In an Aug. 20 news release, Aetna and Coventry Health Care Inc. announced an agreement under which Aetna will acquire Coventry in a transaction which is valued at $7.3 billion.  As a result of the agreement, Aetna is expected to add over 5 million total members across their commercial businesses, Medicare Part D, Medicare advantage and Medicaid.  It is estimated that the acquisition will close in mid-2013.