New OCM Payment Model

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Is there anyone familiar with the new OCM payment model for oncology? The facility I work for was accepted to participate in this new payment model. I code according to the coding guidelines as far as primary and secondary codes. An example, patient has breast cancer which was treated and no longer present. So I would use the Z code for history of breast cancer. If it metastasizes to another site, I use the secondary code for that site. When billing, we bill with the secondary site first followed by the history of code. The support team for CMS OCM is telling us to code the current breast cancer code with the secondary code even though the cancer is no long in the breast site. This is going against the coding guidelines. Does anyone have any opinions on what to do in this case?