2026 ICD-10-CM Diagnosis Code G93.89Other specified disorders of brain

ICD-10-CM Codes›G00–G99›G89-G99›G93

ICD-10-CM G93.89
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G93.89 is a billable ICD-10-CM diagnosis code for other specified disorders of brain. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). 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
G93.89
Billable Status
Yes — Valid for Submission
Code Describes
Other specified disorders of brain
Short Description
Other specified disorders of brain
Same as the full description in the CMS dataset.
Parent Code
G93.8
Other specified disorders of brain

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG89-G99Other disorders of the nervous system
CategoryG93Other disorders of brain
This CodeG93.89Other specified disorders of brain

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Absence of the vermis
  • Acquired ataxia
  • Acquired enlargement of ventricle of brain
  • Acquired obstructive hydrocephalus
  • Ambulatory automatism
  • Amyotrophic lateral sclerosis plus syndrome
  • Amyotrophic lateral sclerosis with cerebellar dysfunction
  • Ataxia due to subpial siderosis
  • Automatism
  • Bing-Neel syndrome
  • Borries' syndrome
  • Brain calcification Rajab type
  • Brainstem myoclonus
  • Bruns' syndrome
  • Celiac disease
  • Celiac disease with epilepsy and cerebral calcification syndrome
  • Cerebral akinetopsia
  • Cerebral calcification
  • Cerebral pseudoatrophy
  • Cerebroretinal microangiopathy with calcifications and cysts
  • Command automatism
  • Corpus callosum syndrome
  • Craniosynostosis and intracranial calcification syndrome
  • Dementia due to prion disease
  • Dementia due to progressive subcortical gliosis
  • Diabetes mellitus associated with genetic syndrome
  • Disorder of basal ganglia
  • Disorder of brain due to and following radiotherapy
  • Early delayed radiation induced brain injury
  • Encephalomalacia
  • Encephalopathy caused by ionizing radiation
  • Encephalopathy following radiation therapy
  • Encephalopathy, intracerebral calcification, retinal degeneration syndrome
  • Entrapment of inferior horn of lateral ventricle
  • Fourth ventriculomegaly
  • Hyperplasia of choroid plexus
  • Increased cerebrospinal fluid production
  • Increased cerebrospinal fluid production due to hyperplasia of choroid plexus
  • Infantile choroidocerebral calcification syndrome
  • Leukoencephalopathy with calcifications and cysts
  • Limbic disorder
  • Localized intracranial lesion
  • Localized lesion of brain
  • Mass of left frontal lobe of brain
  • Mass of left parietal lobe of brain
  • Mass of left temporal lobe
  • Mass of parietotemporal region of brain
  • Mass of right frontal lobe of brain
  • Mass of right parietal lobe of brain
  • Mass of right temporal lobe
  • Motor cortical disorder
  • Multicystic encephalomalacia
  • Necrosis of central nervous system caused by ionizing radiation
  • Neonatal brainstem dysfunction
  • Nervous system complication from surgically implanted device
  • Neural hearing loss
  • Nontraumatic injury of brain
  • Obstructive hydrocephalus
  • Obstructive hydrocephalus due to entrapment of inferior horn of lateral ventricle
  • Parkinsonism due to mass lesion of brain
  • Photomyoclonus, diabetes mellitus, deafness, nephropathy and cerebral dysfunction
  • Pneumocephalus
  • Premotor cortex syndrome
  • Progressive subcortical gliosis
  • Pseudoporencephaly
  • Rambaud Gallian syndrome
  • Retinal ischemia
  • Scar epilepsy
  • Schofer Beetz Bohl syndrome
  • Sensory somatic cortical disorder
  • Slit ventricle syndrome
  • Small vessel cerebrovascular disease
  • Snowball lesion of corpus callosum
  • Speech cortex disorder
  • Subpial siderosis
  • Superficial siderosis of central nervous system
  • Suprasellar syndrome
  • Sylvian aqueduct syndrome
  • Symmetrical thalamic calcification
  • Syringoencephalia
  • Syringoencephalomyelia
  • Tension pneumocephalus
  • Thyrocerebrorenal syndrome
  • Vasopressin resistance
  • Ventriculomegaly
  • Visual cortex dysfunction

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Postradiation encephalopathy

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.

