Walmart storefront Walmart, whose health plans cover 1.1 million U.S. employees and dependents, has recommended since March that workers use one of 800 imaging centers identified as providing high-quality care.

Walmart Inc., the nation's largest private employer, is worried that too many of its workers are having health conditions misdiagnosed, leading to unnecessary surgery and wasted health spending.

The issue crystallized for Walmart officials when they discovered about half of the company's workers who went to the Mayo Clinic and other specialized hospitals for back surgery in the past few years turned out to not need those operations. They were either misdiagnosed by their doctor or needed only non-surgical treatment.

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