2026 ICD-10-CM Diagnosis Code G93.5Compression of brain

ICD-10-CM Codes›G00–G99›G89-G99›G93

ICD-10-CM G93.5
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G93.5 is a billable ICD-10-CM diagnosis code for compression 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
G93.5
Billable Status
Yes — Valid for Submission
Code Describes
Compression of brain
Short Description
Compression of brain
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 CodeG93.5Compression of brain

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Brain stem compression
  • Brain stem herniation
  • Central transtentorial herniation
  • Cerebellar hernia
  • Cerebellar pressure cone
  • Cerebral herniation
  • Chiari malformation
  • Chiari malformation type I
  • Compression of brain
  • Compression of brain due to focal lesion
  • Compression of optic radiation
  • Compression of visual cortex
  • Disorder of optic radiation
  • Herniation under falx cerebri
  • Hindbrain hernia headache
  • Non-traumatic hematoma of subdural space of neuraxis
  • Nontraumatic intracranial subdural hematoma
  • Nontraumatic intracranial subdural hematoma with brain compression
  • Nontraumatic intracranial subdural hemorrhage
  • Nontraumatic subarachnoid hemorrhage with brain compression
  • Posterior fossa compression syndrome
  • Spontaneous cerebral hemorrhage with compression of brain
  • Tonsillar hernia into foramen magnum
  • Transtentorial hernia
  • Transtentorial herniation downwards
  • Transtentorial herniation upwards
  • Uncinate herniation
  • Upwards herniation of cerebellum

Tabular List NotesGuidance

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

Inclusion Terms

  • Arnold-Chiari type 1 compression of brain
  • Compression of brain (stem)
  • Herniation of brain (stem)

Type 1 Excludes

  • traumatic compression of brain S06.A

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.

    • Chiari's
      • malformation
        • type I
    • Compression
      • brain (stem)
    • Compression
      • brain (stem)
        • nontraumatic
    • Hernia, hernial(acquired) (recurrent)
      • foramen magnum
    • Herniation
      • brain (stem)
    • Herniation
      • brain (stem)
        • nontraumatic
    • Herniation
      • cerebral
    • Herniation
      • cerebral
        • nontraumatic
    • Malformation(congenital)
      • Chiari
        • Type I
    • Pressure
      • brain
    • Pressure
      • cone, tentorial
    • Syndrome
      • foramen magnum
    • Syndrome
      • posterior
        • fossa compression

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 G93.5 to ICD-9-CMHistory

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

ICD-9-CM
348.4 Compression of brain
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 G93.5Overview

Is G93.5 (Other disorders of brain) a billable code?

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

What is the ICD-9 equivalent of G93.5?

Under the General Equivalence Mappings, compression of brain converts to ICD-9-CM 348.4 (compression of brain). 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.