This is always a question I welcome, particularly at this time of year. A big reason to become aware of the 2021 new-year changes to diagnosis is that although they are indicated as 2021 codes, they actually update on Oct. 1, 2020, not in 2021. Thus, these updates require that any date of service or billing on or after Oct. 1, 2020, must reflect the new or revised code, or it will be denied. 

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