A managed care company is forming a Medicare Part D prescription drug plan alliance with a wholesale club chain.

Aetna Inc., Hartford, says it is selling a new Aetna Medicare Rx – Costco Plus Plan with Costco Wholesale Corp., Issaquah, Wash., in 17 states.

The states are Alaska, Arizona, California, Colorado, Florida, Hawaii, Idaho, Illinois, Michigan, Nevada, New Mexico, New York, Ohio, Oregon, Utah, Virginia and Washington.

Premiums for the no-deductible plan range from $50 to $70 a month.

In some cases, the plan will charge no co-payment for generic drugs bought at Costco. In other cases, the Costco co-payment will be $5.

The co-payment for generic drugs bought at network pharmacies other than Costco will be $10.

Costco will be helping to advertise the program in its member magazine as well as through in-store displays.