2026 ICD-10-CM Diagnosis Code G06.2Extradural and subdural abscess, unspecified

ICD-10-CM Codes›G00–G99›G00-G09›G06

ICD-10-CM G06.2
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G06.2 is a billable ICD-10-CM diagnosis code for extradural and subdural abscess, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as abscess of subdural space caused by fungus. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under CNS abscess.

Code Identity

ICD-10-CM Code
G06.2
Billable Status
Yes — Valid for Submission
Code Describes
Extradural and subdural abscess, unspecified
Short Description
Extradural and subdural abscess, unspecified
Same as the full description in the CMS dataset.
Parent Code
G06
Intracranial and intraspinal abscess and granuloma

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG00-G09Inflammatory diseases of the central nervous system
CategoryG06Intracranial and intraspinal abscess and granuloma
This CodeG06.2Extradural and subdural abscess, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abscess of subdural space caused by fungus
  • Empyema of subdural space
  • Epidural abscess
  • Subdural abscess

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Abscess(connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)
      • epidural
    • Abscess(connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)
      • extradural
    • Abscess(connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)
      • meninges
    • Abscess(connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)
      • subarachnoid
    • Abscess(connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)
      • subdural

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NVS014
CNS abscess
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Epidural Abscess

    circumscribed collections of suppurative material occurring in the spinal or intracranial epidural space. the majority of epidural abscesses occur in the spinal canal and are associated with osteomyelitis of a vertebral body; analgesia, epidural; and other conditions. clinical manifestations include local and radicular pain, weakness, sensory loss, urinary incontinence, and fecal incontinence. cranial epidural abscesses are usually associated with osteomyelitis of a cranial bone, sinusitis, or otitis media. (from adams et al., principles of neurology, 6th ed, p710 and pp1240-1; j neurol neurosurg psychiatry 1998 aug;65(2):209-12)

Patient EducationClinical

Abscess

An abscess is a pocket of pus. You can get an abscess almost anywhere in your body. When an area of your body becomes infected, your body's immune system tries to fight the infection. White blood cells go to the infected area, collect within the damaged tissue, and cause inflammation. During this process, pus forms.

Read the full article at MedlinePlus

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

Convert G06.2 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
324.9 Cns abscess NOS
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About G06.2Overview

Is G06.2 (Intracranial and intraspinal abscess and granuloma) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report extradural and subdural abscess, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of G06.2?

Under the General Equivalence Mappings, extradural and subdural abscess, unspecified converts to ICD-9-CM 324.9 (cns abscess NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.