Vascular syndromes of brain in cerebrovascular diseases (G46) ICD-10-CM
The G46 code range covers vascular syndromes of brain in cerebrovascular diseases with 10 ICD-10-CM diagnosis codes. 9 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Code First
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
Codes in the G46 Range 10 codes · 9 billable
- G46 Vascular syndromes of brain in cerebrovascular diseasesNon-billable
- 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
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the G46 range.
Anterior Cerebral Artery Syndrome
An uncommon stroke syndrome caused by infarction of the cerebral territories supplied by the anterior cerebral artery (ACA)and characterized by hemiparesis, dysarthria, aphasia, and limb apraxia.
Brain Stem Stroke Syndrome
A stroke syndrome caused by infarction of the brainstem. Signs and symptoms may include vertigo, ataxia, diplopia, dysarthria and an altered level of consciousness.
Cerebellar Stroke Syndrome
An uncommon stroke syndrome caused by infarction of the cerebellum. Signs and symptoms may include vertigo and incoordination.
Middle Cerebral Artery Syndrome
A common stroke syndrome caused by infarction of the cerebral territories supplied by the middle cerebral artery (MCA). As the areas of the brain perfused by the MCA are extensive, symptoms vary widely but may be characterized by hemiparesis, hemianopia, hemineglect and aphasia.
Posterior Cerebral Artery Syndrome
A stroke syndrome caused by infarction of the cerebral territories supplied by the posterior cerebral artery (PCA). Signs and symptoms may include visual field deficits, agnosia, aphasia and memory deficits.
About the G46 Code Range
These syndromes affect the brain in cerebrovascular disease. The subdivisions distinguish the named artery, the part of the brain involved in a stroke syndrome, or the type of lacunar syndrome.
G46.0, G46.1, and G46.2 identify middle, anterior, and posterior cerebral artery syndromes. G46.3 identifies a brain stem stroke syndrome; G46.4 identifies a cerebellar stroke syndrome.
The lacunar syndromes separate pure motor G46.5, pure sensory G46.6, and other types G46.7. G46.8 identifies other vascular brain syndromes in cerebrovascular disease.
Questions About This Page
How many billable codes are in the G46 range?
Of the 10 codes in this range, 9 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the G46 range classify?
The range classifies vascular syndromes of brain in cerebrovascular diseases. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
