2027 ICD-10-CM Diagnosis Code Q20Congenital malformations of cardiac chambers and connections

ICD-10-CM Codes›Q00-Q99›Q20-Q28›Q20

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

Q20 is a non-billable ICD-10-CM category code for congenital malformations of cardiac chambers and connections, so it cannot be submitted on claims. Use a more specific code from this category instead, such as Q20.0, Q20.1, Q20.2, and Q20.3.

Code Identity

ICD-10-CM Code
Q20
Billable Status
No — Non-Billable Category
Code Describes
Congenital malformations of cardiac chambers and connections
Short Description
Congenital malformations of cardiac chambers and connections
Same as the full description in the CMS dataset.
Chapter
Q20-Q28
Congenital malformations of the circulatory system

Code Classification

ChapterQ00-Q99Congenital malformations, deformations and chromosomal abnormalities
SectionQ20-Q28Congenital malformations of the circulatory system
CategoryQ20Congenital malformations of cardiac chambers and connections
This CodeQ20Congenital malformations of cardiac chambers and connections

Specific Coding for Congenital malformations of cardiac chambers and connectionsOverview

Non-specific codes like Q20 require more characters. Use one of these billable codes instead:

  • Use Q20.0 for Common arterial trunk

  • Use Q20.1 for Double outlet right ventricle

  • Use Q20.2 for Double outlet left ventricle

  • Use Q20.3 for Discordant ventriculoarterial connection

  • Use Q20.4 for Double inlet ventricle

  • Use Q20.5 for Discordant atrioventricular connection

  • Use Q20.6 for Isomerism of atrial appendages

  • Use Q20.8 for Other congenital malformations of cardiac chambers and connections

  • Use Q20.9 for Congenital malformation of cardiac chambers and connections, unspecified

Instructional NotesGuidance

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

  • 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.

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.

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 Q20Overview

What is the ICD-10 code for congenital malformations of cardiac chambers and connections?

Q20 is the ICD-10-CM category for congenital malformations of cardiac chambers and connections, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

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

No. This is a category header that groups the codes for congenital malformations of cardiac chambers and connections, and headers cannot be submitted on claims. Claims for congenital malformations of cardiac chambers and connections need a more specific code from this category, such as Q20.0, Q20.1, and Q20.2.

Can Q20 be reported with Q89.3?

Not as a rule. The Excludes1 note on Q20 lists "dextrocardia with situs inversus (Q89.3)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).