Some calculations from the 2013 Milliman HCV report
They estimated that 164 million Americans (53%) out of 310 million were covered by commercial insurance.
The express scripts formulary action applies to 25 million, or 15 % of commercial patients or 8% of all Americans. More importantly, the HCV prevalence among commercial patients is only 0.47%. So this action applies to only 117,500 HCV patients.
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