Insurance company is forcing me to use their pharmacy, is there anything I can do?

Question Details: I have BCBL Health Insurance and Caremark takes care of our perscription meds. I get my meds through Walmart and the Caremark has sent me a letter requiring me to purchase a 3 month supply of my medication from CVS or from their mail order company. If I purchase them anywhere else, they will not pay. I used to get my meds from CVS and had problems with pill shortages and perscription mix ups. What are my rights and what can I do?

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