2027 ICD-10-CM Diagnosis Code G46Vascular syndromes of brain in cerebrovascular diseases

ICD-10-CM Codes›G00–G99›G40-G47›G46

ICD-10-CM G46
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

G46 is a non-billable ICD-10-CM category code for vascular syndromes of brain in cerebrovascular diseases, so it cannot be submitted on claims. Use a more specific code from this category instead, such as G46.0, G46.1, G46.2, and G46.3.

Code Identity

ICD-10-CM Code
G46
Billable Status
No — Non-Billable Category
Code Describes
Vascular syndromes of brain in cerebrovascular diseases
Short Description
Vascular syndromes of brain in cerebrovascular diseases
Same as the full description in the CMS dataset.
Chapter
G40-G47
Episodic and paroxysmal disorders

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG40-G47Episodic and paroxysmal disorders
CategoryG46Vascular syndromes of brain in cerebrovascular diseases
This CodeG46Vascular syndromes of brain in cerebrovascular diseases

Specific Coding for Vascular syndromes of brain in cerebrovascular diseasesOverview

Non-specific codes like G46 require more characters. Use one of these billable codes instead:

  • Use G46.0 for Middle cerebral artery syndrome

  • Use G46.1 for Anterior cerebral artery syndrome

  • Use G46.2 for Posterior cerebral artery syndrome

  • Use G46.3 for Brain stem stroke syndrome

  • Use G46.4 for Cerebellar stroke syndrome

  • Use G46.5 for Pure motor lacunar syndrome

  • Use G46.6 for Pure sensory lacunar syndrome

  • Use G46.7 for Other lacunar syndromes

  • Use G46.8 for Other vascular syndromes of brain in cerebrovascular diseases

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to G46: its own notes plus those printed at Chapter 6. A note printed at a category, block or chapter applies to every code under it.

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 6 (G00-G99) Diseases of the nervous system applies to 700 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Code First

The underlying condition named in the note is sequenced before this code.

  • underlying cerebrovascular disease (I60-I69)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

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.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About G46Overview

What is the ICD-10 code for vascular syndromes of brain in cerebrovascular diseases?

G46 is the ICD-10-CM category for vascular syndromes of brain in cerebrovascular diseases, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is G46 (Vascular syndromes of brain in cerebrovascular diseases) a billable code?

No. This is a category header that groups the codes for vascular syndromes of brain in cerebrovascular diseases, and headers cannot be submitted on claims. Claims for vascular syndromes of brain in cerebrovascular diseases need a more specific code from this category, such as G46.0, G46.1, and G46.2.

What is coded first with G46?

The Code First note reads: underlying cerebrovascular disease (I60-I69). When one of these applies, it is sequenced before G46.