Michigan Compiled Laws, Chapter 500. Insurance Code of 1956 § 500.3501

(a) “Affiliated provider” means a health professional, licensed hospital, licensed pharmacy, or any other institution, organization, or person that has entered into a participating provider contract, directly or indirectly, with a health maintenance organization to render 1 or more health services to an enrollee.Affiliated provider includes a person described in this subdivision that has entered into a written arrangement with another person, including, but not limited to, a physician hospital organization or physician organization, that contracts directly with a health maintenance organization.

(b) “Basic health services” means medically necessary health services that health maintenance organizations must offer to large employers in at least 1 health maintenance contract. Basic health services include all of the following:

(c) “Credentialing verification” means the process of obtaining and verifying information about a health professional and evaluating the health professional when the health professional applies to become a participating provider with a health maintenance organization.

(d) “Health maintenance contract” means a contract between a health maintenance organization and a subscriber or group of subscribers to provide or arrange for the provision of health services within the health maintenance organization's service area. Health maintenance contract includes a prudent purchaser agreement under section 3405.  1

(e) “Health maintenance organization” means a person that, among other things, does the following:

(f) “Health professional” means an individual licensed, certified, or authorized in accordance with state law to practice a health profession in his or her respective state.

(g) “Health services” means services provided to enrollees of a health maintenance organization under their health maintenance contract.

(h) “Service area” means a defined geographical area in which covered health services are generally available and readily accessible to enrollees and where health maintenance organizations may market their contracts.