2027 ICD-10-CM Diagnosis Code Q24.5Malformation of coronary vessels

ICD-10-CM Codes›Q00-Q99›Q20-Q28›Q24

ICD-10-CM Q24.5
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

Q24.5 is a billable ICD-10-CM diagnosis code for malformation of coronary vessels. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 306 through 307. 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 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.

Q24.5 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 188 for payment year 2027.

Code Identity

ICD-10-CM Code
Q24.5
Billable Status
Yes — Valid for Submission
Code Describes
Malformation of coronary vessels
Short Description
Malformation of coronary vessels
Same as the full description in the CMS dataset.
Parent Code
Q24
Other congenital malformations of heart

Code Classification

ChapterQ00-Q99Congenital malformations, deformations and chromosomal abnormalities
SectionQ20-Q28Congenital malformations of the circulatory system
CategoryQ24Other congenital malformations of heart
This CodeQ24.5Malformation of coronary vessels

Present on Admission (POA)Billing

Q24.5 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).

Medicare Risk Adjustment (HCC)Billing

Q24.5 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model, but it maps to payment categories in the other CMS models shown below.

CMS-HCC V28 (Medicare Advantage Payment Model)
Not mapped
no payment category in the model that pays 100% of MA risk scores
Prior Model (CMS-HCC V24)
Not mapped under V24
this diagnosis newly risk-adjusts under the V28 model
Part D (RxHCC)
RxHCC 188 — Coronary Artery Disease
also risk-adjusts in the Part D prescription drug model (V08)

Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Aberrant course of left anterior descending coronary artery from right coronary artery crossing right ventricular outflow tract
  • Abnormal coronary artery course
  • Abnormal ostium of coronary artery
  • Abnormal ostium of coronary sinus
  • Abnormality of right superior vena cava
  • Aneurysm of coronary vessels
  • Anomalous communication of coronary artery
  • Anomalous coronary artery with acute angulation of less than 45 degrees relative to aorta
  • Anomalous coronary artery without acute angulation of less than 45 degrees relative to aorta
  • Anomalous coronary venous return
  • Anomalous course of coronary artery across right ventricular outflow tract
  • Anomalous course of coronary artery anterior to aorta
  • Anomalous course of coronary artery anterior to pulmonary trunk
  • Anomalous course of coronary artery anterior to pulmonary trunk and aorta
  • Anomalous course of coronary artery posterior to aorta
  • Anomalous course of coronary artery posterior to pulmonary trunk
  • Anomalous course of coronary artery posterior to pulmonary trunk and aorta
  • Anomalous course of coronary artery through infundibular septum
  • Anomalous intramural course of proximal portion of coronary artery above aortic sinus
  • Anomalous intramural course of proximal portion of coronary artery across commissure of aortic valve
  • Anomalous intramural course of proximal portion of coronary artery within aortic sinus
  • Anomalous origin of accessory coronary artery from aortic sinus
  • Anomalous origin of accessory coronary artery from pulmonary artery
  • Anomalous origin of circumflex artery from aortic sinus to right of nonfacing aortic sinus and anomalous origin of left anterior descending coronary artery and right coronary artery from aortic sinus to left of nonfacing aortic sinus
  • Anomalous origin of conus artery from separate aortic sinus orifice
  • Anomalous origin of coronary arteries from anterior aortic sinus
  • Anomalous origin of coronary arteries from both aortic sinuses of bicuspid valve
  • Anomalous origin of coronary artery
  • Anomalous origin of coronary artery from aorta
  • Anomalous origin of coronary artery from aortic sinus to left of nonfacing aortic sinus
  • Anomalous origin of coronary artery from aortic sinus to right of nonfacing aortic sinus
  • Anomalous origin of coronary artery from left pulmonary artery
  • Anomalous origin of coronary artery from non-facing sinus
  • Anomalous origin of coronary artery from pulmonary arterial tree
  • Anomalous origin of coronary artery from right pulmonary artery
  • Anomalous origin of dual left anterior descending coronary arteries
  • Anomalous origin of dual left anterior descending coronary arteries from right coronary artery and left coronary artery
  • Anomalous origin of large conus artery from right coronary artery
  • Anomalous origin of left anterior descending artery and right coronary artery from aortic sinus to right of nonfacing aortic sinus and anomalous origin of circumflex artery from aortic sinus to left of nonfacing aortic sinus
  • Anomalous origin of left anterior descending artery from aortic sinus to right of nonfacing aortic sinus and anomalous origin of circumflex artery and right coronary artery from aortic sinus to left of nonfacing aortic sinus
  • Anomalous origin of left anterior descending coronary artery from pulmonary artery
  • Anomalous origin of left anterior descending coronary artery from right coronary artery aortic sinus
  • Anomalous origin of left anterior descending from right coronary artery
  • Anomalous origin of left circumflex artery from right coronary artery
  • Anomalous origin of left circumflex coronary artery from pulmonary artery
  • Anomalous origin of left circumflex coronary artery from right coronary aortic sinus
  • Anomalous origin of left coronary artery
  • Anomalous origin of left coronary artery and right coronary artery from pulmonary artery
  • Anomalous origin of left coronary artery and right coronary artery with dual orifices from aortic sinus to left of nonfacing aortic sinus
  • Anomalous origin of left coronary artery and right coronary artery with dual orifices from aortic sinus to right of nonfacing aortic sinus
  • Anomalous origin of left coronary artery from pulmonary artery
  • Anomalous origin of left coronary artery from right coronary aortic sinus
  • Anomalous origin of left coronary artery from right coronary artery
  • Anomalous origin of right coronary artery
  • Anomalous origin of right coronary artery and circumflex artery from aortic sinus to right of nonfacing aortic sinus and anomalous origin of left anterior descending artery from aortic sinus to left on nonfacing aortic sinus
  • Anomalous origin of right coronary artery from aortic sinus to right of nonfacing aortic sinus and anomalous origin of left coronary artery from aortic sinus to left of nonfacing aortic sinus
  • Anomalous origin of right coronary artery from left anterior descending coronary artery
  • Anomalous origin of right coronary artery from left circumflex coronary artery
  • Anomalous origin of right coronary artery from left coronary artery
  • Anomalous origin of right coronary artery from left coronary artery aortic sinus
  • Anomalous origin of right coronary artery from left coronary artery aortic sinus and anomalous origin of left coronary artery from right coronary artery aortic sinus
  • Anomalous origin of right coronary artery from pulmonary artery
  • Anomalous origin of single coronary artery from aortic sinus to left of nonfacing aortic sinus
  • Anomalous origin of single coronary artery from aortic sinus to right of nonfacing aortic sinus
  • Anomalous origin of single coronary artery from left coronary artery aortic sinus
  • Anomalous origin of single coronary artery from nonfacing aortic sinus
  • Anomalous origin of single coronary artery from right coronary artery aortic sinus
  • Anomalous origin of sinus node coronary artery from separate aortic sinus orifice
  • Anomalous valve of coronary sinus
  • Aortic left ventricular tunnel
  • Aortic left ventricular tunnel with right coronary artery from tunnel
  • Aortic tunnel
  • Aortopulmonary coronary arterial course
  • Atresia of systemic vein
  • Balanced coronary system
  • Calcification of coronary artery
  • Circumflex runs posterior to aorta
  • Circumflex runs posterior to pulmonary trunk
  • Common coronary artery orifice
  • Completely unroofed coronary sinus defect in left atrium
  • Congenital abnormal number of coronary ostia
  • Congenital abnormality of great veins and coronary sinus
  • Congenital abnormality of hepatic vein
  • Congenital absence of coronary artery
  • Congenital absence of coronary sinus
  • Congenital anomaly of coronary artery
  • Congenital atresia of cardiac vein
  • Congenital atresia of coronary ostium
  • Congenital atresia of left main stem coronary artery
  • Congenital atresia of right coronary artery orifice
  • Congenital coronary aneurysm
  • Congenital coronary arteriovenous fistula
  • Congenital coronary artery calcification
  • Congenital coronary artery fistula
  • Congenital coronary artery fistula to left atrium
  • Congenital coronary artery fistula to left ventricle
  • Congenital coronary artery fistula to pulmonary artery
  • Congenital coronary artery fistula to right atrium
  • Congenital coronary artery fistula to right ventricle
  • Congenital coronary artery sclerosis
  • Congenital coronary sinus stenosis
  • Congenital occlusion of coronary sinus
  • Congenital stenosis of coronary artery
  • Congenital stenosis of coronary ostium
  • Congenital stenosis of distal coronary artery
  • Congenital stricture of artery
  • Coronary artery arising from main pulmonary artery
  • Coronary artery fistula to left atrium
  • Coronary artery fistula to left ventricle
  • Coronary artery fistula to right atrium
  • Coronary artery fistula to right ventricle
  • Coronary artery orifice abnormally low
  • Coronary artery patency - finding
  • Coronary artery patent
  • Coronary artery runs between aorta and pulmonary trunk
  • Coronary orifice abnormally high
  • Coronary orifice asymmetrical
  • Coronary ostium stenosis
  • Coronary sinus defect in left atrium
  • Coronary sinus drainage cephalad to left superior caval vein
  • Coronary sinus drainage cephalad to right superior caval vein
  • Coronary sinus orifice atresia
  • Coronary sinus to left ventricle fistula
  • Coronary stricture
  • Diverticulum of coronary sinus
  • Double barrel dual coronary artery orifices within aortic sinus
  • Dual coronary orifice
  • Fistula of coronary sinus
  • Hepatic vein to coronary sinus
  • Interruption of coronary artery
  • Intramural coronary artery course
  • Left dominant coronary system
  • Malposition of coronary artery orifice
  • Obstruction of coronary sinus
  • Occlusion of coronary sinus
  • Right dominant coronary system
  • Right superior caval vein connecting to coronary sinus
  • Single coronary artery
  • Single coronary artery dividing into right coronary artery and left coronary artery
  • Single left coronary artery supplying all of heart with usual distribution of right coronary artery derived from distal left coronary artery
  • Single right coronary artery supplying all of heart with usual distribution of left coronary artery derived from distal right coronary artery
  • Stricture of artery
  • Systemic to coronary collateral artery
  • Systemic to pulmonary collateral artery from coronary artery
  • Truncal arteriovenous fistula
  • Variant coronary origin from aortic sinus
  • Variant dominance of coronary circulation
  • Venous valvular anomaly
  • Widely spaced right coronary artery and left coronary artery orifices within single aortic sinus

