Wal-Mart Stores’ U.S. employees will pay between 8 percent and 36 percent more in premiums for its medical coverage in 2013, prompting some of the 1.4 million workers at the nation’s largest private employer to say they will forego coverage altogether.

In mailings sent to employees for its recently completed open-enrollment period, Wal-Mart [WMT 72.47 0.16 (+0.22%) ] noted that its rates would increase because health-care costs continue to rise.

For its most popular plan, which covers individuals, the payment per bi-weekly paycheck is going up by $2, or 13 percent. Other plans will see larger increases as the world’s largest retailer, known for low prices, tries to control its own costs.

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