Specific code icon 2014 ICD-10-CM Diagnosis Code Q21.2

Atrioventricular septal defect

  • Q21.2 is a billable ICD-10-CM code that can be used to specify a diagnosis.
  • On October 1, 2015 ICD-10-CM will replace ICD-9-CM in the United States, therefore, Q21.2 and all other ICD-10-CM codes should only be used for training or planning purposes until then.
Clinical Information
  • A spectrum of septal defects involving the atrial septum; ventricular septum; and the atrioventricular valves (tricuspid valve; bicuspid valve). These defects are due to incomplete growth and fusion of the endocardial cushions which are important in the formation of two atrioventricular canals, site of future atrioventricular valves.
Applicable To
  • Common atrioventricular canal
  • Endocardial cushion defect
  • Ostium primum atrial septal defect (type I)
Description Synonyms
  • Atrial septal defect, ostium primum type
  • Atrial septal defect, primum
  • Ostium primum defect
Present On Admission
  • Q21.2 is considered exempt from POA reporting.
Mortality Data
  • Between 1999-2007 there were 502 deaths in the United States where ICD-10 Q21.2 was indicated as the underlying cause of death [source: cdc.govlink to cdc.gov]
  • ICD-10 Q21.2 as underlying cause of death data broken down by: gender, age, race, year
ICD-10-CM Q21.2 is grouped within Diagnostic Related Group(s) (MS-DRG v30.0):
  • 306 Cardiac congenital & valvular disorders with mcc
  • 307 Cardiac congenital & valvular disorders without mcc
Convert ICD-10-CM Q21.2 to ICD-9-CM
The following ICD-10-CM Index entries contain back-references to ICD-10-CM Q21.2:
  • Canal - see also condition
  • atrioventricular common Q21.2
  • Common
  • atrioventricular canal Q21.2
  • Defect, defective Q89.9
  • cushion, endocardial Q21.2
    atrial septal (ostium secundum type) Q21.1
    ostium primum type Q21.2
    atrioventricular
    canal Q21.2
    septum Q21.2
    ostium
    primum Q21.2
  • Endocardium, endocardial - see also condition
  • cushion defect Q21.2
  • Imperfect
  • closure (congenital)
    atrioventricular ostium Q21.2
  • Ostium
  • atrioventriculare commune Q21.2
    primum (arteriosum) (defect) (persistent) Q21.2
  • Persistence, persistent (congenital)
  • atrioventricular canal Q21.2
    ostium
    atrioventriculare commune Q21.2
    primum Q21.2
  • Single
  • atrium Q21.2