The American Medical Association is suing another large health insurer over what it claims was a scheme to underpay doctors for out-of-network medical claims.

The AMA joined several medical societies in filing a lawsuit Wednesday in a Los Angeles federal court against Indianapolis-based WellPoint Inc. The lawsuit accuses the insurer of conspiring to use a much-maligned database maintained by Ingenix Inc. to set artificially low reimbursement rates.

The association contends the underpayments create higher bills for patients.

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