Candid Health (W20) is rebuilding the medical billing stack for healthcare providers, automating the work required to get claims submitted correctly and providers paid. Medical billing is a $200–300 billion market, and much of it still runs on decades-old software and manual processes. Today, @candid_health serves more than 200 healthcare organizations, processes about $7 billion in claims each year, and recently raised a $120 million Series D to keep expanding into the broader healthcare…