2027 ICD-10-CM Diagnosis Code Q23.3Congenital mitral insufficiency
ICD-10-CM Codes›Q00-Q99›Q20-Q28›Q23
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- POA Exempt
- Chronic Condition
Q23.3 is a billable ICD-10-CM diagnosis code for congenital mitral insufficiency. 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. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 66 closely related codes. The code is exempt from POA reporting. Coders also document this condition as acute mitral regurgitation. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Cardiac and circulatory congenital anomalies.
Code Identity
Code Classification
Present on Admission (POA)Billing
Q23.3 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).
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Acute mitral regurgitation
- Congenital insufficiency of mitral valve
- Mitral regurgitation due to congenital abnormality of mitral subvalvular apparatus
- Transient neonatal mitral regurgitation
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to Q23.3: its own notes plus those printed at Chapter 17. A note printed at a category, block or chapter applies to every code under it.
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.
Notes
General instructions on how these codes are used.
- 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 Q23.3, its category, or a range that includes it.
Excludes2 1
These codes carry an Excludes2 note naming Q23.3: its condition is not part of those codes, and both may be reported when the patient has both.
Use Additional Code 1
These codes say to use an additional code from the note, and Q23.3 is one of the codes named.
- Q87.88 CTNNB1 syndrome
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
mitral (valve) See: Insufficiency, mitral;
congenital Q23.3
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Congenital Mitral Insufficiency
mitral valve insufficiency that is present at birth.
Patient EducationClinical
Congenital Heart Defects
Congenital heart defects (CHDs) are problems with the structure of the heart. "Congenital" means that that the problems are present at birth. These defects happen when a fetus's heart doesn't develop normally during pregnancy. Congenital heart defects are the most common type of birth defect.
The full article covers:
- What are congenital heart defects?
- What causes congenital heart defects?
- Who is more likely to have a baby with a congenital heart defect?
- What are the symptoms of congenital heart defects?
- What other problems do congenital heart defects cause?
- How are congenital heart defects diagnosed?
- What are the treatments for congenital heart defects?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert Q23.3 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About Q23.3Overview
What is the ICD-10 code for congenital mitral insufficiency?
The ICD-10-CM code for congenital mitral insufficiency is Q23.3 (sometimes written as Q233). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is Q23.3 (Congenital malformations of aortic and mitral valves) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report congenital mitral insufficiency on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does Q23.3 group to?
When congenital mitral insufficiency 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 Q23.3 a CC or MCC?
CMS lists Q23.3 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 66 closely related codes in its exclusion list.
Is Q23.3 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 congenital mitral insufficiency on inpatient claims. The code appears in the Congenital malformations of the circulatory system (Q20-Q28) range of the CMS exempt list.
