Can you designate which of your insurance is secondary and which is primary?

Secondary medical insurance is a second level of insurance coverage. Under most circumstances, the two policies are independent of each other. One policy may pay for a service while the other may not. The primary policy must pay first, then the secondary. The choice of which policy is primary or secondary is established by a shared rule between insurance companies. It is not the policy holder's choice.

Examples of Primary/Secondary coverage: A husband and wife both work and carry the medical insurance offered by their respective employers. The husband adds his wife to his policy. The wife adds her husband to her policy. Under most circumstances, the husband's plan would be his primary policy and his wife's plan would be his secondary policy. In like manner, the wife's plan would be her primary policy and her husband's plan would be her secondary policy.