Q23.8 ICD-10-CA code: Other congenital malformations of aortic and mitral valves
Q23.8 is the ICD-10-CA code for “Other congenital malformations of aortic and mitral valves” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
Q23.8Other congenital malformations of aortic and mitral valves
Short description: Oth congen malform aortic & mitral valve
ICD-10-CA · Canada · Also written Q238
Index terms
Entries in CIHI’s alphabetical index that lead to Q23.8. Searching the index by the condition the note names is how coders reach this code.
- Quadricuspid aortic valve
- Cleft (congenital), valve, mitral
- Supernumerary (congenital), aortic cusps
- Deformity, aortic cusp or valve (congenital)
- Malformation (congenital), aortic valve, specified NEC
- Malformation (congenital), mitral valve, specified NEC
- Supernumerary (congenital), cusps, heart valve NEC, aortic
- Anomaly, anomalous (congenital) (unspecified type), mitral (leaflets) (valve), specified NEC
Notes for Q23.8
As CIHI prints them, with any note Q23.8 takes from the headings above it.
Includes
- Cleft mitral valve
Excludes
Conditions classified elsewhere.
- That with mention of multiple valve involvement (I08.-)
- Inborn errors of metabolism (E70-E90)From Chapter 17: Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
Where Q23.8 sits
- 1ChapterChapter 17: Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- 2Block Q20-Q28Congenital malformations of the circulatory system
- 3Category Q23Congenital malformations of aortic and mitral valves
- 4Valid code Q23.8Other congenital 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.
Frequently asked questions
What does ICD-10-CA code Q23.8 mean?
Q23.8 is the ICD-10-CA code for “Other congenital malformations of aortic and mitral valves” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is Q23.8 in ICD-10-CA?
Q23.8 sits under Q23 Congenital malformations of aortic and mitral valves, 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 Q23.8?
ICD-10-CA lists Includes, Excludes notes for Q23.8, 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.