Inflammatory diseases of the central nervous system (G00-G09) ICD-10-CM
The G00–G09 section covers inflammatory diseases of the central nervous system with 44 ICD-10-CM diagnosis codes, of which 35 are billable in fiscal year 2026. The section is organized into the 10 code ranges listed below.
Code Ranges in This Section 10 ranges · 44 codes
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the G00–G09 Code Range
ICD-10 codes G00-G09 cover inflammatory diseases of the central nervous system, mainly involving various types of meningitis, encephalitis, myelitis, abscesses, and their complications. These codes specifically identify infections caused by bacteria, viruses, fungi, parasites, or autoimmune processes affecting the brain, spinal cord, or their coverings.
This range includes detailed codes for bacterial meningitis such as G00.0 for Haemophilus influenzae meningitis and G00.1-G00.3 for pneumococcal, streptococcal, and staphylococcal meningitis. Other codes like G02 describe meningitis from parasitic or fungal infections, while G03 covers nonpyogenic and chronic meningitis. Encephalitis and related inflammation, including acute disseminated encephalomyelitis (ADEM) and tropical spastic paraplegia, are classified under G04. Codes G06-G07 identify intracranial and intraspinal abscesses or granulomas due to various infections. Additionally, G08 focuses on intracranial venous thrombophlebitis, and G09 notes sequelae following these inflammatory CNS disorders such as hydrocephalus or postinfectious complications. This classification aids precise coding for infectious and inflammatory central nervous system conditions, incorporating synonyms to clarify diagnoses from common terms like aseptic meningitis, fungal meningitis, or autoimmune encephalitis.
Questions About This Page
How many codes are in the G00-G09 range?
The G00-G09 range contains 44 ICD-10-CM diagnosis codes in FY 2026. 35 of them are billable, and the rest are category headers that organize the section.
What conditions does G00-G09 cover?
The range covers inflammatory diseases of the central nervous system. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
