitis | B | Can lead a claim |
| A835 | California encephalitis | B | Can lead a claim |
| A836 | Rocio virus disease | B | Can lead a claim |
| A838 | Other mosquito-borne viral encephalitis | B | Can lead a claim |
| A839 | Mosquito-borne viral encephalitis, unspecified | B | Can lead a claim |
| A840 | Far Eastern tick-borne encephalitis | B | Can lead a claim |
| A841 | Central European tick-borne encephalitis | B | Can lead a claim |
| A8481 | Powassan virus disease | B | Can lead a claim |
| A8489 | Other tick-borne viral encephalitis | B | Can lead a claim, code first applies |
| A849 | Tick-borne viral encephalitis, unspecified | B | Can lead a claim |
| A850 | Enteroviral encephalitis | B | Can lead a claim |
| A851 | Adenoviral encephalitis | B | Can lead a claim |
| A852 | Arthropod-borne viral encephalitis, unspecified | B | Can lead a claim |
| A858 | Other specified viral encephalitis | B | Can lead a claim |
| A86 | Unspecified viral encephalitis | B | Can lead a claim |
| A870 | Enteroviral meningitis | B | Can lead a claim |
| A871 | Adenoviral meningitis | B | Can lead a claim |
| A872 | Lymphocytic choriomeningitis | B | Can lead a claim |
| A878 | Other viral meningitis | B | Can lead a claim |
| A879 | Viral meningitis, unspecified | B | Can lead a claim |
| A880 | Enteroviral exanthematous fever [Boston exanthem] | B | Can lead a claim |
| A881 | Epidemic vertigo | B | Can lead a claim |
| A888 | Other specified viral infections of central nervous system | K | Can lead a claim |
| A89 | Unspecified viral infection of central nervous system | B | Can lead a claim |
Source: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.
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