ICD-10-CM Code For Vascular Syndromes Of Brain In Cerebrovascular Diseases: Group Overview

The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group G46 includes vascular syndromes of the brain related to cerebrovascular disease, such as syndromes resulting from occlusion or stenosis of cerebral arteries and transient or permanent ischemic events. These ICD-10-CM diagnosis codes are used to document clinical scenarios involving brain vascular compromise, capturing severity, neurological deficits, and anatomic involvement relevant to this group. Accurate coding within the ICD-10-CM G46 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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ICD-10-CM G46: Vascular Syndromes Of Brain In Cerebrovascular Diseases Overview

The diagnoses in this group represent vascular syndromes of the brain associated with cerebrovascular disease, including syndromes caused by ischemia, infarction, or occlusion of cerebral blood vessels. These conditions target the central nervous system, specifically cerebral arteries and brain tissue affected by altered blood flow. Accurate coding matters for reimbursement because it documents the clinical complexity, guides appropriate claim adjudication, and supports continuity of care.

When to Use

Use a code from this group when the clinical documentation indicates a vascular syndrome of the brain attributable to cerebrovascular disease, such as arterial occlusion, ischemic event, or related transient syndromes. Select the code that best reflects the anatomical location, laterality, and acute versus chronic status as documented by the treating clinician.

ICD-10-CM Codes

9 rows

ICD-10-CM Code	Description
G46.0	Middle cerebral artery syndrome
G46.1	Anterior cerebral artery syndrome
G46.2	Posterior cerebral artery syndrome
G46.3	Brain stem stroke syndrome
G46.4	Cerebellar stroke syndrome
G46.5	Pure motor lacunar syndrome
G46.6	Pure sensory lacunar syndrome
G46.7	Other lacunar syndromes
G46.8	Other vascular syndromes of brain in cerebrovascular diseases

DRG Codes

7 rows

DRG Code	Description
061	Ischemic Stroke, Precerebral Occlusion or Transient Ischemia with Thrombolytic Agent with MCC
062	Ischemic Stroke, Precerebral Occlusion or Transient Ischemia with Thrombolytic Agent with CC
063	Ischemic Stroke, Precerebral Occlusion or Transient Ischemia with Thrombolytic Agent without CC/MCC
069	Transient Ischemia without Thrombolytic
070	Other Cerebrovascular Disorders with MCC
071	Other Cerebrovascular Disorders with CC
072	Other Cerebrovascular Disorders without CC/MCC

Typical Clinical Scenarios

An older adult presents to the emergency department with sudden-onset right-sided weakness, slurred speech, and right facial droop that began one hour prior. Neuroimaging shows an acute ischemic infarct in the distribution of the left middle cerebral artery with evidence of cortical involvement and corresponding focal neurological deficits; a vascular syndrome code from this group is assigned to describe the arterial territory syndrome causing the cerebrovascular event. Typical codes: G46.3, G46.4
A middle-aged patient with known atrial fibrillation arrives with new-onset vertigo, nausea, and ataxia that evolved over several hours; MRI demonstrates a cerebellar infarction consistent with posterior circulation ischemia. Because the presentation localizes to the vertebrobasilar system and causes brainstem/cerebellar dysfunction, a specific vascular syndrome code from this group is used to capture the posterior circulation cerebrovascular syndrome. Typical codes: G46.0, G46.1
A patient in a stroke rehabilitation unit status post left hemispheric ischemic stroke develops fluctuating consciousness and new ocular movement abnormalities; clinicians document a vascular syndrome involving brainstem structures as a complication of the original cerebrovascular event and assign a code from this group to indicate the localized vascular syndrome complicating the stroke course. Typical codes: G46.2, G46.5

Related Codes

G40-EPILEPSY-AND-RECURRENT-SEIZURES

ICD-10-CM Code For Epilepsy And Recurrent Seizures: Group Overview

G43-MIGRAINE-DISORDERS

ICD-10-CM Code For Migraine: Group Overview

G44-OTHER-HEADACHE-SYNDROMES

ICD-10-CM Code For Other Headache Syndromes: Group Overview

G45-TRANSIENT-CEREBRAL-ISCHEMIC-ATTACKS

ICD-10-CM Code For Transient Cerebral Ischemic Attacks And Related Syndromes: Group Overview

G47-SLEEP-DISORDERS

ICD-10-CM Code For Sleep Disorders: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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When to Use

