2027 ICD-10-CM Diagnosis Code G46.8Other vascular syndromes of brain in cerebrovascular diseases
ICD-10-CM Codes›G00–G99›G40-G47›G46
- Billable — Valid for Submission
- Chronic Condition
G46.8 is a billable ICD-10-CM diagnosis code for other vascular syndromes of brain in cerebrovascular diseases. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 70 through 72. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other and ill-defined cerebrovascular disease and Other nervous system disorders (neither hereditary nor degenerative).
Code Identity
Code Classification
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to G46.8: its own notes plus those printed at G46 and 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.
- 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.
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Avellis' syndrome G46.8
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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.
Convert G46.8 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About G46.8Overview
What is the ICD-10 code for other vascular syndromes of brain in cerebrovascular diseases?
The ICD-10-CM code for other vascular syndromes of brain in cerebrovascular diseases is G46.8 (sometimes written as G468). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is G46.8 (Vascular syndromes of brain in cerebrovascular diseases) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other vascular syndromes of brain in cerebrovascular diseases on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does G46.8 group to?
When other vascular syndromes of brain in cerebrovascular diseases is the principal diagnosis on an inpatient stay, it groups to MS-DRG 72, 70, 71, with relative weights from 0.7344 to 1.6089 depending on complications. Higher weights mean higher Medicare reimbursement.
What is coded first with G46.8?
The Code First note at G46, which applies to G46.8, reads: underlying cerebrovascular disease (I60-I69). When one of these applies, it is sequenced before G46.8.
What is the ICD-9 equivalent of G46.8?
Under the General Equivalence Mappings, other vascular syndromes of brain in cerebrovascular diseases converts to ICD-9-CM 437.8 (cerebrovasc disease NEC). The mapping is approximate, so confirm the match fits the documentation.
