Q24.5 Malformation of coronary vessels

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

• Congenital coronary (artery) aneurysm

Applies from Q24 Other congenital malformations of heart

Excludes1 (never code together)

• endocardial fibroelastosis (I42.4)

Risk adjustment (HCC)

• RxHCC V08: HCC 188 — Coronary Artery Disease

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 746.85 Coronary artery anomaly (approximate)

Code annotations containing back-references to Q24.5

Back-references to Q24.5

• Type 1 Excludes: I25.41 Coronary artery aneurysm ("congenital coronary (artery) aneurysm (Q24.5)")
• Type 2 Excludes: Q27 Other congenital malformations of peripheral vascular system ("anomalies of coronary vessels (Q24.5)")
• Type 1 Excludes: Q28 Other congenital malformations of circulatory system ("congenital coronary aneurysm (Q24.5)")

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 Q24.5

• Aberrant (congenital) › artery (peripheral) › coronary
• Abnormal, abnormality, abnormalities › coronary artery
• Absence (of) (organ or part) (complete or partial) › artery (congenital) (peripheral) › coronary
• Accessory (congenital) › blood vessels NEC › coronary
• Accessory (congenital) › coronary artery
• Agenesis › artery (peripheral) › coronary
• Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular) › congenital (peripheral) › coronary
• Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular) › coronary (arteriosclerotic) (artery) › arteriovenous, congenital
• Aneurysm (anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular) › coronary (arteriosclerotic) (artery) › congenital
• Anomaly, anomalous (congenital) (unspecified type) › arteriovenous NEC › coronary
• Anomaly, anomalous (congenital) (unspecified type) › artery (peripheral) › coronary
• Anomaly, anomalous (congenital) (unspecified type) › communication › coronary artery
• Anomaly, anomalous (congenital) (unspecified type) › coronary artery or vein
• Anomaly, anomalous (congenital) (unspecified type) › distribution, coronary artery
• Anomaly, anomalous (congenital) (unspecified type) › valve (heart) NEC › coronary sinus
• Anomaly, anomalous (congenital) (unspecified type) › valve (heart) NEC › sinus coronario
• Anomaly, anomalous (congenital) (unspecified type) › vein (s) (peripheral) › coronary
• Atresia, atretic › artery NEC › coronary
• Bridge, myocardial
• Deformity › artery (congenital) (peripheral) NOS › coronary (acquired) › congenital
• Deformity › coronary artery (acquired) › congenital
• Disease, diseased › coronary (artery) › congenital
• Distortion (s) (congenital) › coronary
• Distribution vessel, atypical › coronary artery
• Fistula (cutaneous) › arteriovenous (acquired) (nonruptured) › congenital (peripheral) › coronary
• Fistula (cutaneous) › arteriovenous (acquired) (nonruptured) › coronary › congenital
• Fistula (cutaneous) › coronary, arteriovenous › congenital
• Hypoplasia, hypoplastic › artery (peripheral) › coronary
• Malformation (congenital) › coronary vessels
• Malposition › congenital › artery (peripheral) › coronary
• Narrowing › artery › coronary › congenital
• Single › coronary artery
• Stricture › artery › congenital (peripheral) › coronary
• Stricture › artery › coronary › congenital

Nearby codes

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