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Q23 ICD-10-CA category: Congenital malformations of aortic and mitral valves

Q23 isn’t a code on its own. Choose one of the 7 codes beneath it, the one the documentation supports.

Official description

Q23

Congenital malformations of aortic and mitral valves

ICD-10-CA · Canada

Codes in Q23

Q23 isn’t a code on its own. Open the code that matches what the note documents.

Q23.0Congenital stenosis of aortic valveQ23.1Congenital insufficiency of aortic valveQ23.2Congenital mitral stenosisQ23.3Congenital mitral insufficiencyQ23.4Hypoplastic left heart syndromeQ23.8Other congenital malformations of aortic and mitral valvesQ23.9Congenital malformation of aortic and mitral valves, unspecified

Notes for Q23

As CIHI prints them, with any note Q23 takes from the headings above it.

Excludes

Conditions classified elsewhere.

  • Inborn errors of metabolism (E70-E90)From Chapter 17: Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)

Where Q23 sits

  1. 1ChapterChapter 17: Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  2. 2Block Q20-Q28Congenital malformations of the circulatory system
  3. 3Category Q23Congenital malformations of aortic and mitral valves

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.

See Q23 in the CIHI source

Frequently asked questions

Is Q23 a valid ICD-10-CA code?

No. Q23 (Congenital malformations of aortic and mitral valves) 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 Q23 in ICD-10-CA?

Q23 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 Q23?

ICD-10-CA lists Excludes notes for Q23, 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 Q23

Q20Congenital malformations of cardiac chambers and connectionsQ21Congenital malformations of cardiac septaQ22Congenital malformations of pulmonary and tricuspid valvesQ24Other congenital malformations of heartQ25Congenital malformations of great arteriesQ26Congenital malformations of great veinsQ27Other congenital malformations of peripheral vascular systemQ28Other congenital malformations of circulatory system