2027 ICD-10-CM Diagnosis Code Q23.81Bicuspid aortic valve

ICD-10-CM Codes›Q00-Q99›Q20-Q28›Q23

ICD-10-CM Q23.81
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

Q23.81 is a billable ICD-10-CM diagnosis code for bicuspid aortic valve. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 306 through 307. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Cardiac and circulatory congenital anomalies.

Code Identity

ICD-10-CM Code
Q23.81
Billable Status
Yes — Valid for Submission
Code Describes
Bicuspid aortic valve
Short Description
Bicuspid aortic valve
Same as the full description in the CMS dataset.
Parent Code
Q23.8
Other congenital malformations of aortic and mitral valves

Code Classification

ChapterQ00-Q99Congenital malformations, deformations and chromosomal abnormalities
SectionQ20-Q28Congenital malformations of the circulatory system
CategoryQ23Congenital malformations of aortic and mitral valves
This CodeQ23.81Bicuspid aortic valve

Present on Admission (POA)Billing

Q23.81 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Congenital malformations of the circulatory system (Q20-Q28).

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to Q23.81: its own notes plus those printed at Chapter 17. A note printed at a category, block or chapter applies to every code under it.

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • Congenital bicuspid aortic valve
  • Unicuspid (congenital) aortic valve (at birth)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 17 (Q00-QA1) Congenital malformations, deformations and chromosomal abnormalities applies to 900 codes
  • inborn errors of metabolism (E70-E88)

Code Also

A second code may be needed to fully describe the condition; the note gives no sequencing direction.

  • if applicable, acquired aortic valve disorders, such as:
  • aortic (valve) insufficiency (nonrheumatic) (I35.1)
  • aortic (valve) stenosis (nonrheumatic) (I35.0)
  • aortic (valve) stenosis with insufficiency (nonrheumatic) (I35.2)

Notes

General instructions on how these codes are used.

From Chapter 17 (Q00-QA1) Congenital malformations, deformations and chromosomal abnormalities applies to 900 codes
  • Codes from this chapter are not for use on maternal records

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name Q23.81, its category, or a range that includes it.

Excludes2 1

These codes carry an Excludes2 note naming Q23.81: its condition is not part of those codes, and both may be reported when the patient has both.

  • I08 Multiple valve diseases
    multiple valve disease specified as nonrheumatic (I34.-, I35.-, I36.-, I37.-, I38.-, Q22.-, Q23.-, Q24.8-) names Q23.-, which includes this code

Use Additional Code 1

These codes say to use an additional code from the note, and Q23.81 is one of the codes named.

  • Q87.88 CTNNB1 syndrome
    congenital heart malformations (Q20.0-Q24.9) names Q20.0-Q24.9, which includes this code

Code Also 1

These codes say Q23.81 may also be needed to fully describe the condition. The note gives no sequencing direction.

  • I35 Nonrheumatic aortic valve disorders
    if applicable, bicuspid aortic valve (Q23.81)

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MAL001
Cardiac and circulatory congenital anomalies
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Bicuspid Aortic Valve Disease

    congenital heart valve defects where the aortic valve has two instead of normal three cusps. it is often associated with aortic regurgitation and aortic insufficiency.

Patient EducationClinical

Heart Valve Diseases

Heart valve disease happens when one or more of your heart valves don't work well.

The full article covers:

  • What are heart valve diseases?
  • What are the types of heart valve diseases?
  • What causes heart valve diseases?
  • Who is more likely to develop heart valve diseases?
  • What are the symptoms of heart valve diseases?
  • What other problems can heart valve diseases cause?
  • How is heart valve disease diagnosed?
  • What are the treatments for heart valve diseases?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code History & ChangesHistory

Replacement Q23.81 replaces the following previously assigned code(s):

  • Q23.8 - Other congenital malformations of aortic and mitral valves
FY 2025AddedAdded to the ICD-10-CM code setEffective October 1, 2024.
FY 2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About Q23.81Overview

What is the ICD-10 code for bicuspid aortic valve?

The ICD-10-CM code for bicuspid aortic valve is Q23.81 (sometimes written as Q2381). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is Q23.81 (Other congenital malformations of aortic and mitral valves) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report bicuspid aortic valve on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does Q23.81 group to?

When bicuspid aortic valve is the principal diagnosis on an inpatient stay, it groups to MS-DRG 306, 307, with relative weights from 0.9146 to 1.5457 depending on complications. Higher weights mean higher Medicare reimbursement.

Is Q23.81 exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for bicuspid aortic valve on inpatient claims. The code appears in the Congenital malformations of the circulatory system (Q20-Q28) range of the CMS exempt list.