The doctor can't see you now. Consumers may hear that a lot more often after getting health insurance under President Obama's Affordable Care Act. To hold down premiums, major insurers in California have sharply limited the number of doctors and hospitals available to patients in the state's new health insurance market opening Oct. 1. New data reveal the extent of those cuts in California, a crucial test bed for the federal healthcare law. These diminished medical networks are fueling growing concerns that many patients will still struggle to get care despite the nation's biggest healthcare expansion in half a century.