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to Q24.5: its own notes plus those printed at Q24 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 coronary (artery) aneurysm

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From Q24 Other congenital malformations of heart applies to 9 codes
  • endocardial fibroelastosis (I42.4)

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.

From Chapter 17 (Q00-QA1) Congenital malformations, deformations and chromosomal abnormalities applies to 900 codes
  • inborn errors of metabolism (E70-E88)

Notes

General instructions on how these codes are used.

From Chapter 17 (Q00-QA1) Congenital malformations, deformations and chromosomal abnormalities applies to 900 codes
  • 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 Q24.5, its category, or a range that includes it.

Excludes1 2

These codes carry an Excludes1 note naming Q24.5: they are not reported together with it, unless the two conditions are unrelated.

  • I25.41 Coronary artery aneurysm
    congenital coronary (artery) aneurysm (Q24.5)
  • Q28 Other congenital malformations of circulatory system
    congenital coronary aneurysm (Q24.5)

Excludes2 1

These codes carry an Excludes2 note naming Q24.5: its condition is not part of those codes, and both may be reported when the patient has both.

  • Q27 Other congenital malformations of peripheral vascular system
    anomalies of coronary vessels (Q24.5)

Use Additional Code 1

These codes say to use an additional code from the note, and Q24.5 is one of the codes named.

  • Q87.88 CTNNB1 syndrome
    congenital heart malformations (Q20.0-Q24.9) names Q20.0-Q24.9, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

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

Patient EducationClinical

Congenital Heart Defects

Congenital heart defects (CHDs) are problems with the structure of the heart. "Congenital" means that that the problems are present at birth. These defects happen when a fetus's heart doesn't develop normally during pregnancy. Congenital heart defects are the most common type of birth defect.

The full article covers:

  • What are congenital heart defects?
  • What causes congenital heart defects?
  • Who is more likely to have a baby with a congenital heart defect?
  • What are the symptoms of congenital heart defects?
  • What other problems do congenital heart defects cause?
  • How are congenital heart defects diagnosed?
  • What are the treatments for congenital heart defects?

Read the full article at MedlinePlus

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

Convert Q24.5 to ICD-9-CMHistory

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

ICD-9-CM
746.85 Coronary artery 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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About Q24.5Overview

What is the ICD-10 code for malformation of coronary vessels?

The ICD-10-CM code for malformation of coronary vessels is Q24.5 (sometimes written as Q245). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is Q24.5 (Other congenital malformations of heart) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report malformation of coronary vessels on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does Q24.5 group to?

When malformation of coronary vessels is the principal diagnosis on an inpatient stay, it groups to MS-DRG 306, 307, with relative weights from 0.9146 to 1.5457 depending on complications. Higher weights mean higher Medicare reimbursement.

Is Q24.5 a CC or MCC?

CMS lists Q24.5 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 8 closely related codes in its exclusion list.

Is Q24.5 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 malformation of coronary vessels on inpatient claims. The code appears in the Congenital malformations of the circulatory system (Q20-Q28) range of the CMS exempt list.

Does Q24.5 risk-adjust for Medicare Advantage payment?

Not for Medicare Advantage: Q24.5 maps to no category in the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 188 (Coronary Artery Disease).