Q21.20
Billable codeAtrioventricular septal defect, unspecified as to partial or complete
The ICD-10 code for atrioventricular septal defect, unspecified as to partial or complete is Q21.20.
Clinical notes
Also known as
Alternate wording, synonyms, or specific conditions that fall under this code, listed to help confirm you've picked the right one.
- Atrioventricular canal, NOS
- Endocardial cushion defect NOS
- Ostium primum atrial septal defect (type I) NOS
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •This code describes an unspecified presentation. If the medical record documents a more specific detail (e.g. laterality, type, or affected site), a more specific sibling code should be used instead — see Related codes below.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- Q21.21Partial atrioventricular septal defect
- Q21.22Transitional atrioventricular septal defect
- Q21.23Complete atrioventricular septal defect
- Q21.20Atrioventricular septal defect, unspecified as to partial or complete
Associated MS-DRGs
Q21.20 can serve as the principal diagnosis for these Medicare Severity Diagnosis-Related Groups.
Informational only — actual DRG assignment also depends on procedures, complications/comorbidities (CC/MCC), discharge status, and payer-specific rules not reflected here.