2026 ICD-10-CM Diagnosis Code I63.9Cerebral infarction, unspecified

ICD-10-CM Codes›I00–I99›I60-I69›I63

ICD-10-CM I63.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I63.9 is a billable ICD-10-CM diagnosis code for cerebral infarction, unspecified. 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 Cerebral infarction.

Code Identity

ICD-10-CM Code
I63.9
Billable Status
Yes — Valid for Submission
Code Describes
Cerebral infarction, unspecified
Short Description
Cerebral infarction, unspecified
Same as the full description in the CMS dataset.
Parent Code
I63
Cerebral infarction

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI60-I69Cerebrovascular diseases
CategoryI63Cerebral infarction
This CodeI63.9Cerebral infarction, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Autosomal recessive leukoencephalopathy, ischemic stroke, retinitis pigmentosa syndrome
  • Brainstem stroke syndrome
  • Cerebellar infarction
  • Cerebellar stroke
  • Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy
  • Cerebral infarction
  • Cerebrovascular accident
  • Cerebrovascular accident during operation on heart
  • Cerebrovascular accident following heart procedure
  • Cerebrovascular accident of basal ganglia
  • Cerebrovascular accident of brainstem
  • Cerebrovascular accident of medulla oblongata
  • Cerebrovascular accident with intracranial hemorrhage
  • Cerebrovascular disorder in the puerperium
  • Chorea due to injury of head
  • Completed stroke
  • Cryptogenic stroke
  • CVA during surgery
  • Dementia due to hemorrhagic cerebral infarction due to hypertension
  • Diffuse cerebrovascular disease
  • Epilepsy due to cerebrovascular accident
  • Extension of cerebrovascular accident
  • Hemichorea
  • Hemichorea due to cerebral infarction
  • Hemichorea due to head injury
  • Hemorrhagic cerebral infarction
  • Hemorrhagic cerebral infarction due to hypertension
  • Hemorrhagic infarction
  • Iatrogenic ischemic cerebral infarction
  • Infarction of visual cortex
  • Ischemic stroke
  • Ischemic stroke without coma
  • Ischemic stroke without residual deficits
  • Left sided cerebral hemisphere cerebrovascular accident
  • Livedo reticularis
  • Multi-infarct dementia
  • Multi-infarct dementia with delirium
  • Multi-infarct dementia with delusions
  • Multi-infarct dementia with depression
  • Multi-infarct dementia, uncomplicated
  • Nonatherosclerotic cerebrovascular accident
  • Nonparalytic stroke
  • Occlusive stroke
  • Pediatric arterial ischemic stroke
  • Posterior cerebral circulation infarction
  • Posterior inferior cerebellar artery syndrome
  • Progressing stroke
  • R.I.N.D. syndrome
  • Silent cerebral infarct
  • Sneddon syndrome
  • Stroke co-occurrent with migraine
  • Stroke in the puerperium
  • Stroke of uncertain pathology
  • Thrombotic stroke
  • White matter disorder co-occurrent and due to cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy

Tabular List NotesGuidance

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

Inclusion Terms

  • Stroke NOS

Type 2 Excludes

  • transient cerebral ischemic attacks and related syndromes G45

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.

    • Accident
      • cerebrovascular (ischemic)
    • Accident
      • cerebrovascular (ischemic)
        • aborted
    • Accident
      • craniovascular
    • Accident
      • vascular, brain
    • Deficit
      • neurologic NEC
        • ischemic
          • reversible (RIND)
    • Deficit
      • neurologic NEC
        • ischemic
          • reversible (RIND)
            • prolonged (PRIND)
    • Deficit
      • prolonged reversible ischemic neurologic (PRIND)
    • Infarct, infarction
      • cerebral (acute)
    • Infarct, infarction
      • cerebral (acute)
        • aborted
    • Infarct, infarction
      • cerebral (acute)
        • cortical
    • PRIND(Prolonged reversible ischemic neurologic deficit)
    • RIND(reversible ischemic neurologic deficit)
    • Stroke(apoplectic) (brain) (ischemic) (paralytic)
    • Stroke(apoplectic) (brain) (ischemic) (paralytic)
      • cerebrovascular (ischemic)
    • Stroke(apoplectic) (brain) (ischemic) (paralytic)
      • cryptogenic
    • Stroke(apoplectic) (brain) (ischemic) (paralytic)
      • in evolution
    • Stroke(apoplectic) (brain) (ischemic) (paralytic)
      • unspecified (NOS)

Clinical ClassificationClinical

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

CCSR CIR020
Cerebral infarction
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Cerebral Infarction

    the formation of an area of necrosis in the cerebrum caused by an insufficiency of arterial or venous blood flow. infarcts of the cerebrum are generally classified by hemisphere (i.e., left vs. right), lobe (e.g., frontal lobe infarction), arterial distribution (e.g., infarction, anterior cerebral artery), and etiology (e.g., embolic infarction).

