2022 ICD-10-CM Diagnosis Code G03.9: Meningitis, Unspecified

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2026

  1. ICD-10-CM Codes
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  2. G00-G99
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  3. G00-G09
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  4. G03-
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  5. 2026 ICD-10-CM Diagnosis Code G03.9
2026 ICD-10-CM Diagnosis Code G03.9

Meningitis, unspecified

    2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 Billable/Specific Code
  • G03.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2026 edition of ICD-10-CM G03.9 became effective on October 1, 2025.
  • This is the American ICD-10-CM version of G03.9 - other international versions of ICD-10 G03.9 may differ.
Applicable To
  • Arachnoiditis (spinal) NOS
The following code(s) above G03.9 contain annotation back-referencesAnnotation Back-ReferencesIn this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to G03.9:
  • G00-G99 2026 ICD-10-CM Range G00-G99

    Diseases of the nervous systemType 2 Excludes
    • 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)
    Diseases of the nervous system

  • G03 ICD-10-CM Diagnosis Code G03

    Meningitis due to other and unspecified causes

      2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 Non-Billable/Non-Specific Code
    Includes
    • arachnoiditis NOS
    • leptomeningitis NOS
    • meningitis NOS
    • pachymeningitis NOS
    Type 1 Excludes
    • meningoencephalitis (G04.-)
    • meningomyelitis (G04.-)
    Meningitis due to other and unspecified causes
Approximate Synonyms
  • Arachnoiditis
  • Arachnoiditis, spinal
  • Meningitis
  • Pachymeningitis
  • Spinal arachnoiditis
Clinical Information
  • A chronic adhesive arachnoiditis in the spinal arachnoid, with root and spinal cord symptoms similar to those caused by pressure from a tumor.
  • A disorder characterized by acute inflammation of the meninges of the brain and/or spinal cord.
  • Brain infection
  • Inflammation of the coverings of the brain and/or spinal cord, which consist of the pia mater; arachnoid; and dura mater. Infections (viral, bacterial, and fungal) are the most common causes of this condition, but subarachnoid hemorrhage (hemorrhages, subarachnoid), chemical irritation (chemical meningitis), granulomatous conditions, neoplastic conditions (carcinomatous meningitis), and other inflammatory conditions may produce this syndrome. (from Joynt, Clinical Neurology, 1994, ch24, p6)
  • Inflammation of the meninges (three thin layers of tissue that cover and protect the brain and spinal cord). Meningitis is usually caused by a bacterial or viral infection, but sometimes is caused by cancer, drug allergies, or inflammatory diseases.
  • Inflammation of the meninges.
  • 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, which you get when a virus enters the body through the nose or mouth and travels to the brain. Bacterial meningitis is rare, but can be deadly. It usually starts with bacteria that cause a cold-like infection. It can block blood vessels in the brain and lead to stroke and brain damage. It can also harm other organs. pneumococcal infections and meningococcal infections can cause bacterial meningitis.anyone can get meningitis, but it is more common in people whose bodies have trouble fighting infections. Meningitis can progress rapidly. You should seek medical care quickly if you have
    • a sudden fever
    • a severe headache
    • a stiff neck
    early treatment can help prevent serious problems, including death. Vaccines can prevent some of the bacterial infections that cause meningitis. Parents of adolescents and students living in college dorms should talk to a doctor about the vaccination.
ICD-10-CM G03.9 is grouped within Diagnostic Related Group(s) (MS-DRG v43.0):
  • 097 Non-bacterial infection of nervous system except viral meningitis with mcc
  • 098 Non-bacterial infection of nervous system except viral meningitis with cc
  • 099 Non-bacterial infection of nervous system except viral meningitis without cc/mcc
  • 791 Prematurity with major problems
  • 793 Full term neonate with major problems

Convert G03.9 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
  • 2022 (effective 10/1/2021): No change
  • 2023 (effective 10/1/2022): No change
  • 2024 (effective 10/1/2023): No change
  • 2025 (effective 10/1/2024): No change
  • 2026 (effective 10/1/2025): No change

Diagnosis Index entries containing back-references to G03.9:

  • Meningitis (basal) (basic) (brain) (cerebral) (cervical) (congestive) (diffuse) (hemorrhagic) (infantile) (membranous) (metastatic) (nonspecific) (pontine) (progressive) (simple) (spinal) (subacute) (sympathetic) (toxic) G03.9

ICD-10-CM Codes Adjacent To G03.9 G00.3 Staphylococcal meningitis G00.8 Other bacterial meningitis G00.9 Bacterial meningitis, unspecified G01 Meningitis in bacterial diseases classified elsewhere G02 Meningitis in other infectious and parasitic diseases classified elsewhere G03 Meningitis due to other and unspecified causes G03.0 Nonpyogenic meningitis G03.1 Chronic meningitis G03.2 Benign recurrent meningitis [Mollaret] G03.8 Meningitis due to other specified causes G03.9 Meningitis, unspecified G04 Encephalitis, myelitis and encephalomyelitis G04.0 Acute disseminated encephalitis and encephalomyelitis (ADEM) G04.00 Acute disseminated encephalitis and encephalomyelitis, unspecified G04.01 Postinfectious acute disseminated encephalitis and encephalomyelitis (postinfectious ADEM) G04.02 Postimmunization acute disseminated encephalitis, myelitis and encephalomyelitis G04.1 Tropical spastic paraplegia G04.2 Bacterial meningoencephalitis and meningomyelitis, not elsewhere classified G04.3 Acute necrotizing hemorrhagic encephalopathy G04.30 …… unspecified G04.31 Postinfectious acute necrotizing hemorrhagic encephalopathy

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.

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