Sen. John D. Rockefeller IV, D-W.V., has called on Cigna to explain why it allegedly "purges" small businesses whose employees have "serious health problems." Wendell Potter, a former Cigna executive, told Rockefeller's Senate Commerce, Science and Transportation Committee in June that insurance companies raise the premiums on small businesses reporting higher-than-expected claims to a point that the businesses cannot afford to pay them -- sometimes leaving workers uninsured. Cigna has denied the practice.

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