Delaware "Proof service" form is a form that is required for health insurance arbitration. This form is used to provide proof of service and must be served on the other party in an arbitration. There are two types of Delaware "Proof service" form required for health insurance arbitration: One is a Health Benefits Provider's Proof of Service form and the other is an Insured's Proof of Service form. The Health Benefits Provider's Proof of Service form is used by a health insurance provider to provide proof of service to an insured party. The Insured's Proof of Service form is used by an insured party to provide proof of service to a health insurance provider. Both forms must be completed, signed, and filed with the Delaware Department of Insurance prior to the date of the arbitration.