What is Abacus? Abacus is an ancient calculating device having its roots in Asia since ages. Abacus in today's times time is made of wood, metal or plastic rectangular frame with freely sliding 5 beads over vertical rods.
A health maintenance organization (HMO) and a preferred provider organization (PPO) have several differences such as which doctors patients can see, how much services cost, and how medical records are kept.The most significant difference between the two organizations is the option to select health care providers.n HMO requires that patients see only doctors or hospitals on their list of providers. With a PPO, patients can see any doctor they wish, usually within a preferred network of providers.
According to an analysis of plans sold in the 36 states for which the federal government runs the online insurance marketplace as well as the plans sold on the California exchange, HMO offerings made up 40 percent and PPOs another 40 percent. POS plans made up 12 percent and EPO plans 7 percent. Pearson says the explanation may be that insurers anticipated that people who bought a PPO would probably want to use out-of-network providers.