Q20.5 ICD-10-CA subcategory: Discordant atrioventricular connection
Q20.5 isn’t a code on its own. Choose one of the 2 codes beneath it, the one the documentation supports.
Official description
Q20.5Discordant atrioventricular connection
ICD-10-CA · Canada · Also written Q205
Codes in Q20.5
Q20.5 isn’t a code on its own. Open the code that matches what the note documents.
Notes for Q20.5
As CIHI prints them, with any note Q20.5 takes from the headings above it.
Excludes
Conditions classified elsewhere.
- dextrocardia, mirror-image atrial arrangement — with situs inversus (Q89.3)From Q20 Congenital malformations of cardiac chambers and connections
- Inborn errors of metabolism (E70-E90)From Chapter 17: Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
Where Q20.5 sits
- 1ChapterChapter 17: Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- 2Block Q20-Q28Congenital malformations of the circulatory system
- 3Category Q20Congenital malformations of cardiac chambers and connections
- 4Subcategory Q20.5Discordant atrioventricular connection
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 Q20.5 a valid ICD-10-CA code?
No. Q20.5 (Discordant atrioventricular connection) is a subcategory heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 2 codes; record the one the documentation supports.
Where is Q20.5 in ICD-10-CA?
Q20.5 sits under Q20 Congenital malformations of cardiac chambers and connections, within Q20-Q28 Congenital malformations of the circulatory system, within Chapter 17: Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99).
What coding notes apply to Q20.5?
ICD-10-CA lists Excludes notes for Q20.5, 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 Q20.5
View Q20Q20.0Common arterial trunkQ20.1Double outlet right ventricleQ20.2Double outlet left ventricleQ20.3Transposition of great vessels [TGV]Q20.4Double inlet ventricleQ20.6Isomerism of atrial appendagesQ20.8Other congenital malformations of cardiac chambers and connectionsQ20.9Congenital malformation of cardiac chambers and connections, unspecified