Final answer:
In the context of healthcare insurance, subscribers are known as policyholders, who own the insurance policy and pay the premiums.
Step-by-step explanation:
Subscribers in the context of healthcare insurance terminology are known as policyholders. A policyholder is an individual who owns the insurance policy and is responsible for payment of premiums. This person is also typically the one who receives the insurance benefits or services under the plan. Comparatively, a gatekeeper is often a term used for primary care providers in an HMO who manage patient access to specialists and services. Primary care providers are healthcare professionals who offer general medical services, and case managers are individuals who coordinate care for patients with complex medical needs.