Another big California health insurer has stunned individual policyholders with huge rate increases---this time it's Blue Shield of California seeking cumulative hikes of as much as 59% for tens of thousands of customers March 1. Blue Shield's action comes less than a year after Anthem Blue Cross tried and failed to raise rates as much as 39% for about 700,000 California customers. San Francisco-based Blue Shield said the increases were the result of fast-rising healthcare costs and other expenses resulting from new healthcare laws.