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O21.1 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 O21.1 became effective on October 1, 2021. This is the American ICD-10-CM version of O21.1 – other international versions of ICD-10 O21.1 may differ. ICD-10-CM Coding Rules.
Introduction to ICD-10 Coding
ICD-10 Basics: What is ICD-10?
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