The $3.42 million settlement comes after allegations that Aetna blocked coverage for proton beam therapy, a targeted radiation treatment for prostate cancer. The settlement also applies to patients who had pre-certification initially approved but later saw post-service claims denied under the same criteria. Aetna Proton Beam Therapy Settlement Who’s Eligible: Members, participants, or beneficiaries of ERISA-governed Aetna plans. Aetna will also cover settlement administration expenses and up to $1.67 million in attorneys’ fees. Claimants must file online or submit forms by mail or email through the settlement administrator, Atticus Administration, based in St. Paul, Minnesota.