Ventricular septal defect. Q21.0 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2022 edition of ICD-10-CM Q21.0 became effective on October 1, 2021. This is the American ICD-10-CM version of Q21.0 – other international versions of ICD-10 Q21.0 may differ.
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