Q24.3 Pulmonary infundibular stenosis

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis. Exempt from present-on-admission (POA) reporting.

Applicable to

• Subvalvular pulmonic stenosis

Applies from Q24 Other congenital malformations of heart

Excludes1 (never code together)

• endocardial fibroelastosis (I42.4)

MS-DRG index

Defines the logic of DRG(s) 306-307 in MDC 05.

Approximate ICD-9-CM (GEMs)

• 746.83 Infundibular pulmonic stenosis

Code annotations containing back-references to Q24.3

Back-references to Q24

• Code Also: I27.21 Secondary pulmonary arterial hypertension ("congenital heart disease (Q20-Q28)")
• Type 2 Excludes: P29 Cardiovascular disorders originating in the perinatal period ("congenital malformations of the circulatory system (Q20-Q28)")
• Code Also: Z71.87 Encounter for pediatric-to-adult transition counseling ("congenital malformations of the circulatory system (Q20-Q28)")

Diagnosis Index entries for Q24.3

• Anomaly, anomalous (congenital) (unspecified type) › heart › valve NEC › pulmonary › stenosis › infundibular
• Anomaly, anomalous (congenital) (unspecified type) › heart › valve NEC › pulmonary › stenosis › subvalvular
• Anomaly, anomalous (congenital) (unspecified type) › pulmonary › valve › stenosis › infundibular
• Anomaly, anomalous (congenital) (unspecified type) › pulmonary › valve › stenosis › subvalvular
• Separation › infundibulum cardiac from right ventricle by a partition
• Stenosis, stenotic (cicatricial) › infundibulum cardia
• Stenosis, stenotic (cicatricial) › pulmonary (artery) (congenital) › infundibular
• Stenosis, stenotic (cicatricial) › pulmonary (artery) (congenital) › subvalvular
• Stenosis, stenotic (cicatricial) › pulmonic (congenital) › infundibular
• Stenosis, stenotic (cicatricial) › pulmonic (congenital) › subvalvular
• Stricture › pulmonary, pulmonic › infundibulum (congenital)

Nearby codes

• Q24 Other congenital malformations of heart
• Q24.0 Dextrocardia
• Q24.1 Levocardia
• Q24.2 Cor triatriatum
• Q24.3 Pulmonary infundibular stenosis (this code)
• Q24.4 Congenital subaortic stenosis
• Q24.5 Malformation of coronary vessels
• Q24.6 Congenital heart block
• Q24.8 Other specified congenital malformations of heart
• Q24.9 Congenital malformation of heart, unspecified