Walgreens is no longer going to fill prescriptions for these four CVS Caremark plans: ArcelorMittal, Johnson Controls, Progressive Casualty Insurance, and the Wisconsin Education Association Trust managed plans. These plans are available in Ohio, Wisconsin, Illinois, Indiana, and Michigan.

Wallgreens says they can't make money on these four plans, saying "The reimbursement rates are unreasonably low and below-market". Wallgreens is trying to preserve profits while CVS Caremark is trying to lower the cost of health care for its members. In this case, it looks like CVS Caremark stonewalled too long.