2026 ICD-10-CM Diagnosis Code G93.9Disorder of brain, unspecified

ICD-10-CM Codes›G00–G99›G89-G99›G93

ICD-10-CM G93.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G93.9 is a billable ICD-10-CM diagnosis code for disorder of brain, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 974 through 976. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other nervous system disorders (neither hereditary nor degenerative).

Code Identity

ICD-10-CM Code
G93.9
Billable Status
Yes — Valid for Submission
Code Describes
Disorder of brain, unspecified
Short Description
Disorder of brain, unspecified
Same as the full description in the CMS dataset.
Parent Code
G93
Other disorders of brain

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG89-G99Other disorders of the nervous system
CategoryG93Other disorders of brain
This CodeG93.9Disorder of brain, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Aphasia due to brain damage
  • Cerebellar disorder
  • Cerebellar-facial-dental syndrome
  • Childhood myocerebrohepatopathy spectrum
  • Disorder of brain
  • Disorder of brain due to and following radiotherapy
  • Disorder of brain stem
  • Disorder of cerebral cortex
  • Disorder of midbrain
  • Disruptive behavior
  • Disruptive vocalization
  • Dystonia due to focal brain lesion
  • Language disorder associated with right hemisphere damage
  • Lesion of brain
  • Lesion of brainstem
  • Lesion of posterior fossa of cranial cavity
  • Memory disorder co-occurrent and due to organic brain damage
  • Organic memory impairment
  • Specific nonpsychotic mental disorders following organic brain damage
  • Vocalization

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.

    • Damage
      • brain (nontraumatic)
    • Disease, diseased
      • brain
    • Disease, diseased
      • brain
        • organic
    • Lesion(s) (nontraumatic)
      • brain

Clinical ClassificationClinical

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

CCSR NVS020
Other nervous system disorders (neither hereditary nor degenerative)
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Brain Diseases

Your brain is the control center of your body. It controls your thoughts, memory, speech, and movement. It regulates the function of many organs. It's part of your nervous system, which also includes your spinal cord and peripheral nerves. The nervous system sends signals between your brain and the rest of the body.

Read the full article at MedlinePlus

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

Convert G93.9 to ICD-9-CMHistory

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

ICD-9-CM
348.9 Brain condition 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 G93.9Overview

Is G93.9 (Other disorders of brain) a billable code?

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

What MS-DRG does G93.9 group to?

When disorder of brain, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 974, 975, 976, with relative weights from 0.8945 to 2.8860 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of G93.9?

Under the General Equivalence Mappings, disorder of brain, unspecified converts to ICD-9-CM 348.9 (brain condition NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.