In ICD-10-CM, there is an Instructional note to code the malignancy first, even when the encounter is for the management of anemia due to the malignancy.

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According to the ICD-10-CM Official Guidelines for Coding and Reporting, when a patient is receiving treatment for anemia related to malignancy, the malignancy should be the primary code and the anemia should be assigned as a secondary code. Therefore, the malignancy should be coded first.

In ICD-10-CM, There Is an Instructional Note to Code the Malignancy