There are many reasons why your drug may not be covered.  
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 - Your plan may cover generic drugs only
 - You are not the first payer on the plan (known as co-ordination of benefits)
 - Depending on your plan, this drug is not an approved drug under the Reformulary
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It is best to call either your insurer or provider directly so that they can investigate further and give you an alternative, or ensure that the claim was adjudicated properly.
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Beneplan: 1-800-387-1670
Cooperators Customer Service: 1-800-667-8164
Green Shield Customer Service: 1-888-711-1119
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