Final answer:
When a resolved case-mix diagnosis is replaced by a Z code, it should be placed in M1025 only which is designed for payment diagnosis.
Step-by-step explanation:
In the medical coding domain, when a resolved case-mix diagnosis is replaced by a Z code, it can be positioned in M1025 only that is option A). M1021 and M1025 are part of home health patient assessment dataset used for reporting patient status. M1021 pertains to primary diagnosis, while M1023 pertains to the specific secondary diagnoses. M1025 is designed for additional diagnosis or payment diagnosis. Thus, if a resolved case-mix diagnosis is replaced with a Z code, it will pertain more to M1025 which represents payment diagnosis and not primary or secondary diagnoses.
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