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Cigna Corp., one of the country’s largest insurers, has built a system that allows its doctors to instantly reject a claim on medical grounds without opening the patient file, often leaving people with unexpected bills, ProPublica reports. According to corporate documents and interviews with former Cigna officials, over a period of two months last year, Cigna doctors denied over 300,000 requests for payments using this method, spending an average of 1.2 seconds on each case, the documents show.