ICD-10 Code Q21.3 - Tetralogy of Fallot

ICD-10-CM Diagnosis Code Q21.3

Diagnosis Code: Q21.3 (Raw: Q213)

Description: Tetralogy of Fallot

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 Q21.3 is designated for Tetralogy of Fallot. 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.