2027 ICD-10-CM Diagnosis Code Q24.3Pulmonary infundibular stenosis
ICD-10-CM Codes›Q00-Q99›Q20-Q28›Q24
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- POA Exempt
- Chronic Condition
Q24.3 is a billable ICD-10-CM diagnosis code for pulmonary infundibular stenosis. 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 61 closely related codes. The code is exempt from POA reporting. Coders also document this condition as bilateral muscular infundibula. 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
Q24.3 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.
- Bilateral muscular infundibula
- Combined valvular-subvalvular pulmonic stenosis
- Infundibular pulmonic stenosis
- Right ventricular fibromuscular infundibular stenosis
- Right ventricular muscular infundibular stenosis
- Right ventricular outflow tract abnormality
- Subaortic infundibulum
- Subpulmonary infundibulum
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to Q24.3: its own notes plus those printed at Q24 and 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.
- Subvalvular pulmonic stenosis
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
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 Q24.3, its category, or a range that includes it.
Use Additional Code 1
These codes say to use an additional code from the note, and Q24.3 is one of the codes named.
- Q87.88 CTNNB1 syndrome
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Anomaly, anomalous (congenital) (unspecified type) Q89.9
infundibular Q24.3
subvalvular Q24.3
infundibular Q24.3
subvalvular Q24.3
Stenosis, stenotic (cicatricial) See Also: Stricture;
infundibulum cardia Q24.3
pulmonary (artery) (congenital) Q25.6
infundibular Q24.3
subvalvular Q24.3
infundibular Q24.3
subvalvular Q24.3
Stricture See Also: Stenosis;
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Pulmonary Subvalvular Stenosis
narrowing below the pulmonary valve or well below it in the infundibuluar chamber where the pulmonary artery originates, usually caused by a defective ventricular septum or presence of fibrous tissues. it is characterized by restricted blood outflow from the right ventricle into the pulmonary artery, exertional fatigue, dyspnea, and chest discomfort.
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 Q24.3 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About Q24.3Overview
What is the ICD-10 code for pulmonary infundibular stenosis?
The ICD-10-CM code for pulmonary infundibular stenosis is Q24.3 (sometimes written as Q243). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is Q24.3 (Other congenital malformations of heart) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report pulmonary infundibular stenosis on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does Q24.3 group to?
When pulmonary infundibular stenosis 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 Q24.3 a CC or MCC?
CMS lists Q24.3 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 61 closely related codes in its exclusion list.
Is Q24.3 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 pulmonary infundibular stenosis on inpatient claims. The code appears in the Congenital malformations of the circulatory system (Q20-Q28) range of the CMS exempt list.
