Increases the number of authorized sites for the Medicare subvention demonstration project for certain Medicare-eligible military retirees and their dependents (a project established by the Balanced Budget Act of 1997 under title XVIII (Medicare) of the Social Security Act). Provides for the future repeal of the limitation on the number of such sites (thus allowing the project to be conducted at any site designed by the Secretary of Health and Human Services and the Secretary of Defense acting jointly). Makes the project permanent, with its cap on the aggregate amount of calendar year reimbursement that may be made under the project to end after calendar year 2000.

Makes further changes regarding the project, permitting payment under it to be made on a fee-for-service basis for certain project enrollees, and eliminating certain restrictive project participation policy. Applies to certain Medigap (Medicare supplemental health insurance policy) enrollees the same protections (prohibitions against issuer discrimination) as apply to enrollment (and termination of enrollment) with a Medicare+Choice organization in a Medicare+Choice plan under Medicare part C (Medicare+Choice).