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» About Us » Company History » Management Team Company History 2007 IHG merged with The Parker Group, Inc. 2005 Emerald Health Network merged with Interplan Health Group. 2004 The Chandler Group of Companies, including Superien Health Network, Health Payors Organization, Ltd., and AmeriScript merged with Interplan Health Group. 2003 Accountable Health Plans of America, Inc. merged with Interplan. IPACQ, Inc. changed network and holdings name to Interplan Health Group. 2001 Interplan Corporation purchased by IPACQ, Inc. 1984 Interplan Corporation, a California PPO, was founded.