Henry Ford Health System subsidiary Health Alliance Plan has agreed to acquire Trusted HP – Michigan, a 9,000-member Medicaid plan based in Detroit, formerly known as Harbor Health Plan Inc.

The move marks HAP’s re-entrance into the state of Michigan’s Medicaid HMO service area known as Region 10, which includes Wayne, Oakland and Macomb counties.

“We are thrilled to announce a return to offering a Medicaid option that serves the people of metro Detroit,” Henry Ford Health System President and CEO Wright L. Lassiter III said in a statement. “As both a health insurer and health care provider, we are uniquely positioned to offer seamless, holistic care and coverage to our Medicaid population.”

The terms of the agreement provide for a seamless transition for Trusted HP – Michigan members, who will be able to keep their doctor and continue using their services and current ID cards. Trusted HP – Michigan’s nearly two dozen employees will also become part of the HAP team.

Trusted HP – Michigan is owned by Trusted Health Plan Inc., a Washington, D.C.-based managed care organization. Previously named Harbor Health Plan and ProCare Health Plan, the plan has been operating as a licensed HMO in Michigan since 2000.

The acquisition, subject to regulatory approval, is expected to be finalized in late summer. The deal could increase HAP’s Medicaid membership by as much as 9,000 members, most of which are in Wayne County.