2027 ICD-10-CM Diagnosis Code G00Bacterial meningitis, not elsewhere classified

ICD-10-CM Codes›G00–G99›G00-G09›G00

ICD-10-CM G00
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

G00 is a non-billable ICD-10-CM category code for bacterial meningitis, not elsewhere classified, so it cannot be submitted on claims. Use a more specific code from this category instead, such as G00.0, G00.1, G00.2, and G00.3.

Code Identity

ICD-10-CM Code
G00
Billable Status
No — Non-Billable Category
Code Describes
Bacterial meningitis, not elsewhere classified
Short Description
Bacterial meningitis, not elsewhere classified
Same as the full description in the CMS dataset.
Chapter
G00-G09
Inflammatory diseases of the central nervous system

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG00-G09Inflammatory diseases of the central nervous system
CategoryG00Bacterial meningitis, not elsewhere classified
This CodeG00Bacterial meningitis, not elsewhere classified

Specific Coding for Bacterial meningitis, not elsewhere classifiedOverview

Non-specific codes like G00 require more characters. Use one of these billable codes instead:

  • Use G00.0 for Hemophilus meningitis

  • Use G00.1 for Pneumococcal meningitis

  • Use G00.2 for Streptococcal meningitis

  • Use G00.3 for Staphylococcal meningitis

  • Use G00.8 for Other bacterial meningitis

  • Use G00.9 for Bacterial meningitis, unspecified

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to G00: its own notes plus those printed at Chapter 6. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

  • bacterial arachnoiditis
  • bacterial leptomeningitis
  • bacterial meningitis
  • bacterial pachymeningitis

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

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

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 6 (G00-G99) Diseases of the nervous system applies to 700 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name G00, its category, or a range that includes it.

Notes 1

These notes mention G00.

  • G09 Sequelae of inflammatory diseases of central nervous system
    Category G09 is to be used to indicate conditions whose primary classification is to G00-G08 as the cause of sequelae, themselves classifiable elsewhere. The 'sequelae' include conditions specified as residuals.

Clinical InformationClinical

  • Meningitis, Bacterial

    bacterial infections of the leptomeninges and subarachnoid space, frequently involving the cerebral cortex, cranial nerves, cerebral blood vessels, spinal cord, and nerve roots.

Patient EducationClinical

Meningitis

Meningitis is inflammation of the thin tissue that surrounds the brain and spinal cord, called the meninges. There are several types of meningitis. The most common is viral meningitis. You get it when a virus enters the body through the nose or mouth and travels to the brain. Bacterial meningitis is rare but can be deadly.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About G00Overview

What is the ICD-10 code for bacterial meningitis, not elsewhere classified?

G00 is the ICD-10-CM category for bacterial meningitis, not elsewhere classified, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is G00 (Bacterial meningitis, not elsewhere classified) a billable code?

No. This is a category header that groups the codes for bacterial meningitis, not elsewhere classified, and headers cannot be submitted on claims. Claims for bacterial meningitis, not elsewhere classified need a more specific code from this category, such as G00.0, G00.1, and G00.2.

Can G00 be reported with G04.2?

Not as a rule. The Excludes1 note on G00 lists "bacterial meningoencephalitis (G04.2)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).