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 2026, 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
About the G46 Code Range
The ICD-10 code G46 covers vascular syndromes of the brain related to cerebrovascular diseases, which are conditions caused by problems with blood flow in the brain’s arteries. These codes specifically identify different types of brain syndromes caused by artery blockages or strokes affecting distinct vascular territories.
Codes such as G46.0 (Middle cerebral artery syndrome) and G46.1 (Anterior cerebral artery syndrome) pinpoint vascular syndromes tied to specific arteries. For example, G46.0 includes terms like malignant middle cerebral artery syndrome and middle cerebral artery occlusion, helping coders assign accurate diagnoses when conditions result in neurological deficits and strokes in the middle cerebral artery region. Similarly, G46.3 (Brain stem stroke syndrome) covers infarctions and syndromes affecting the brainstem, including recognized conditions like Millard-Gubler and Claude’s syndromes. Other codes such as pure motor lacunar syndrome (G46.5) and pure sensory lacunar syndrome (G46.6) denote smaller, localized strokes affecting motor or sensory pathways. Using these codes ensures precise documentation of various brain vascular syndromes in cerebrovascular disease cases.
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, 2025 through September 30, 2026. 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 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
