"HPN has assembled data on 100,000 patients, which it will be sharing with contest entrants. ("It's all HIPAA-compliant," assures Gluck; the patients cannot be reidentified.) Lab data, prescription information, treatment plans--it's all there. "Teams then look at the data and create an algorithm that says, in the year following the data, did they wind up going to hospital?" Since the data is all from a few years back, the answers are available, so the coders can test themselves."