A state appeals court has found that an insurer for the Archdiocese of New York is not required to cover costs for hundreds of sex abuse claims, a ruling the archdiocese calls “extremely disappointing.” The insurer, Chubb, argued that Church officials knew about the abuse and failed to act accordingly, violating the state’s “known loss doctrine,” by which an insured party cannot secure insurance to cover a loss known before the policy’s effective date.