About 1,600 patients covered by Medicare Advantage plans are expected to lose insurance coverage at MD Anderson Cancer Center by the end of this week, officials at the cancer hospital said Wednesday. The patients have been covered by Blue Cross Blue Shield of Texas, which previously announced that its Medicare Advantage members would no longer receive 'in-network' access to the hospital as of Nov. 1. That means those patients could not receive care at heavily discounted rates. The number of impacted patients has not been previously reported.