Congenital malformations of aortic and mitral valves
In Congenital malformations of the circulatory system (Q20-Q28), chapter 17: Congenital Malformations, Deformations and Chromosomal Abnormalities
9 billable codes under Q23: 1 is an MCC, 4 are a CC; none map to an HCC.A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment.
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Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Assign Q00-QA1 codes for documented congenital anomalies or genetic disorders at any age, coding non-inherent manifestations separately and sequencing Z38 first on the birth admission.
All codes under Q23
Q23 can't be used on a claim. Pick a billable code below; grey headings group them.
- Q23.0Congenital stenosis of aortic valve
- Q23.1Congenital insufficiency of aortic valve
- Q23.2Congenital mitral stenosis
- Q23.3Congenital mitral insufficiency
- Q23.4Hypoplastic left heart syndrome
- Q23.8Other congenital malformations of aortic and mitral valves
- Q23.81Bicuspid aortic valve
- Q23.82Congenital mitral valve cleft leaflet
- Q23.88Other congenital malformations of aortic and mitral valves
- Q23.9Congenital malformation of aortic and mitral valves, unspecified
Q23 MS-DRGs
As the principal diagnosis, all 9 billable codes under Q23 group to MS-DRG 306 or 307 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
Other codes that refer to Q23
Notes on these codes point to Q23.
- I08 Excludes2: multiple valve disease specified as nonrheumatic (I34.-, I35.-, I36.-, I37.-, I38.-, Q22.-, Q23.-, Q24.8-)
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
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.
Read more about congenital heart defects on MedlinePlusHeart Valve Diseases
Heart valve disease happens when one or more of your heart valves don't work well. Your heart has four valves: the tricuspid, pulmonary, mitral, and aortic valves. The valves have flaps that open and close. The flaps make sure that blood flows in the right direction through your heart and to the rest of your body. When your heart beats, the flaps open to let blood through. Between heartbeats they close to stop the blood from flowing backwards.
Read more about heart valve diseases on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.