Security Tinted Large Medical Claim Form Envelope designed for Claim Forms for Medicaid & Medicare. Use this envelope to send unfolded claims to health insurance companies. When printing is complete, insert your CMS 1500 Claim Form in a Pre-Printed Insurance Envelope. If you have several Insurance Claim Forms to mail to a particular Insurance Carrier, choose one of our large Insurance Claim Envelopes for bulk mailings. They will make your job so much easier. Speed up your insurance claims by using our compatible mailing envelopes. Imprinted with “First Class Mail, Health Insurance Claim Forms and Please Do Not Bend” for easy identification.