Clover Health is a Preferred Provider Organization (PPO) and a Health Maintenance Organization (HMO) with a Medicare contract. Enrollment in Clover Health depends on contract renewal. You must continue to pay your Medicare Part B premium. For plans that provide drug coverage, the formulary may change during the year. Out-of-network/non-contracted providers are under no obligation to treat Clover members, except in emergency situations. For a decision about whether we will cover an out-of-network service, we encourage you or your provider to ask us for a pre-service organization determination before you receive the service.