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ICD-10 diagnosis code

Q21.1 Atrial septal defect

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Q21.1 is the ICD-10 code for Atrial septal defect. It is a four-character subcategory of Q21 (Congenital malformations of cardiac septa), the most specific level in the WHO edition. It belongs to the block Q20–Q28 (Congenital malformations of the circulatory system) in Chapter XVII, Congenital malformations, deformations and chromosomal abnormalities.

Code type
Subcategory (4 characters)
Chapter
XVII · Q00–Q99
Classification
WHO ICD-10, 2019 version

What Q21.1 includes

Conditions and terms that are coded here.

  • Coronary sinus defect
  • Patent or persistent:
    • foramen ovale
    • ostium secundum defect (type II)
  • Sinus venosus defect

Q21.1 in national editions

Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.

SwedenICD-10-SE

Q21.1Förmaksseptumdefekt

NorwayICD-10-NO

Q21.1Atrieseptumdefekt

DenmarkICD-10-DK

DQ211Atrieseptumdefekt

  • DQ211ADefectus sinus coronarii cordis
  • DQ211BDefectus sinus venosi cordis
  • DQ211CÅbentstående foramen ovale
FinlandICD-10-FI

Q21.1Eteisten väliseinän puutokset

  • Q21.10Secundum -tyyppinen eteisväliseinän aukko
  • Q21.11Eteisväliseinän avoin soikea aukko
  • Q21.12Sinus venosus -tyyppinen eteisväliseinän aukko
  • Q21.13Sepelpoukaman puutos
  • Q21.14Lutembacherin oireyhtymä (ASD plus hiippaläpän ahtauma)
  • Q21.15Yhteinen eteinen
  • Q21.18Muu eteistenväliseinän aukko
  • Q21.19Määrittämätön eteistenväliseinän aukko
GermanyICD-10-GM

Q21.1Vorhofseptumdefekt

FranceICD-10-FR

Q21.1Communication interauriculaire

NetherlandsICD-10-NL

Q21.1atriumseptumdefect

United StatesICD-10-CM

Listed through more specific codes:

  • Q21.10Atrial septal defect, unspecified
  • Q21.11Secundum atrial septal defect
  • Q21.12Patent foramen ovale
  • Q21.13Coronary sinus atrial septal defect
  • Q21.14Superior sinus venosus atrial septal defect
  • Q21.15Inferior sinus venosus atrial septal defect
  • Q21.16Sinus venosus atrial septal defect, unspecified
  • Q21.19Other specified atrial septal defect

Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.

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