Pricing and Comparison Yax is FREE If you like what we're doing, a subscription to our tutorials will support the project .Yax Tablet. Yax is a fluoroquinolone antibacterial which acts by inhibiting DNA synthesis in susceptible organisms via inhibition of both DNA gyrase . Here we have listed down all the Blue Shield Prefixes along with BCBS home plan name and website for BCBS member IDs ranging from YAA to YZZ. For your ease