044-10 Wyo. Code R. § 10-3
These regulations do not require the use of over insurance provisions in group disability insurance policies or group service plan contracts. If, however, such policies or contracts contain overinsurance provisions, such provisions shall be consistent with these regulations. Overinsurance provisions, or provisions for the reduction of benefits otherwise payable because of other insurance by whatever name designated, other than in conformity with these regulations, shall not be used, except that plans of coverage designated to be supplementary to the policyholder's underlying basic plan of coverage may provide that its coverage shall be excess to that specific policyholder's plan of basic coverage from whatever source provided.
044-10 Wyo. Code R. § 10-3