On the cusp of the Affordable Care Act mandating most Americans to have health insurance next year, a rise in doctors who don't take insurance might seem paradoxical. But health-care experts say the two forces go hand in hand, as patients may find concierge doctors more accessible, especially if traditional doctors get flooded with more patients. Also fueling the trend is a little-known clause tucked into the health-care law that allows direct primary-care to count as ACA-compliant insurance, as long as it is bundled with a "wraparound" catastrophic medical policy to cover emergencies.