UnitedHealth to buy DaVita clinics for $4.9 billion By: CNBC.com News December 06, 2017 at 06:45 AM EST UnitedHealth has struck a $4.9 billion deal to acquire the DaVita Medical unit of kidney dialysis firm DaVita in an all-cash transaction. Read More >> Related Stocks: Aetna DaVita HealthCare Partner UnitedHealth Group