2027 ICD-10-CM Diagnosis Code Q28.9Congenital malformation of circulatory system, unspecified
ICD-10-CM Codes›Q00-Q99›Q20-Q28›Q28
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- POA Exempt
- Chronic Condition
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 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 299 through 301. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 102 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
Q28.9 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.
- 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
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to Q28.9: 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.
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 Q28.9, its category, or a range that includes it.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
defective (lower extremity) I99.9
congenital Q28.9
embryonic Q28.9
heart, incomplete Q28.9
congenital Q28.9
newborn Q28.9
Disease, diseased See Also: Syndrome;
circulation Q28.9
heart Q28.9
Malformation (congenital) See Also: Anomaly;
circulatory system Q28.9
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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.
Code HistoryHistory
Questions About Q28.9Overview
What is the ICD-10 code for congenital malformation of circulatory system, unspecified?
The ICD-10-CM code for congenital malformation of circulatory system, unspecified is Q28.9 (sometimes written as Q289). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
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, 2026 through September 30, 2027.
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 301, 300, 299, with relative weights from 0.7132 to 1.5840 depending on complications. Higher weights mean higher Medicare reimbursement.
Is Q28.9 a CC or MCC?
CMS lists Q28.9 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 102 closely related codes in its exclusion list.
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. The code appears in the Congenital malformations of the circulatory system (Q20-Q28) range of the CMS exempt list.
