ICD-10-CM Diagnosis Code Q21.20
Diagnosis Code: Q21.20 (Raw: Q2120)
Description: Atrioventricular septal defect, unspecified as to partial or complete
Classification: International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM)
Fiscal Year: 2026
CMS Section 111 Status: Valid for reporting (Excluded from No-Fault liability reporting).
Overview & Clinical Details
ICD-10-CM code Q21.20 is designated for Atrioventricular septal defect, unspecified as to partial or complete. In medical documentation and insurance billing, this code is utilized to specify medical diagnosis for patient records, reimbursement workflows, and compliance under CMS Section 111 mandatory insurer reporting guidelines.