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    OpenPayerBilling CodesInflammatory diseases of the central nervous systemICD-10-CM g03-meningitis-due-to-other-causes
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    ICD-10-CM Code For Meningitis Due To Other And Unspecified Causes: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group G03 includes meningitis diagnoses due to nonpyogenic, other specified, and unspecified causes affecting the meninges, such as viral, fungal, autoimmune, and idiopathic meningitis. These ICD-10-CM diagnosis codes are used to document clinical scenarios that capture disease severity, central nervous system involvement, and related complications or comorbid conditions. Accurate coding within the ICD-10-CM G03 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM G03: Meningitis Due To Other And Unspecified Causes Overview

    The ICD-10-CM G03 group includes meningitis diagnoses that are due to nonpyogenic, other specified, or unspecified causes affecting the central nervous system. These conditions target inflammation of the meninges and can result from a variety of infectious and noninfectious etiologies. Accurate coding matters for clinical communication and appropriate reimbursement because it documents disease etiology, severity, and required resource use.

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    When to Use

    Use a code from this group when clinical documentation indicates meningitis due to nonpyogenic, other specified, or unspecified causes and the type of meningitis is not classified under pyogenic categories. Select the most specific code available to reflect etiology, associated complications, and the degree of diagnostic certainty documented in the medical record.

    ICD-10-CM Codes

    5 rows

    ICD-10-CM CodeDescription
    G03.0Nonpyogenic meningitis
    G03.1Chronic meningitis
    G03.2Benign recurrent meningitis [Mollaret]
    G03.8Meningitis due to other specified causes
    G03.9Meningitis, unspecified

    DRG Codes

    7 rows

    DRG CodeDescription
    075Viral Meningitis with CC/MCC
    076Viral Meningitis without CC/MCC
    097Non-Bacterial Infection of Nervous System Except Viral Meningitis with MCC
    098Non-Bacterial Infection of Nervous System Except Viral Meningitis with CC
    099Non-Bacterial Infection of Nervous System Except Viral Meningitis without CC/MCC
    791Prematurity with Major Problems
    793Full Term Neonate with Major Problems

    Typical Clinical Scenarios

    • An adult presents to the emergency department with acute onset fever, severe headache, neck stiffness, photophobia, and altered mental status after a recent sinus infection. Lumbar puncture shows neutrophilic pleocytosis but cultures and Gram stain are negative for common bacterial pathogens, and imaging excludes brain abscess; an infectious or inflammatory meningitis of unclear etiology is suspected, so a nonbacterial meningitis code from this group is assigned. Typical codes: G03.0, G03.9
    • A hospitalized immunocompromised patient (on chemotherapy) develops progressive confusion, low-grade fever, and lymphocytic-predominant cerebrospinal fluid with positive PCR for a viral pathogen consistent with viral meningitis; the treating team documents meningitis due to a specified viral agent or other specified cause, leading to assignment of a specific code in this group. Typical codes: G03.1, G03.8
    • A patient with recent neurosurgical procedure or indwelling CNS device returns days later with fever, new meningeal signs, and CSF findings consistent with meningitis but cultures are sterile or attributed to postoperative/other unspecified causes; the diagnosis is recorded as meningitis due to other or unspecified causes as a complication/comorbidity of the recent intervention. Typical codes: G03.2, G03.9

    Related Codes

    G00-BACTERIAL-MENINGITIS-NOT-ELSEWHERE-CLASSIFIED

    ICD-10-CM Code For Bacterial Meningitis Not Elsewhere Classified: Group Overview

    G01-MENINGITIS-IN-BACTERIAL-DISEASES

    ICD-10-CM Code For Meningitis In Bacterial Diseases Classified Elsewhere: Group Overview

    G02-MENINGITIS-DUE-TO-OTHER-INFECTIONS

    ICD-10-CM Code For Meningitis In Other Infectious And Parasitic Diseases Classified Elsewhere: Group Overview

    G04-ENCEPHALITIS-MYELITIS-ENCEPHALOMYELITIS

    ICD-10-CM Code For Encephalitis, Myelitis And Encephalomyelitis: Group Overview

    G05-ENCEPHALITIS-MYELITIS-ENCEPHALOMYELITIS

    ICD-10-CM Code For Encephalitis Myelitis And Encephalomyelitis In Diseases Classified Elsewhere: Group Overview

    G06-INTRACRANIAL-AND-INTRASPINAL-ABSCESS

    ICD-10-CM Code For Intracranial And Intraspinal Abscess And Granuloma: Group Overview

    G07-INTRACRANIAL-AND-INTRASPINAL-ABSCESS

    ICD-10-CM Code For Intracranial And Intraspinal Abscess And Granuloma In Diseases Classified Elsewhere: Group Overview

    G08-INTRACRANIAL-AND-INTRASPINAL-PHLEBITIS

    ICD-10-CM Code For Intracranial And Intraspinal Phlebitis And Thrombophlebitis: Group Overview

    G09-SEQUELAE-OF-CENTRAL-NERVOUS-SYSTEM-INFLAMMATION

    ICD-10-CM Code For Sequelae Of Inflammatory Diseases Of Central Nervous System: Group Overview

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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