Although not addressed in the proposed rule, this final rule also recognizes that a covered entity may as a single legal entity, affiliated entity, or other arrangement combine the functions or operations of health care providers, health plans and health care clearinghouses (for example, integrated health plans and health care delivery systems may function as both health plans and health care providers). The rule permits such covered entities to use or disclose the protected health information of its patients or members for all covered entity functions, consistent with the other requirements of this rule. The health care component must meet the requirements of this rule that apply to a particular type of covered entity when it is functioning as that entity; e.g., when a health care component is operating as a health care provider it must meet the requirements of this rule applicable to a health care provider. However, such covered entities may not use or disclose the protected health information of an individual who is not involved in a particular covered entity function for that function, and such information must be segregated from any joint information systems. For example, an HMO may integrate data about health plan members and clinic services to members, but a health care system may not share information about a patient in its hospital with its health plan if the patient is not a member of the health plan.