Which of the following is NOT a Tricare premium-based health plan?

Tricare Prime is not a premium-based health plan; it operates primarily on a capitation payment system where beneficiaries do not pay premiums but may have associated costs for certain services. In Tricare Prime, beneficiaries typically pay a co-payment for services when they visit a provider.

In contrast, Tricare Young Adult, Tricare Reserve Select, and the US Family Health Plan are all considered premium-based plans. These plans require beneficiaries to pay a premium each month to maintain coverage. Specifically, Tricare Young Adult allows eligible children to stay on their parent's health plan until age 26 with a premium, while Tricare Reserve Select is available to eligible Reserve members and their families with a monthly premium. The US Family Health Plan is a managed care option available for eligible families, also involving monthly premiums.

The other options clearly indicate a model where premiums are a requirement for enrollment and continuous coverage, making it clear that Tricare Prime stands apart as a non-premium based health plan.