You have no control over "making Medicare primary". The rules are set by Medicare.
In most cases Medicare is primary unless you have other primary coverage, such as through an employer group health plan. Even then, Medicare is secondary if the group has 20 or more employees.
If you have a supplement plan, Medicare is primary.
In most cases Medicare is primary unless you have other primary coverage, such as through an employer group health plan. Even then, Medicare is secondary if the group has 20 or more employees.
If you have a supplement plan, Medicare is primary.