    • Automatism
    • Calcification
      • cerebral (cortex)
    • Calcification
      • choroid plexus
    • Cicatrix(adherent) (contracted) (painful) (vicious)
      • brain
    • Congestion, congestive
      • brain
    • Deformity
      • brain (congenital)
        • acquired
    • Deformity
      • cerebral, acquired
    • Depression(acute) (mental)
      • medullary
    • Depression(acute) (mental)
      • respiratory center
    • Disease, diseased
      • brain
        • specified NEC
    • Disease, diseased
      • medullary center (idiopathic) (respiratory)
    • Dysfunction
      • cerebral
    • Encephalopathy(acute)
      • postradiation
    • Ependymopathy
    • Failure, failed
      • respiration, respiratory
        • center
    • Fistula(cutaneous)
      • brain
    • Fungus, fungous
      • cerebral
    • Gliosis(cerebral)
    • Hardening
      • brain
    • Hypertrophy, hypertrophic
      • brain
    • Induration, indurated
      • brain
    • Lesion(s) (nontraumatic)
      • motor cortex NEC
    • Paralysis, paralytic(complete) (incomplete)
      • respiratory (muscle) (system) (tract)
        • center NEC
    • Pneumatocele(lung)
      • intracranial
    • Pneumocephalus
    • Siderosis(lung)
      • brain
    • Softening
      • brain (necrotic) (progressive)
    • Stenosis, stenotic(cicatricial)
      • brain
    • Stricture
      • brain
    • Syndrome
      • Clerambault's automatism
    • Syndrome
      • midbrain NEC
    • Syndrome
      • pontine NEC
    • Syndrome
      • tegmental

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

  • Pneumocephalus

    presence of air or gas within the intracranial cavity (e.g., epidural space, subdural space, intracerebral, etc.) which may result from traumatic injuries, fistulous tract formation, erosions of the skull from neoplasms or infection, neurosurgical procedures, and other conditions.

  • Celiac Disease

    a malabsorption syndrome that is precipitated by the ingestion of foods containing gluten, such as wheat, rye, and barley. it is characterized by inflammation of the small intestine, loss of microvilli structure, failed intestinal absorption, and malnutrition.

  • Slit Ventricle Syndrome

    an intermittent and self-limiting headache disorder in individuals with cerebrospinal fluid shunts emplaced for the treatment of hydrocephalus. the symptoms of headache, vomiting, and cranial neuropathies are associated with intermittent obstruction of the shunt.

  • Automatism

    automatic, mechanical, and apparently undirected behavior which is outside of conscious control.

  • Encephalomalacia

    softening or loss of brain tissue following cerebral infarction; cerebral ischemia (see brain ischemia), infection, craniocerebral trauma, or other injury. the term is often used during gross pathologic inspection to describe blurred cortical margins and decreased consistency of brain tissue following infarction. multicystic encephalomalacia refers to the formation of multiple cystic cavities of various sizes in the cerebral cortex of neonates and infants following injury, most notably perinatal hypoxia-ischemic events. (from davis et al., textbook of neuropathology, 2nd ed, p665; j neuropathol exp neurol, 1995 mar;54(2):268-75)

  • Leukomalacia, Periventricular

    degeneration of white matter adjacent to the cerebral ventricles following cerebral hypoxia or brain ischemia in neonates. the condition primarily affects white matter in the perfusion zone between superficial and deep branches of the middle cerebral artery. clinical manifestations include vision disorders; cerebral palsy; paraplegia; seizures; and cognitive disorders. (from adams et al., principles of neurology, 6th ed, p1021; joynt, clinical neurology, 1997, ch4, pp30-1)

  • AVPR2 wt Allele|ADHR|Arginine Vasopressin Receptor 2 (Nephrogenic Diabetes Insipidus) Gene|Arginine Vasopressin Receptor 2 wt Allele|DI1|DIR|DIR3|NDI|V2R

    human avpr2 wild-type allele is located within xq28 and is approximately 5 kb in length. this allele, which encodes vasopressin v2 receptor protein, is involved in the maintenance of water homeostasis and g protein-coupled receptor signal transduction. when the function of the gene is absent, it results in nephrogenic diabetes insipidus (ndi).

  • Nephrogenic Diabetes Insipidus

    diabetes insipidus caused by insensitivity of the kidneys to antidiuretic hormone.

  • Pneumocephalus

    the presence of air or gas within the cranial cavity.

  • Cerebral Calcification

    abnormal deposits of calcium in the cerebral tissue.

  • Encephalomalacia

    localized atrophy of the brain parenchyma due to aging, hemorrhage, infarct, or inflammation.

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 G93.89 to ICD-9-CMHistory

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

ICD-9-CM
348.89 Brain conditions NEC
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 G93.89Overview

Is G93.89 (Other specified disorders of brain) a billable code?

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

What is the ICD-9 equivalent of G93.89?

Under the General Equivalence Mappings, other specified disorders of brain converts to ICD-9-CM 348.89 (brain conditions NEC). 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.