CVS Health Corp (NYSE:CVS) said on Monday that it has agreed to acquire US home healthcare services company, Signify Health for about $8 billion in cash, after a bidding battle in which Amazon.com Inc (NASDAQ:AMZN) and UnitedHealth Inc were reportedly involved. Signify Health will add a network of 10,000 clinicians who provide home-based assessments of patient health and social needs to CVS, which runs pharmacies, pharmacy benefits and the Aetna insurance plans.