Billable / Specific Code
ICD-10-CM Q21.20 is the diagnosis code for Atrioventricular septal defect, unspecified as to partial or complete. This code falls under the section "Congenital malformations of the circulatory system" within Chapter 17 — Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Understanding where Q21.20 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, Q21.20 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
Q21.20 is the ICD-10-CM diagnosis code for "Atrioventricular septal defect, unspecified as to partial or complete". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of Q21.20 is Q21.2 ("Atrioventricular septal defect"). Q21.20 provides a more specific classification within this category.
Q21.20 is located in Section Q20-Q28 — "Congenital malformations of the circulatory system" within Chapter 17 of the ICD-10-CM Tabular List.
Use Q21.20 when the patients documented diagnosis matches "Atrioventricular septal defect, unspecified as to partial or complete" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Atrioventricular septal defect, unspecified as to partial or complete is Q21.20.
Yes, Q21.20 can be used as a primary diagnosis code since it is billable and specific.
Q21.20 is in Chapter 17 of the ICD-10-CM Tabular List.
Yes, Q21.20 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.