2026 ICD-10-CM Diagnosis Code Q28.3Other malformations of cerebral vessels

ICD-10-CM Codes›Q00-Q99›Q20-Q28›Q28

ICD-10-CM Q28.3
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Q28.3 is a billable ICD-10-CM diagnosis code for other malformations of cerebral vessels. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Cardiac and circulatory congenital anomalies.

Code Identity

ICD-10-CM Code
Q28.3
Billable Status
Yes — Valid for Submission
Code Describes
Other malformations of cerebral vessels
Short Description
Other malformations of cerebral vessels
Same as the full description in the CMS dataset.
Parent Code
Q28
Other congenital malformations of circulatory system

Code Classification

ChapterQ00-Q99Congenital malformations, deformations and chromosomal abnormalities
SectionQ20-Q28Congenital malformations of the circulatory system
CategoryQ28Other congenital malformations of circulatory system
This CodeQ28.3Other malformations of cerebral vessels

Present on Admission (POA)Billing

Q28.3 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Aneurysm of anterior communicating artery
  • Bregeat's syndrome
  • Congenital aneurysm of anterior communicating artery
  • Congenital aneurysm of cerebral artery
  • Congenital anomaly of cerebral artery
  • Congenital anomaly of cerebrovascular system
  • Congenital duplication of anterior communicating artery
  • Congenital intracranial vascular malformation
  • Congenital malformation of dural sinus
  • Congenital stricture of artery
  • Congenital stricture of cerebral artery
  • Hypoplasia of cranial sinus
  • Persistent cerebral embryonic artery
  • Persistent embryonic hypoglossal artery
  • Persistent embryonic otic artery
  • Persistent embryonic trigeminal artery
  • Stricture of artery
  • Vein of Galen malformation

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Congenital cerebral aneurysm (nonruptured)
  • Congenital malformation of cerebral vessels NOS
  • Developmental venous anomaly

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Aberrant(congenital)
      • artery (peripheral)
        • cerebral
    • Aberrant(congenital)
      • vein (peripheral) NEC
        • cerebral
    • Absence(of) (organ or part) (complete or partial)
      • artery (congenital) (peripheral)
        • brain
    • Absence(of) (organ or part) (complete or partial)
      • vein (peripheral) congenital NEC
        • cerebral
    • Agenesis
      • artery (peripheral)
        • brain
    • Agenesis
      • vein (s) (peripheral)
        • brain
    • Aneurysm(anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)
      • brain
        • congenital
    • Aneurysm(anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)
      • cavernous sinus
        • arteriovenous (congenital) (nonruptured)
    • Aneurysm(anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)
      • circle of Willis
        • congenital
    • Aneurysm(anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)
      • congenital (peripheral)
        • brain
    • Angioma
      • venous
    • Anomaly, anomalous(congenital) (unspecified type)
      • artery (peripheral)
        • cerebral
    • Anomaly, anomalous(congenital) (unspecified type)
      • brain (multiple)
        • vessel
    • Anomaly, anomalous(congenital) (unspecified type)
      • cerebral
        • vessels
    • Anomaly, anomalous(congenital) (unspecified type)
      • vascular
        • brain
    • Anomaly, anomalous(congenital) (unspecified type)
      • vein (s) (peripheral)
        • brain
    • Anomaly, anomalous(congenital) (unspecified type)
      • vein (s) (peripheral)
        • cerebral
    • Anomaly, anomalous(congenital) (unspecified type)
      • vein (s) (peripheral)
        • developmental
    • Atresia, atretic
      • artery NEC
        • cerebral
    • Atresia, atretic
      • vascular NEC
        • cerebral
    • Hypoplasia, hypoplastic
      • artery (peripheral)
        • brain (congenital)
    • Hypoplasia, hypoplastic
      • vascular NEC peripheral
        • brain
    • Hypoplasia, hypoplastic
      • vein (s) (peripheral)
        • brain
    • Malformation(congenital)
      • cerebral
        • vessels
    • Stricture
      • artery
        • congenital (peripheral)
          • cerebral

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MAL001
Cardiac and circulatory congenital anomalies
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Vein of Galen Malformation

    an arteriovenous malformation in the vein of galen that is located at the base of the brain. the malformation may result in developmental delays, hydrocephalus, seizures, and congestive heart failure.

Patient EducationClinical

Birth Defects

A birth defect is a problem that happens while a baby is developing in the mother's body. Most birth defects happen during the first 3 months of pregnancy. One out of every 33 babies in the United States is born with a birth defect.

The full article covers:

  • What are birth defects?
  • What causes birth defects?
  • Who is at risk of having a baby with birth defects?
  • How are birth defects diagnosed?
  • What are the treatments for birth defects?
  • Can birth defects be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert Q28.3 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
747.81 Cerebrovascular anomaly
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About Q28.3Overview

Is Q28.3 (Other congenital malformations of circulatory system) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other malformations of cerebral vessels on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is Q28.3 exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for other malformations of cerebral vessels on inpatient claims.

What is the ICD-9 equivalent of Q28.3?

Under the General Equivalence Mappings, other malformations of cerebral vessels converts to ICD-9-CM 747.81 (cerebrovascular anomaly). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.