ICD-10 · PDGM grouping
G00-G09 — Inflammatory diseases 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
35
No clinical group
8
A period cannot be grouped from these.
Barred as primary
0
CMS rejects these in the primary position.
Where these codes group
26 of the 35 codes in G00-G09 group to Neuro Rehabilitation, but the range is not uniform — it spreads across 2 clinical groups. A further 8 are assigned no clinical group at all, which means a 30-day period cannot be grouped from them.
Code families in G00-G09
One page per three-character family: every code in it, whether it can lead a claim, its clinical group and comorbidity subgroup.
- G00Bacterial meningitis, not elsewhere classified6 codes
- G01Meningitis in bacterial diseases classified elsewhere1 code
- G02Meningitis in other infectious and parasitic diseases classified elsewhere1 code
- G03Meningitis due to other and unspecified causes5 codes
- G04Encephalitis, myelitis and encephalomyelitis14 codes
- G05Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere2 codes
- G06Intracranial and intraspinal abscess and granuloma3 codes
- G07Intracranial and intraspinal abscess and granuloma in diseases classified elsewhere1 code
- G08Intracranial and intraspinal phlebitis and thrombophlebitis1 code
- G09Sequelae of inflammatory diseases of central nervous system1 code
Every code in G00-G09
Descriptions are CMS’s own, abbreviated as CMS abbreviates them.
| Code | Description | Clinical group | Primary position |
|---|---|---|---|
| G000 | Hemophilus meningitis | B | Can lead a claim |
| G001 | Pneumococcal meningitis | B | Can lead a claim |
| G002 | Streptococcal meningitis | B | Can lead a claim |
| G003 | Staphylococcal meningitis | B | Can lead a claim |
| G008 | Other bacterial meningitis | B | Can lead a claim |
| G009 | Bacterial meningitis, unspecified | B | Can lead a claim |
| G01 | Meningitis in bacterial diseases classified elsewhere | None | Cannot lead a claim |
| G02 | Meningitis in oth infec/parastc diseases classd elswhr | None | Cannot lead a claim |
| G030 | Nonpyogenic meningitis | B | Can lead a claim |
| G031 | Chronic meningitis | B | Can lead a claim |
| G032 | Benign recurrent meningitis [Mollaret] | B | Can lead a claim |
| G038 | Meningitis due to other specified causes | None | Cannot lead a claim |
| G039 | Meningitis, unspecified | None | Cannot lead a claim |
| G0400 | Acute disseminated encephalitis and encephalomyelitis, unsp | B | Can lead a claim |
| G0401 | Postinfect acute dissem encephalitis and encephalomyelitis | B | Can lead a claim |
| G0402 | Postimmun ac dissem encphlts, myelitis and encephalomyelitis | B | Can lead a claim |
| G041 | Tropical spastic paraplegia | B | Can lead a claim |
| G042 | Bacterial meningoencephalitis and meningomyelitis, NEC | B | Can lead a claim |
| G0430 | Acute necrotizing hemorrhagic encephalopathy, unspecified | B | Can lead a claim |
| G0431 | Postinfectious acute necrotizing hemorrhagic encephalopathy | B | Can lead a claim |
| G0432 | Postimmun acute necrotizing hemorrhagic encephalopathy | A | Can lead a claim |
| G0439 | Other acute necrotizing hemorrhagic encephalopathy | B | Can lead a claim |
| G0481 | Other encephalitis and encephalomyelitis | B | Can lead a claim |
| G0482 | Acute flaccid myelitis | B | Can lead a claim |
| G0489 | Other myelitis | B | Can lead a claim |
| G0490 | Encephalitis and encephalomyelitis, unspecified | B | Can lead a claim |
| G0491 | Myelitis, unspecified | B | Can lead a claim |
| G053 | Encephalitis and encephalomyelitis in diseases classd elswhr | None | Cannot lead a claim |
| G054 | Myelitis in diseases classified elsewhere | None | Cannot lead a claim |
| G060 | Intracranial abscess and granuloma | B | Can lead a claim |
| G061 | Intraspinal abscess and granuloma | B | Can lead a claim |
| G062 | Extradural and subdural abscess, unspecified | B | Can lead a claim |
| G07 | Intcrn & intraspinal abscs & granuloma in dis classd elswhr | None | Cannot lead a claim |
| G08 | Intracranial and intraspinal phlebitis and thrombophlebitis | B | Can lead a claim |
| G09 | Sequelae of inflammatory diseases of central nervous system | None | Cannot 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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