Q21 ICD-10-CA category: Congenital malformations of cardiac septa
Q21 isn’t a code on its own. Choose one of the 7 codes beneath it, the one the documentation supports.
Official description
Q21Congenital malformations of cardiac septa
ICD-10-CA · Canada
Codes in Q21
Q21 isn’t a code on its own. Open the code that matches what the note documents.
Notes for Q21
As CIHI prints them, with any note Q21 takes from the headings above it.
Excludes
Conditions classified elsewhere.
- Acquired cardiac septal defect (I51.0)
- Inborn errors of metabolism (E70-E90)From Chapter 17: Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
Where Q21 sits
- 1ChapterChapter 17: Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- 2Block Q20-Q28Congenital malformations of the circulatory system
- 3Category Q21Congenital malformations of cardiac septa
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
Is Q21 a valid ICD-10-CA code?
No. Q21 (Congenital malformations of cardiac septa) is a category heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 7 codes; record the one the documentation supports.
Where is Q21 in ICD-10-CA?
Q21 sits under Q20-Q28 Congenital malformations of the circulatory system, within Chapter 17: Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99).
What coding notes apply to Q21?
ICD-10-CA lists Excludes notes for Q21, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.
Codes beside Q21
View Q20-Q28Q20Congenital malformations of cardiac chambers and connectionsQ22Congenital malformations of pulmonary and tricuspid valvesQ23Congenital malformations of aortic and mitral valvesQ24Other congenital malformations of heartQ25Congenital malformations of great arteriesQ26Congenital malformations of great veinsQ27Other congenital malformations of peripheral vascular systemQ28Other congenital malformations of circulatory system