ICD-10 Diagnosis Code Q21.1

Atrial septal defect

Diagnosis Code Q21.1

ICD-10: Q21.1
Short Description: Atrial septal defect
Long Description: Atrial septal defect
This is the 2018 version of the ICD-10-CM diagnosis code Q21.1

Valid for Submission
The code Q21.1 is valid for submission for HIPAA-covered transactions.

Code Classification
  • Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
    • Congenital malformations of the circulatory system (Q20-Q28)
      • Congenital malformations of cardiac septa (Q21)

Information for Medical Professionals

Diagnostic Related Groups
The diagnosis code Q21.1 is grouped in the following Diagnostic Related Group(s) (MS-DRG V35.0)


Convert to ICD-9 Additional informationCallout TooltipGeneral Equivalence Map
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.
  • 745.5 - Secundum atrial sept def

Present on Admission (POA) Additional informationCallout TooltipPresent on Admission
The Present on Admission (POA) indicator is used for diagnosis codes included in claims involving inpatient admissions to general acute care hospitals. POA indicators must be reported to CMS on each claim to facilitate the grouping of diagnoses codes into the proper Diagnostic Related Groups (DRG). CMS publishes a listing of specific diagnosis codes that are exempt from the POA reporting requirement.

The code Q21.1 is exempt from POA reporting.

  • Abnormal ostium of coronary sinus
  • Atrial aneurysm
  • Atrial septal aneurysm
  • Atrial septal defect
  • Atrial septal defect murmur
  • Atrial septal defect through coronary sinus orifice
  • Atrial septal defect with endocardial cushion defect, partial type
  • Atrial septal defect with endocardial cushion defect, partial type
  • Atrial septal defect, atrioventricular conduction defect syndrome
  • Congenital abnormality of atria and atrial septum
  • Congenital abnormality of atrial septum
  • Congenital abnormality of tricuspid leaflet
  • Congenital atrial septal defect
  • Congenital stenosis of mitral valve
  • Coronary sinus defect in left atrium
  • Double outlet left atrium
  • Double outlet right atrium
  • Ebstein's anomaly
  • Ebstein's anomaly with atrial septal defect
  • Endocardial cushion defect
  • Endocardial cushion defect
  • Fenestrated interatrial communication within oval fossa
  • Foramen ovale valvar aneurysm
  • Interatrial communication through coronary sinus orifice
  • Interauricular septal defect
  • Left to right flow of foramen ovale of fetal heart
  • Lutembacher's syndrome
  • Lymphedema of lower extremity
  • Lymphedema, atrial septal defect, facial changes syndrome
  • Malaligned atrial septum
  • Malattachment of atrial septum
  • Malattachment of atrial septum with posterior aspect of septum primum to left
  • Malattachment of atrial septum with superior aspect of septum primum to left and posterior
  • Nonfenestrated interatrial communication within oval fossa
  • Nonrestrictive interatrial communication
  • Ostium primum defect
  • Ostium secundum type atrial septal defect
  • Patent foramen ovale
  • Pericarditis associated with atrial septal defect
  • Persistent ostium secundum
  • Residual interatrial communication
  • Restrictive interatrial communication
  • Restrictive interatrial communication with obligatory shunt
  • Sinus venosus atrial septal defect
  • Sinus venosus defect with overriding inferior vena cava
  • Sinus venosus defect with overriding superior vena cava

Index of Diseases and Injuries
References found for the code Q21.1 in the Index of Diseases and Injuries:

Information for Patients

Congenital Heart Defects

A congenital heart defect is a problem with the structure of the heart. It is present at birth. Congenital heart defects are the most common type of birth defect. The defects can involve the walls of the heart, the valves of the heart, and the arteries and veins near the heart. They can disrupt the normal flow of blood through the heart. The blood flow can slow down, go in the wrong direction or to the wrong place, or be blocked completely.

Doctors use a physical exam and special heart tests to diagnose congenital heart defects. They often find severe defects during pregnancy or soon after birth. Signs and symptoms of severe defects in newborns include

  • Rapid breathing
  • Cyanosis - a bluish tint to the skin, lips, and fingernails
  • Fatigue
  • Poor blood circulation

Many congenital heart defects cause few or no signs and symptoms. They are often not diagnosed until children are older.

Many children with congenital heart defects don't need treatment, but others do. Treatment can include medicines, catheter procedures, surgery, and heart transplants. The treatment depends on the type of the defect, how severe it is, and a child's age, size, and general health.

NIH: National Heart, Lung, and Blood Institute

  • Atrial septal defect (Medical Encyclopedia)
  • Bicuspid aortic valve (Medical Encyclopedia)
  • Congenital heart defect corrective surgeries (Medical Encyclopedia)
  • Congenital heart disease (Medical Encyclopedia)
  • Cyanotic heart disease (Medical Encyclopedia)
  • Dextrocardia (Medical Encyclopedia)
  • Echocardiogram -- children (Medical Encyclopedia)
  • Heart murmurs and other sounds (Medical Encyclopedia)
  • Patent ductus arteriosus (Medical Encyclopedia)
  • Ventricular septal defect (Medical Encyclopedia)

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