2027 ICD-10-CM Diagnosis Code Q20.0Common arterial trunk

ICD-10-CM Codes›Q00-Q99›Q20-Q28›Q20

ICD-10-CM Q20.0
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

Q20.0 is a billable ICD-10-CM diagnosis code for common arterial trunk. 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 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 91 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.

Q20.0 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 191 for payment year 2027.

Code Identity

ICD-10-CM Code
Q20.0
Billable Status
Yes — Valid for Submission
Code Describes
Common arterial trunk
Short Description
Common arterial trunk
Same as the full description in the CMS dataset.
Parent Code
Q20
Congenital malformations of cardiac chambers and connections

Code Classification

ChapterQ00-Q99Congenital malformations, deformations and chromosomal abnormalities
SectionQ20-Q28Congenital malformations of the circulatory system
CategoryQ20Congenital malformations of cardiac chambers and connections
This CodeQ20.0Common arterial trunk

Present on Admission (POA)Billing

Q20.0 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

Q20.0 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 191 — Ventricular Septal Defect and Major Congenital Heart Disorders
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.

  • Abnormality of truncal valve cusp
  • Accessory tissue on truncal valve cusp
  • Common arterial trunk
  • Common arterial trunk and common origin of pulmonary arteries
  • Common arterial trunk and separate origin of pulmonary arteries
  • Common arterial trunk and widely separate origin of pulmonary arteries
  • Common arterial trunk with aortic dominance
  • Common arterial trunk with crossed over pulmonary arteries
  • Common arterial trunk with isolated pulmonary artery
  • Common arterial trunk with obstruction of aortic arch
  • Common arterial trunk with pulmonary arteries arising from trunk and unobstructed aortic arch
  • Common arterial trunk with pulmonary dominance
  • Common arterial trunk with pulmonary dominance and aortic coarctation
  • Common arterial trunk with pulmonary dominance and interrupted aortic arch
  • Common arterial trunk with pulmonary origin from truncal valve sinus
  • Congenital abnormality of truncal valve
  • Congenital absence of pulmonary trunk
  • Congenital malposition of pulmonary artery
  • Interrupted aortic arch
  • Obstruction of aortic arch
  • Solitary arterial trunk
  • Solitary pulmonary trunk with aortic atresia
  • Truncus arteriosus, Edwards' type IV

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to Q20.0: its own notes plus those printed at Q20 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.

  • Persistent truncus arteriosus

Excludes1

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

On Q20.0 itself
  • aortic septal defect (Q21.4)
From Q20 Congenital malformations of cardiac chambers and connections applies to 9 codes
  • dextrocardia with situs inversus (Q89.3)
  • mirror-image atrial arrangement with situs inversus (Q89.3)

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 Q20.0, its category, or a range that includes it.

Use Additional Code 1

These codes say to use an additional code from the note, and Q20.0 is one of the codes named.

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 Q20.0 to ICD-9-CMHistory

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

ICD-9-CM
745.0 Common truncus
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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About Q20.0Overview

What is the ICD-10 code for common arterial trunk?

The ICD-10-CM code for common arterial trunk is Q20.0 (sometimes written as Q200). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is Q20.0 (Congenital malformations of cardiac chambers and connections) a billable code?

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

What MS-DRG does Q20.0 group to?

When common arterial trunk 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 Q20.0 a CC or MCC?

CMS lists Q20.0 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 91 closely related codes in its exclusion list.

Is Q20.0 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 common arterial trunk on inpatient claims. The code appears in the Congenital malformations of the circulatory system (Q20-Q28) range of the CMS exempt list.

Does Q20.0 risk-adjust for Medicare Advantage payment?

Not for Medicare Advantage: Q20.0 maps to no category in the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 191 (Ventricular Septal Defect and Major Congenital Heart Disorders).