HOUSTON, July 2, 2020 /PRnewswire/ -- ManhattanLife, one of the oldest health and life insurance companies in the United States, announced today the growth of their partnership with Integrity Marketing Group ("Integrity") with the launch of the ManhattanLife Assurance Company (MAC) Medicare Supplement. This Medicare Supplement product is an extension of the current ManhattanLife Medicare Supplement portfolio and will be distributed exclusively through Integrity Marketing Group.