ICD-10 Code Q21.8 - Other congenital malformations of cardiac septa

ICD-10-CM Diagnosis Code Q21.8

Diagnosis Code: Q21.8 (Raw: Q218)

Description: Other congenital malformations of cardiac septa

Classification: International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM)

Fiscal Year: 2026

CMS Section 111 Status: Valid for reporting.

Overview & Clinical Details

ICD-10-CM code Q21.8 is designated for Other congenital malformations of cardiac septa. 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.