Use MyMedicareBroker.com to search for a Medicare broker by state or county....

https://wiki-nest.win/index.php/What_Does_%E2%80%9CClient_Services%E2%80%9D_Mean_on_a_Broker_Listing%3F

Use MyMedicareBroker.com to search for a Medicare broker by state or county. Verify the broker’s National Producer Number (NPN), then ask whether they cover Medicare Supplement, Medicare Advantage, Part D, or a combination.