The person who has a health maintenance contract is referred to as the:

In the context of health maintenance organizations (HMOs) and health maintenance contracts, the term "subscriber" is used to identify the individual who enrolls in and participates in the plan. This terminology is specific to health maintenance contracts because it emphasizes the relationship between the individual and the health plan as a participant who accesses the services offered.

A subscriber is the person who pays premiums or fees in exchange for health care services and is often the legal holder of the contract with the HMO. This term distinguishes them from other terms like "insured" or "policyholder," which may apply in broader insurance contexts, but do not specifically convey the ongoing relationship with a health maintenance organization. The designation "member" is also relevant in health plans, but "subscriber" more accurately refers to the contractual nature of their enrollment in a health maintenance organization, focusing on their role in the network of care provided.