ICD-10-CM 2027 diagnosis code

G00Bacterial meningitis, not elsewhere classified

Not billable — use a more specific code

G00 is a header code, so it can't be reported by itself. Choose one of the 6 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About G00

G00 is the ICD-10-CM diagnosis code for bacterial meningitis, not elsewhere classified. It belongs to block G00-G09 (inflammatory diseases of the central nervous system) and chapter 6 (diseases of the nervous system). It is a header code, so it can't be reported by itself; one of its 6 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: G00.0 (meningitis), G00.1 (meningitis), G00.2 (meningitis), G00.3 (meningitis), G00.8 (meningitis) and G00.9 (unspecified).

Don't report G00 together with the conditions in its Excludes1 note: bacterial meningoencephalitis (G04.2) and bacterial meningomyelitis (G04.2).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under G00

Coding notes

IncludesFurther defines the content of the category

bacterial arachnoiditis
bacterial leptomeningitis
bacterial meningitis
bacterial pachymeningitis

Excludes1Not coded here — never report together with this code

bacterial meningoencephalitis (G04.2)
bacterial meningomyelitis (G04.2)

Notes that apply from higher levels

Instructions written at a parent level also apply to G00.

Broader instructions also apply from Chapter 6: Diseases of the nervous system.

Codes whose notes reference G00

G09Note

Code history

2016
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2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about G00

Is G00 billable?: No. G00 is a header code. Report one of its more specific subcodes instead.