Inflammatory diseases of the central nervous system
44 codes in this section
About Section G00-G09
Section G00-G09 (G00-G09) covers inflammatory diseases of the central nervous system. It sits within the Diseases of the nervous system chapter (G00-G99). This section contains 44 ICD-10-CM codes, 35 billable diagnoses you can submit on a claim, and 9 non-billable header codes used to organize the hierarchy.
Codes are organized below by 3-character root. Click the root to see all subcodes underneath it, or click any individual code for full coverage data, payer policies, and linked CPT procedures.
Codes in G00-G09
Grouped by 3-character root code. Click any code for full detail.
| G00.0 | Hemophilus meningitis | Billable |
| G00.1 | Pneumococcal meningitis | Billable |
| G00.2 | Streptococcal meningitis | Billable |
| G00.3 | Staphylococcal meningitis | Billable |
| G00.8 | Other bacterial meningitis | Billable |
| G00.9 | Bacterial meningitis, unspecified | Billable |
| G03.0 | Nonpyogenic meningitis | Billable |
| G03.1 | Chronic meningitis | Billable |
| G03.2 | Benign recurrent meningitis [Mollaret] | Billable |
| G03.8 | Meningitis due to other specified causes | Billable |
| G03.9 | Meningitis, unspecified | Billable |
| G04.0 | Acute disseminated encephalitis and encephalomyelitis (ADEM) | Header |
| G04.00 | Acute disseminated encephalitis and encephalomyelitis, unspecified | Billable |
| G04.01 | Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM) | Billable |
| G04.02 | Postimmunization acute disseminated encephalitis, myelitis and encephalomyelitis | Billable |
| G04.1 | Tropical spastic paraplegia | Billable |
| G04.2 | Bacterial meningoencephalitis and meningomyelitis, not elsewhere classified | Billable |
| G04.3 | Acute necrotizing hemorrhagic encephalopathy | Header |
| G04.30 | Acute necrotizing hemorrhagic encephalopathy, unspecified | Billable |
| G04.31 | Postinfectious acute necrotizing hemorrhagic encephalopathy | Billable |
| G04.32 | Postimmunization acute necrotizing hemorrhagic encephalopathy | Billable |
| G04.39 | Other acute necrotizing hemorrhagic encephalopathy | Billable |
| G04.8 | Other encephalitis, myelitis and encephalomyelitis | Header |
| G04.81 | Other encephalitis and encephalomyelitis | Billable |
| G04.82 | Acute flaccid myelitis | Billable |
| G04.89 | Other myelitis | Billable |
| G04.9 | Encephalitis, myelitis and encephalomyelitis, unspecified | Header |
| G04.90 | Encephalitis and encephalomyelitis, unspecified | Billable |
| G04.91 | Myelitis, unspecified | Billable |
| G05.3 | Encephalitis and encephalomyelitis in diseases classified elsewhere | Billable |
| G05.4 | Myelitis in diseases classified elsewhere | Billable |
| G06.0 | Intracranial abscess and granuloma | Billable |
| G06.1 | Intraspinal abscess and granuloma | Billable |
| G06.2 | Extradural and subdural abscess, unspecified | Billable |
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
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