U.S. ICD-10-CM · FY 2027

Q20 ICD-10-CM Code: Congenital malformations of cardiac chambers and connections

A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.

Code definition

Official description

Q20

Congenital malformations of cardiac chambers and connections

ICD-10-CM diagnosis code · United States clinical modification

Classification

Where Q20 sits

  1. 1

    Chapter 17

    Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1)

  2. 2

    Section

    Congenital malformations of the circulatory system (Q20-Q28)

  3. 3

    Category Q20

    Congenital malformations of cardiac chambers and connections

  4. 4

    Code Q20

    Congenital malformations of cardiac chambers and connections

More specific choices

Codes under Q20

Q20 is a non-billable category. Choose the child code that best matches the documented diagnosis.

Q20.0

Common arterial trunk

Q20.1

Double outlet right ventricle

Q20.2

Double outlet left ventricle

Q20.3

Discordant ventriculoarterial connection

Q20.4

Double inlet ventricle

Q20.5

Discordant atrioventricular connection

Q20.6

Isomerism of atrial appendages

Q20.8

Other congenital malformations of cardiac chambers and connections

Q20.9

Congenital malformation of cardiac chambers and connections, unspecified

Documentation details

Notes for this code

Inclusion terms

No inclusion terms are listed for Q20.

Code first

No “code first” instruction is listed for Q20.

Use additional code

No “use additional code” instruction is listed for Q20.

Excludes1

Conditions that should not be reported together with this code.

  • dextrocardia with situs inversus (Q89.3)
  • mirror-image atrial arrangement with situs inversus (Q89.3)

Excludes2

Conditions not included here that may be reported separately when present.

No Excludes2 note is listed for Q20.

Transparency

Source and release

Data release

U.S. ICD-10-CM · FY 2027

Effective date

Oct 1, 2026

Publisher

Vero Scribe Inc.

This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.

Review the CDC/NCHS ICD-10-CM source

Code-specific guidance

Frequently asked questions

What does ICD-10-CM code Q20 mean?

Q20 is the FY 2027 U.S. ICD-10-CM code for “Congenital malformations of cardiac chambers and connections.”

Is Q20 a billable or specific ICD-10-CM code?

No. Q20 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.

Where is Q20 located in ICD-10-CM?

Q20 is listed in Chapter 17, Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1), within Congenital malformations of the circulatory system (Q20-Q28) (Q20–Q28), under category Q20, Congenital malformations of cardiac chambers and connections.

What coding notes are listed for Q20?

No inclusion terms are listed for Q20 in this reference record. No code-first instruction is listed. Excludes1 notes: dextrocardia with situs inversus (Q89.3); mirror-image atrial arrangement with situs inversus (Q89.3). No Excludes2 note is listed.

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