ICD-10-CM Codes

9 rows

ICD-10-CM Code	Description
G46.0	Middle cerebral artery syndrome
G46.1	Anterior cerebral artery syndrome
G46.2	Posterior cerebral artery syndrome
G46.3	Brain stem stroke syndrome
G46.4	Cerebellar stroke syndrome
G46.5	Pure motor lacunar syndrome
G46.6	Pure sensory lacunar syndrome
G46.7	Other lacunar syndromes
G46.8	Other vascular syndromes of brain in cerebrovascular diseases

DRG Codes

7 rows

DRG Code	Description
061	Ischemic Stroke, Precerebral Occlusion or Transient Ischemia with Thrombolytic Agent with MCC
062	Ischemic Stroke, Precerebral Occlusion or Transient Ischemia with Thrombolytic Agent with CC
063	Ischemic Stroke, Precerebral Occlusion or Transient Ischemia with Thrombolytic Agent without CC/MCC
069	Transient Ischemia without Thrombolytic
070	Other Cerebrovascular Disorders with MCC
071	Other Cerebrovascular Disorders with CC
072	Other Cerebrovascular Disorders without CC/MCC

Typical Clinical Scenarios

An older adult presents to the emergency department with sudden-onset right-sided weakness, slurred speech, and right facial droop that began one hour prior. Neuroimaging shows an acute ischemic infarct in the distribution of the left middle cerebral artery with evidence of cortical involvement and corresponding focal neurological deficits; a vascular syndrome code from this group is assigned to describe the arterial territory syndrome causing the cerebrovascular event. Typical codes: G46.3, G46.4
A middle-aged patient with known atrial fibrillation arrives with new-onset vertigo, nausea, and ataxia that evolved over several hours; MRI demonstrates a cerebellar infarction consistent with posterior circulation ischemia. Because the presentation localizes to the vertebrobasilar system and causes brainstem/cerebellar dysfunction, a specific vascular syndrome code from this group is used to capture the posterior circulation cerebrovascular syndrome. Typical codes: G46.0, G46.1
A patient in a stroke rehabilitation unit status post left hemispheric ischemic stroke develops fluctuating consciousness and new ocular movement abnormalities; clinicians document a vascular syndrome involving brainstem structures as a complication of the original cerebrovascular event and assign a code from this group to indicate the localized vascular syndrome complicating the stroke course. Typical codes: G46.2, G46.5

Related Codes

G40-EPILEPSY-AND-RECURRENT-SEIZURES

ICD-10-CM Code For Epilepsy And Recurrent Seizures: Group Overview

G43-MIGRAINE-DISORDERS

ICD-10-CM Code For Migraine: Group Overview

G44-OTHER-HEADACHE-SYNDROMES

ICD-10-CM Code For Other Headache Syndromes: Group Overview

G45-TRANSIENT-CEREBRAL-ISCHEMIC-ATTACKS

ICD-10-CM Code For Transient Cerebral Ischemic Attacks And Related Syndromes: Group Overview

G47-SLEEP-DISORDERS

ICD-10-CM Code For Sleep Disorders: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

ICD-10-CM Code For Vascular Syndromes Of Brain In Cerebrovascular Diseases: Group Overview

Sign up for ICD-10-CM Code For Vascular Syndromes Of Brain In Cerebrovascular Diseases: Group Overview policy alerts

ICD-10-CM G46: Vascular Syndromes Of Brain In Cerebrovascular Diseases Overview

ICD-10-CM Code For Vascular Syndromes Of Brain In Cerebrovascular Diseases: Group Overview

Sign up for ICD-10-CM Code For Vascular Syndromes Of Brain In Cerebrovascular Diseases: Group Overview policy alerts

ICD-10-CM G46: Vascular Syndromes Of Brain In Cerebrovascular Diseases Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which conditions are included in ICD-10-CM code group `G46`?

How does accurate coding in `G46` affect reimbursement?

What clinical scenarios are documented using `G46` codes?

Which DRGs are related to `G46` vascular syndromes of the brain?

Why is anatomic involvement important when selecting a `G46` code?

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which conditions are included in ICD-10-CM code group `G46`?

How does accurate coding in `G46` affect reimbursement?

What clinical scenarios are documented using `G46` codes?

Which DRGs are related to `G46` vascular syndromes of the brain?

Why is anatomic involvement important when selecting a `G46` code?

References