2026 ICD-10-CM Diagnosis Code Q28.9Congenital malformation of circulatory system, unspecified

ICD-10-CM Codes›Q00-Q99›Q20-Q28›Q28

ICD-10-CM Q28.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Q28.9 is a billable ICD-10-CM diagnosis code for congenital malformation of circulatory system, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 299 through 301. 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
Q28.9
Billable Status
Yes — Valid for Submission
Code Describes
Congenital malformation of circulatory system, unspecified
Short Description
Congenital malformation of circulatory system, unspecified
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 CodeQ28.9Congenital malformation of circulatory system, unspecified

Present on Admission (POA)Billing

Q28.9 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.

  • Congenital anomaly of cardiovascular system
  • Congenital cardiovascular anomaly in mother complicating childbirth
  • Congenital cardiovascular disorder
  • Congenital cardiovascular disorder in mother complicating pregnancy, childbirth AND/OR puerperium
  • Congenital cardiovascular disorders during pregnancy, childbirth and the puerperium
  • Congenital omphalocele
  • Congenital omphalocele, diaphragmatic hernia, cardiovascular anomalies, radial ray defect syndrome
  • Congenital umbilical hernia
  • Congenital vascular disorder
  • Heart disease in mother complicating pregnancy, childbirth AND/OR puerperium
  • Impaired circulatory system function
  • Neovascular angle closure glaucoma
  • Open angle glaucoma due to vascular disorder
  • Vascular disorder

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.

    • Agenesis
      • circulatory system, part NOS
    • Anomaly, anomalous(congenital) (unspecified type)
      • circulatory system
    • Circulation
      • defective (lower extremity)
        • congenital
    • Circulation
      • embryonic
    • Circulation
      • heart, incomplete
    • Defect, defective
      • circulation
        • congenital
    • Defect, defective
      • circulation
        • newborn
    • Deformity
      • cardiovascular system, congenital
    • Disease, diseased
      • cardiovascular (atherosclerotic)
        • congenital
    • Embryonic
      • circulation
    • Embryonic
      • heart
    • Malformation(congenital)
      • circulatory system

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

  • Congenital Cardiovascular Abnormality|Congenital Abnormality of the Circulatory System|Congenital Anomaly of Cardiovascular System|Congenital Cardiovascular Anomaly|Congenital Cardiovascular Disorder

    a heart or vascular abnormality which is inborn or present at birth.

  • Congenital Cardiovascular Disorder

    a heart defect which is inborn or present at birth.

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 Q28.9 to ICD-9-CMHistory

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

ICD-9-CM
747.9 Circulatory anomaly NOS
Exact Match The mapping is direct, with no qualifiers.

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 Q28.9Overview

Is Q28.9 (Other congenital malformations of circulatory system) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report congenital malformation of circulatory system, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does Q28.9 group to?

When congenital malformation of circulatory system, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 299, 300, 301, with relative weights from 0.7197 to 1.6327 depending on complications. Higher weights mean higher Medicare reimbursement.

Is Q28.9 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 congenital malformation of circulatory system, unspecified on inpatient claims.

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

Under the General Equivalence Mappings, congenital malformation of circulatory system, unspecified converts to ICD-9-CM 747.9 (circulatory anomaly NOS). The mapping is a direct match.

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.