Health Maintenance Organizations (HMOs) and Preferred Provider Organizations (PPOs) are sometimes grouped together under the name

Blue Cross-Blue Shield is a federation of independent health insurance organizations that provide various insurance products but does not specifically denote the category of managed care. While some Blue Cross-Blue Shield plans may offer HMO or PPO models, the term itself does not encompass both types collectively.

Internal medicine refers to a medical specialty focused on the diagnosis and treatment of adult diseases. It is unrelated to health insurance models like HMOs and PPOs, which pertain to how healthcare services are organized and delivered rather than the specific medical practices or specialties involved.

Community rating is a method used to set insurance premiums based on the overall health of a community rather than individual health status. It does not represent a category of health insurance organizations like HMOs or PPOs but rather a pricing strategy that may be applied within various types of health plans.