2027 ICD-10-CM Diagnosis Code Q28.3Other malformations of cerebral vessels
ICD-10-CM Codes›Q00-Q99›Q20-Q28›Q28
- Billable — Valid for Submission
- MCC — Major Complication or Comorbidity
- POA Exempt
- Chronic Condition
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 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 91 through 93. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 8 closely related codes. 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
Code Classification
Present on Admission (POA)Billing
Q28.3 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Congenital malformations of the circulatory system (Q20-Q28).
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
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to Q28.3: its own notes plus those printed at Q28 and Chapter 17. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Congenital cerebral aneurysm (nonruptured)
- Congenital malformation of cerebral vessels NOS
- Developmental venous anomaly
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
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.
Notes
General instructions on how these codes are used.
- Codes from this chapter are not for use on maternal records
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name Q28.3, its category, or a range that includes it.
Excludes1 1
These codes carry an Excludes1 note naming Q28.3: they are not reported together with it, unless the two conditions are unrelated.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Aberrant (congenital) See Also: Malposition, congenital;
Malformation (congenital) See Also: Anomaly;
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Birth Defects
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The full article covers:
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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.
Code HistoryHistory
Questions About Q28.3Overview
What is the ICD-10 code for other malformations of cerebral vessels?
The ICD-10-CM code for other malformations of cerebral vessels is Q28.3 (sometimes written as Q283). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
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, 2026 through September 30, 2027.
What MS-DRG does Q28.3 group to?
When other malformations of cerebral vessels is the principal diagnosis on an inpatient stay, it groups to MS-DRG 91, 92, 93, with relative weights from 0.7783 to 1.7050 depending on complications. Higher weights mean higher Medicare reimbursement.
Is Q28.3 a CC or MCC?
CMS lists Q28.3 as an MCC (major complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 8 closely related codes in its exclusion list.
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. The code appears in the Congenital malformations of the circulatory system (Q20-Q28) range of the CMS exempt list.
