U.S. ICD-10-CM · FY 2027

Q23 ICD-10-CM Code: Congenital malformations of aortic and mitral valves

A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.

Code definition

Official description

Q23

Congenital malformations of aortic and mitral valves

ICD-10-CM diagnosis code · United States clinical modification

Classification

Where Q23 sits

  1. 1

    Chapter 17

    Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1)

  2. 2

    Section

    Congenital malformations of the circulatory system (Q20-Q28)

  3. 3

    Category Q23

    Congenital malformations of aortic and mitral valves

  4. 4

    Code Q23

    Congenital malformations of aortic and mitral valves

More specific choices

Codes under Q23

Q23 is a non-billable category. Choose the child code that best matches the documented diagnosis.

Q23.0

Congenital stenosis of aortic valve

Q23.1

Congenital insufficiency of aortic valve

Q23.2

Congenital mitral stenosis

Q23.3

Congenital mitral insufficiency

Q23.4

Hypoplastic left heart syndrome

Q23.8

Other congenital malformations of aortic and mitral valves

Q23.9

Congenital malformation of aortic and mitral valves, unspecified

Documentation details

Notes for this code

Inclusion terms

No inclusion terms are listed for Q23.

Code first

No “code first” instruction is listed for Q23.

Use additional code

No “use additional code” instruction is listed for Q23.

Excludes1

Conditions that should not be reported together with this code.

No Excludes1 note is listed for Q23.

Excludes2

Conditions not included here that may be reported separately when present.

No Excludes2 note is listed for Q23.

Transparency

Source and release

Data release

U.S. ICD-10-CM · FY 2027

Effective date

Oct 1, 2026

Publisher

Vero Scribe Inc.

This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.

Review the CDC/NCHS ICD-10-CM source

Code-specific guidance

Frequently asked questions

What does ICD-10-CM code Q23 mean?

Q23 is the FY 2027 U.S. ICD-10-CM code for “Congenital malformations of aortic and mitral valves.”

Is Q23 a billable or specific ICD-10-CM code?

No. Q23 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.

Where is Q23 located in ICD-10-CM?

Q23 is listed in Chapter 17, Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1), within Congenital malformations of the circulatory system (Q20-Q28) (Q20–Q28), under category Q23, Congenital malformations of aortic and mitral valves.

What coding notes are listed for Q23?

No inclusion terms are listed for Q23 in this reference record. No code-first instruction is listed. No Excludes1 note is listed. No Excludes2 note is listed.

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