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 2027. 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
These conditions affect the brain, spinal cord, or their coverings. They include meningitis, inflammation of those coverings, and other inflammatory conditions.
The meningitis categories distinguish bacterial causes from other or unspecified causes. G00 separates bacterial meningitis by the bacterium named. G01 and G02 identify meningitis in bacterial diseases and other infectious or parasitic diseases classified elsewhere. G03 includes other causes, chronic or recurrent meningitis, and meningitis with no specified cause.
G04 groups encephalitis and myelitis, inflammation of the brain and spinal cord, by the condition named. G05 separates these conditions when they occur in diseases classified elsewhere. G06 distinguishes abscesses and granulomas inside the skull from those inside the spinal canal. G07 identifies these conditions in diseases classified elsewhere. G08 addresses inflamed veins and veins with clots inside the skull or spinal canal. G09 addresses remaining effects of central nervous system inflammation.
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 2027. 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 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
