Blue cross blue shield plan May bring lawsuit to challenge Insurance Commissioner Barnes' order for procedural changes* Post Js 25, 1976 p.3 Membership in Blue Shield of Colorado medical service plan grew to nearly 902,000 during 1975. Post F 18, 1976 p.25 Blue Cross - Blue Shield rate increases for medicare related cases. Post F 19, 1976 p.33 Blue Cross - Blue Shield building costs to be investigated by a Colorado legislative committee. Post F 19, 1976 p.15 0