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    OpenPayerBilling CodesInflammatory diseases of the central nervous systemICD-10-CM g09-sequelae-of-central-nervous-system-inflammation
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    ICD-10-CM Code For Sequelae Of Inflammatory Diseases Of Central Nervous System: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group G09 includes diagnoses for sequelae of inflammatory diseases of the central nervous system, capturing persistent neurological deficits that follow resolved acute infections or inflammatory processes such as meningitis and encephalitis. These ICD-10-CM diagnosis codes are used to document ongoing clinical manifestations, functional impairments, or complications related to prior central nervous system inflammation, capturing disease severity and chronic organ system involvement. Accurate coding within the ICD-10-CM G09 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM G09: Sequelae Of Inflammatory Diseases Of Central Nervous System Overview

    This group represents residual neurological conditions resulting from prior inflammatory diseases of the central nervous system, such as sequelae after meningitis or encephalitis. It targets the central nervous system and describes persistent deficits or complications that remain after the acute inflammatory episode has resolved. Accurate coding is important for complete clinical documentation and for appropriate reimbursement tied to the long-term care needs of affected patients.

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    When to Use

    Use a code from this group when a patient has ongoing neurological impairments or complications that are explicitly documented as sequelae of a prior inflammatory central nervous system disease. Select the code when the current clinical problem is directly linked in the record to a previous episode of central nervous system inflammation.

    ICD-10-CM Codes

    1 rows

    ICD-10-CM CodeDescription
    G09Sequelae of inflammatory diseases of central nervous system

    DRG Codes

    3 rows

    DRG CodeDescription
    091Other Disorders of Nervous System with MCC
    092Other Disorders of Nervous System with CC
    093Other Disorders of Nervous System without CC/MCC

    Typical Clinical Scenarios

    • A middle-aged patient presents to neurology clinic months after recovering from documented bacterial meningitis; they report persistent cognitive difficulties, headaches, and focal motor weakness that developed following the acute infection. Neuroimaging shows residual scarring and clinical exam reveals persistent neurologic deficits attributable to the prior central nervous system inflammation, so a sequela diagnosis is assigned to capture the long-term effects. Typical codes: G09.
    • An elderly patient is admitted from a skilled nursing facility for worsening gait instability and urinary incontinence that began several weeks after an episode of viral encephalitis treated previously; the current evaluation attributes these new deficits to damage from the prior inflammatory event rather than a new infection. Because the symptoms represent late effects of the prior central nervous system inflammatory disease, the sequela code is used for inpatient problem listing and discharge documentation. Typical codes: G09.
    • A young adult with a history of treated central nervous system inflammatory disease presents to outpatient rehab for ongoing spasticity and cognitive impairment interfering with return to work; the rehabilitation team documents these as residual impairments secondary to the prior CNS inflammation. The residual neurologic impairments are coded as sequelae to indicate chronic complications of the earlier inflammatory process. Typical codes: G09.

    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

    G03-MENINGITIS-DUE-TO-OTHER-CAUSES

    ICD-10-CM Code For Meningitis Due To Other And Unspecified Causes: 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

    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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