HMOs network (HMO) Health Maintenance Organization (HMO) Plans HMOs HMO plan Health Maintenance Organization (HMO) Plan Medicare HMO Information Medicare prescription drug coverage (Part D) HMOs Health Maintenance Organization (HMO) Plans (HMO) HMO plans Medicare.gov: HMO HMOs (HMO) Medicare.gov: HMO Health Maintenance Organization (HMO) HMOs Health Maintenance Organization (HMO) HMO and PPO features HMO’s