"Blue Cross and Blue Shield plans, with a long history of selling medical insurance directly to consumers, are expected to provide much of the subsidized coverage sold through the health law's online marketplaces, or exchanges.... But ... Iowa and South Dakota became the second and third states in which there may be no Blues option when exchange consumers start shopping on Oct. 1. Citing concerns about its ability to deliver quality service as the marketplace ramps up, Wellmark Blue Cross and Blue Shield said it won't offer subsidized plans through those exchanges until 2015."