Coding and coverage · ICD-10-CM

Q20 Congenital malformations of cardiac chambers and connections

Not billable (header)Chapter 17

Report one of the more specific codes below.

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Codes under this one

  • 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

Instructional notes

Chapter 17

Excludes2Not included here: the patient may have both; report both when both are present.
  • inborn errors of metabolism (E70-E88)
Notes
  • Codes from this chapter are not for use on maternal records

This code

Excludes1Not coded here: never report with this code, except when the two conditions are unrelated.
  • dextrocardia with situs inversus (Q89.3)
  • mirror-image atrial arrangement with situs inversus (Q89.3)

Chapter 17: Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1) · Q20-Q28 Congenital malformations of the circulatory system (Q20-Q28)

Source: ICD-10-CM FY 2027 code descriptions and tabular list (CMS and CDC National Center for Health Statistics), effective 2026-10-01 through 2027-09-30 · CMS ICD-10 files. HCC mapping: CMS-HCC V28, payment year 2027. As of 2026-11-04.

Coverage and payment depend on the claim details; confirm with the Medicare Administrative Contractor.