Medicare rolls are swelling and the Affordable Care Act is bringing more people under the umbrella of insurance coverage. As a result, medical groups and health plans have an ever-more pressing need to predict the costs of care. San Mateo, Calif.-based Apixio wants to fill that need by crunching a lot of existing clinical data, providing healthcare organizations with the intel they need to accurately estimate patient risk. That enables providers to more accurately (and profitably) bill for their services.