Boosted by the business woes of its chief competitor, CVS Caremark jumped five places this year to No. 13 on the Fortune 500. Sales shot up 14% in 2012, thanks in part to customers who defected from Walgreens, after that company’s contract with prescription benefits manager Express Scripts lapsed last year, which resulted in making prescriptions cheaper at CVS. The company also has expanded its own prescription benefits business — Medicare D and Managed Medicaid are growth areas. With its popular “MinuteClinic” service — customers can skip the doctor and get quick, in-store medical consultation — CVS is poised to benefit when changes expected with healthcare reform hit in 2014 (i.e., more insured patients in a world with too-few physicians).