Claim Issues with BCBS Blue Card program (Affiliates)(Namely Anthem)

How many of you find it difficult to work with the BCBS Affiliates and their Blue Card Program.  It seems our experience goes one of 2 ways...either the UM/claims go through without an issue or we have nothing but an issue out of the gate (often it revolves around coding...specifically the H205 (HQ).  The struggle is they want us to bill a per deim code when statutorily the H2035 is all that is available.  It is when we have an issue that rarely is it fully resolved.  Currently we have 3 active claim issues one dating back to 2015.  BCBS-MN seems to give it a half hearted attempt to resolve.