2026 ICD-10-CM Diagnosis Code G93.0Cerebral cysts

ICD-10-CM Codes›G00–G99›G89-G99›G93

ICD-10-CM G93.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G93.0 is a billable ICD-10-CM diagnosis code for cerebral cysts. 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
G93.0
Billable Status
Yes — Valid for Submission
Code Describes
Cerebral cysts
Short Description
Cerebral cysts
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 CodeG93.0Cerebral cysts

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acquired periventricular cyst
  • Acquired porencephaly
  • Acquired pseudoporencephaly
  • Arachnoid cyst
  • Arachnoid cyst of cerebellopontine angle cistern
  • Arachnoid cyst of pituitary
  • Arachnoid cyst of suprasellar meninges
  • Benign neoplasm of occipital lobe
  • Cerebellar infectious cyst
  • Cerebral arachnoid cyst
  • Cerebroretinal microangiopathy with calcifications and cysts
  • Choroid plexus cyst
  • Colloid brain cyst
  • Cyst of basal ganglia
  • Cyst of brain
  • Cyst of cerebellar structure
  • Cyst of cerebrum
  • Cyst of pineal gland
  • Cyst of posterior fossa at fourth ventricle
  • Cyst of septum pellucidum
  • Cyst of spinal meninges
  • Cyst of subependymal region
  • Dermoid cyst of brain
  • Dermoid cyst of occipital lobe
  • Enterogenous cyst
  • Ependymal cyst
  • Ependymal cyst of lateral ventricle of brain
  • Ependymal cyst of ventricle of brain
  • Epidermoid cyst of brain
  • Extradural spinal arachnoid cyst
  • Familial porencephaly
  • Germ cell tumor of the brain
  • Infection causing cyst of central nervous system
  • Infectious cyst of cerebral lobe
  • Interhemispheric cyst
  • Intracranial infectious cyst
  • Intradural spinal arachnoid cyst
  • Intraventricular arachnoid cyst
  • Lesion of posterior fossa of cranial cavity
  • Leukoencephalopathy co-occurrent with bilateral anterior temporal lobe cysts
  • Leukoencephalopathy with calcifications and cysts
  • Meningeal cyst
  • Neurenteric cyst
  • Neurenteric cyst of intracranial structure
  • Pituitary cyst
  • Porencephalic cyst
  • Posttraumatic porencephalic cyst of brain
  • Pseudoporencephaly
  • Retrocerebellar cyst
  • Small vessel cerebrovascular disease
  • Spinal arachnoid cyst
  • Traumatic arachnoid cyst
  • Traumatic cyst of leptomeninges

Tabular List NotesGuidance

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

Inclusion Terms

  • Arachnoid cyst
  • Porencephalic cyst, acquired

Type 1 Excludes

  • acquired periventricular cysts of newborn P91.1
  • congenital cerebral cysts Q04.6

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.

    • Cyst(colloid) (mucous) (simple) (retention)
      • arachnoid, brain (acquired)
    • Cyst(colloid) (mucous) (simple) (retention)
      • brain (acquired)
    • Cyst(colloid) (mucous) (simple) (retention)
      • choroid plexus
    • Cyst(colloid) (mucous) (simple) (retention)
      • corpora quadrigemina
    • Cyst(colloid) (mucous) (simple) (retention)
      • cranial meninges
    • Cyst(colloid) (mucous) (simple) (retention)
      • dura (cerebral)
    • Cyst(colloid) (mucous) (simple) (retention)
      • membrane, brain
    • Cyst(colloid) (mucous) (simple) (retention)
      • meninges (cerebral)
    • Cyst(colloid) (mucous) (simple) (retention)
      • porencephalic
        • acquired
    • Cyst(colloid) (mucous) (simple) (retention)
      • subdural (cerebral)
    • Porencephaly(congenital) (developmental) (true)
      • acquired
    • Porencephaly(congenital) (developmental) (true)
      • nondevelopmental

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

  • Porencephalic Cyst

    a congenital or acquired cystic cavity within the cerebral hemisphere.

  • Ependymal Cyst

    a fluid filled sac lined by ependymal cells.

  • Subependymal Pseudocyst|Germinolytic Cyst|Subependymal Cyst

    cerebral periventricular cyst located on the floor of the lateral cerebral ventricle, most commonly in the caudothalamic groove, and results from regression of the germinal matrix or as a sequela of a prior subependymal hemorrhage or germinal matrix infarct.

  • Spinal Arachnoid Cyst

    a spinal cord cyst that is filled with cerebrospinal fluid and is lined by an arachnoid membrane.

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 G93.0 to ICD-9-CMHistory

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

ICD-9-CM
348.0 Cerebral cysts
Exact Match The mapping is direct, with no qualifiers.

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 G93.0Overview

Is G93.0 (Other disorders of brain) a billable code?

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

What is the ICD-9 equivalent of G93.0?

Under the General Equivalence Mappings, cerebral cysts converts to ICD-9-CM 348.0 (cerebral cysts). The mapping is a direct match.

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.