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

G93.9 is a billable ICD-10-CM diagnosis code for disorder of brain, unspecified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 70 through 72, 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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to G93.9: its own notes plus those printed at 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)

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

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

Clinical InformationClinical

  • Brain Disorder

    a non-neoplastic or neoplastic disorder that affects the brain.

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

Questions About G93.9Overview

What is the ICD-10 code for disorder of brain, unspecified?

The ICD-10-CM code for disorder of brain, unspecified is G93.9 (sometimes written as G939). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

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, 976, 72, 975, 70, 71, with relative weights from 0.7344 to 3.0488 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.