Get started free

Q20

Non-billable

Congenital malformations of cardiac chambers and connections

Q20 is the ICD-10-CM code for Congenital malformations of cardiac chambers and connections. It is a non-billable category code — use a more specific child code such as Q20.0 for billing.

Status
Header (non-billable)
Chapter
Q00-Q99
Subcodes
9
Edition
FY2026

Q00-Q99 Congenital malformations, deformations and chromosomal abnormalities

What this means — in plain language

MedlinePlus · NIH

What are 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 . Congenital heart defects can change the way the heart pumps blood. They may make blood…

Read more about Congenital Heart Defects at MedlinePlus ↗

Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.

Excludes1 — not coded here

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

Frequently asked questions

What is ICD-10 code Q20?
Q20 is the ICD-10-CM code for "Congenital malformations of cardiac chambers and connections". It falls under Q00-Q99 Congenital malformations, deformations and chromosomal abnormalities.
Is Q20 a billable code?
No — Q20 is a non-billable header code. Use a more specific child code (such as Q20.0) for billing.
What are the subcodes of Q20?
Q20 has 9 more specific child codes, including Q20.0, Q20.1, Q20.2.
What is excluded from Q20?
Excludes1 (not coded here): dextrocardia with situs inversus (Q89.3); mirror-image atrial arrangement with situs inversus (Q89.3).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

Look up another ICD-10 code or condition

Powered by Eleplan

Free ICD-10 lookup is just the start. Eleplan keeps the whole care plan in one place.

Diagnoses, medications, documents, appointments, and the whole care team — organized and always in sync, with Ellie, your AI care assistant, on top of it. Free to start.

Get started freeSee how Eleplan works →