Denial Letters From Blue Cross Blue Shield are below. The last letters were from 2006 and since BCBS found out that we published their denial letters, they no longer send us denial letters but give us the denials over the phone. We are not sure about their exact reasons for not contracting with MicroSpine. We Encourage any BCBS members to write their BCBS representative and request that they consider contract with MicroSpine so that your costs are contained.