2026 ICD-10-CM Diagnosis Code I67.4Hypertensive encephalopathy

ICD-10-CM Codes›I00–I99›I60-I69›I67

ICD-10-CM I67.4
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I67.4 is a billable ICD-10-CM diagnosis code for hypertensive encephalopathy. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as dementia due to hypertensive encephalopathy. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Hypertension with complications and secondary hypertension and Other nervous system disorders (neither hereditary nor degenerative).

Code Identity

ICD-10-CM Code
I67.4
Billable Status
Yes — Valid for Submission
Code Describes
Hypertensive encephalopathy
Short Description
Hypertensive encephalopathy
Same as the full description in the CMS dataset.
Parent Code
I67
Other cerebrovascular diseases

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI60-I69Cerebrovascular diseases
CategoryI67Other cerebrovascular diseases
This CodeI67.4Hypertensive encephalopathy

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Dementia due to hypertensive encephalopathy
  • Dementia due to metabolic abnormality
  • Hypertensive encephalopathy

Tabular List NotesGuidance

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

Code Also

  • , if applicable, associated hypertensive conditions such as:
  • essential primary hypertension I10
  • hypertensive chronic kidney disease I12
  • hypertensive heart and chronic kidney disease I13
  • hypertensive heart disease I11

Type 2 Excludes

  • insufficiency, NOS, of precerebral arteries G45.2

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.

    • Degeneration, degenerative
      • cerebrovascular
        • due to hypertension
    • Encephalopathy(acute)
      • hypertensive
    • Hypertension, hypertensive(accelerated) (benign) (essential) (idiopathic) (malignant) (systemic)
      • encephalopathy
    • Lesion(s) (nontraumatic)
      • brain
        • vascular
          • hypertensive
    • Lesion(s) (nontraumatic)
      • cerebrovascular
        • hypertensive

Clinical ClassificationClinical

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

CCSR CIR008
Hypertension with complications and secondary hypertension
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR NVS020
Other nervous system disorders (neither hereditary nor degenerative)
Default principal diagnosis: inpatient No · outpatient No

Clinical InformationClinical

  • Hypertensive Encephalopathy

    brain dysfunction or damage resulting from sustained malignant hypertension. when blood pressure exceeds the limits of cerebral autoregulation, cerebral blood flow is impaired (brain ischemia). clinical manifestations include headache; nausea; vomiting; seizures; altered mental status (in some cases progressing to coma); papilledema; and retinal hemorrhage.

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 I67.4 to ICD-9-CMHistory

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

ICD-9-CM
437.2 Hypertens encephalopathy
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 I67.4Overview

Is I67.4 (Other cerebrovascular diseases) a billable code?

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

What is the ICD-9 equivalent of I67.4?

Under the General Equivalence Mappings, hypertensive encephalopathy converts to ICD-9-CM 437.2 (hypertens encephalopathy). 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.