Subject to the coordination of benefits act, 1984 PA 64, MCL 550.251 to 550.255, an insurer may include in a group or nongroup disability insurance policy a provision for the coordination of benefits otherwise payable under the policy with benefits payable for the same loss under other group or nongroup disability insurance. An insurer that does not include in a group or nongroup disability insurance policy a provision for the coordination of benefits as described in this subsection shall coordinate benefits under the policy in the manner prescribed in the coordination of benefits act.