Obamacare enrollees are straining the finances of community health centers around the country, some health center leaders say. The issue is that many lower-income patients with insurance coverage through the federal and state exchanges bought bronze-tier plans with lower premiums but high deductibles, coinsurance and copayments and no federal cost-sharing subsidies. When these patients face high out-of-pocket costs for care that falls below the deductible, they can't afford it. So the centers are subsidizing that care by offering them means-tested sliding-scale fees. When the centers, which are not allowed to turn away patients for inability to pay, try to get...