☐ Attach the denial letter from the carrier. Inter-Company Arbitration.Generally speaking, most insurance companies operate, as between one another, through agreements or Treaties. Contractor must cooperate with the Michigan Department of. Insurance and Financial Services (DIFS) in the implementation of. A Guide to Drafting Dispute Resolution Clauses for Commercial Contracts. However, officials of the Michigan Insurance Bureau believe that few of these hospitals are voluntarily offering arbitration agreements.