Skip to main content
ICD-10/Q20.8

Q20.8 ICD-10-CM Code: Other congenital malformations of cardiac chambers and connections

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Inpatient Payment Groups (MS-DRG)

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0 (FY2026), Appendix B.

  • MS-DRG 306 — CARDIAC CONGENITAL AND VALVULAR DISORDERS WITH MCC (MDC 05)
  • MS-DRG 307 — CARDIAC CONGENITAL AND VALVULAR DISORDERS WITHOUT MCC (MDC 05)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.

Official Registry Overview & Definition

Other congenital malformations of cardiac chambers and connections is a billable ICD-10-CM diagnosis code (Q20.8).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for Q20.8 in the official ICD-10-CM tabular list.

Inclusion Terms

Alternative terms the tabular list files under this code.

  • Cor binoculare

Excludes1 — Not Coded Here

Conditions that can never be reported with this code; the two are mutually exclusive.

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

Nearest Codes in This Family

Official ICD-10-CM classifications closest to Q20.8 in its code family, with their registry titles.

  • Q20 — Congenital malformations of cardiac chambers and connections
  • 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
  • Q20.9 — Congenital malformation of cardiac chambers and connections, unspecified

View all codes in the Q20 family

Indexed Clinical Terms (11)

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.

  • Anomaly, anomalous (congenital) (unspecified type), atrial, bands or folds
  • Anomaly, anomalous (congenital) (unspecified type), auricle, heart
  • Anomaly, anomalous (congenital) (unspecified type), band, atrial
  • Anomaly, anomalous (congenital) (unspecified type), cardiac, chambers, specified NEC
  • Anomaly, anomalous (congenital) (unspecified type), heart, auricle
  • Anomaly, anomalous (congenital) (unspecified type), heart, ventricle
  • Cor, biloculare
  • Cor, triloculare
  • Double, auricle (heart)
  • Malformation (congenital), cardiac, chambers, specified type NEC
  • Unilocular heart