  • Infarction, Middle Cerebral Artery

    necrosis occurring in the middle cerebral artery distribution system which brings blood to the entire lateral aspects of each cerebral hemisphere. clinical signs include impaired cognition; aphasia; agraphia; weak and numbness in the face and arms, contralaterally or bilaterally depending on the infarction.

  • Livedo Reticularis

    a condition characterized by a reticular or fishnet pattern on the skin of lower extremities and other parts of the body. this red and blue pattern is due to deoxygenated blood in unstable dermal blood vessels. the condition is intensified by cold exposure and relieved by rewarming.

  • Livedoid Vasculopathy

    a rare cutaneous thrombotic disease due to occlusion of dermal vessels. it is characterized by purpuric maculae and ulcerations especially during summer which form scars called atrophie blanche. it is more associated with other syndromes (e.g., protein c deficiency; hyperhomocysteinemia). livedo reticularis with systemic involvement and stroke is sneddon syndrome.

  • Sneddon Syndrome

    a systemic non-inflammatory arteriopathy primarily of middle-aged females characterized by the association of livedo reticularis, multiple thrombotic cerebral infarction; coronary disease, and hypertension. elevation of antiphospholipid antibody titers (see also antiphospholipid syndrome), cardiac valvulopathy, ischemic attack, transient; seizures; dementia; and chronic ischemia of the extremities may also occur. pathologic examination of affected arteries reveals non-inflammatory adventitial fibrosis, thrombosis, and changes in the media (from jablonski, dictionary of syndromes & eponymic diseases, 2d ed; adams et al., principles of neurology, 6th ed, p861; arch neurol 1997 jan;54(1):53-60). mutations in the cecr1 gene (ada2 protein, human) are associated with sneddon syndrome.

  • Thrombotic Stroke

    a type of ischemic stroke resulting from obstruction due to a blood clot formed within in a cerebral artery often associated with atherosclerosis. a stroke due to a blood clot in a cerebral vein is a venous infarction (see venous infarction, brain).

  • Ischemic Stroke

    stroke due to brain ischemia resulting in interruption or reduction of blood flow to a part of the brain. when obstruction is due to a blood clot formed within in a cerebral blood vessel it is a thrombotic stroke. when obstruction is formed elsewhere and moved to block a cerebral blood vessel (see cerebral embolism) it is referred to as embolic stroke. wake-up stroke refers to ischemic stroke occurring during sleep while cryptogenic stroke refers to ischemic stroke of unknown origin.

  • Livedo Reticularis

    a recurrent purple discoloration of the skin that does not blanche and is found in a lacy, network pattern, most often in the lower extremities. it may be aggravated by exposure to cold and is classified as idiopathic or secondary. secondary livedo reticularis may be a cutaneous manifestation of immune system disorders (e.g., lupus erythematosus, rheumatoid arthritis, cryoglobulinemia, lymphoma, etc), and hematologic disorders (polycythemia vera).

Patient EducationClinical

Ischemic Stroke

A stroke happens when there is a loss of blood flow to part of the brain. Your brain cells cannot get the oxygen and nutrients they need from blood, and they start to die within a few minutes. This can cause lasting brain damage, long-term disability, or even death.

The full article covers:

  • What is an ischemic stroke?
  • What causes an ischemic stroke?
  • What are the symptoms of ischemic stroke?
  • How is an ischemic stroke diagnosed?
  • How is an ischemic stroke treated?
  • Can an ischemic stroke be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert I63.9 to ICD-9-CMHistory

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

ICD-9-CM
434.91 Crbl art ocl NOS w infrc
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 I63.9Overview

Is I63.9 (Cerebral infarction) a billable code?

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

What is the ICD-9 equivalent of I63.9?

Under the General Equivalence Mappings, cerebral infarction, unspecified converts to ICD-9-CM 434.91 (crbl art ocl NOS w infrc). 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.