Thousands of employers in California and nationwide are opting for ‘narrow network’ HMOs, which offer notable savings on insurance premiums but also offer fewer medical providers. By Duke Helfand April 3, 2011, Thousands of employers in California and across the country are slashing expensive doctors and hospitals from their insurance rosters in a move to hold down rising healthcare costs — a trend that is gaining favor with corporate bosses, if not the rank and file. The savings on insurance premiums — nearly 25% in some cases — are gained when companies switch their health plans to “narrow network” HMOs that offer fewer choices of