The demise of Health Republic, the largest of the nonprofit cooperatives created under ObamaCare, left its more than 215,000 enrollees scrambling to find new insurance. But New York’s physicians and hospitals say the shutdown has left them, too, in a lurch. The Medical Society of the State of New York, a physician’s association, said of 800 doctors surveyed, 43% have claims unpaid by the insurer. Of these, 18% said they were owed $25,000 or more.