TOPS CMS-1500 Form Self-Seal Window Envelopes, Box of 500 (50992) White CMS-1500 Medicare and Medicaid envelope features a self-sealing closure Designed for CMS-1500 claim forms (formerly known as HCFA-1500 claim forms) Includes an address window on the right side Convenient self-sealing closure Customer receives 1 box of 500 envelopes