2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 23 through 24, 94 through 96, 791, 793. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 72 closely related codes. 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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to G06.2: its own notes plus those printed at G06 and Chapter 6. A note printed at a category, block or chapter applies to every code under it.

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)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From G06 Intracranial and intraspinal abscess and granuloma applies to 3 codes
  • code (B95-B97) to identify infectious agent.

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

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name G06.2, its category, or a range that includes it.

Notes 1

These notes mention G06.2.

  • 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. names G00-G08, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

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

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

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About G06.2Overview

What is the ICD-10 code for extradural and subdural abscess, unspecified?

The ICD-10-CM code for extradural and subdural abscess, unspecified is G06.2 (sometimes written as G062). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

What MS-DRG does G06.2 group to?

When extradural and subdural abscess, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 793, 791, 24, 23, 96, 95, 94, with relative weights from 2.3173 to 5.7422 depending on complications. Higher weights mean higher Medicare reimbursement.

Is G06.2 a CC or MCC?

CMS lists G06.2 as an MCC (major complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 72 closely related codes in its exclusion list.

Does G06.2 need an additional code?

When the condition applies, yes. The Use Additional Code note at G06, which applies to G06.2, reads: code (B95-B97) to identify infectious agent.. The additional code is reported after G06.2.