Optum, a leading health services company, and DaVita Medical Group, one of the nation’s leading independent medical groups and a subsidiary of DaVita Inc., are combining. The agreement, entered into on December 5, 2017, calls for Optum to acquire DaVita Medical Group for approximately $4.9 billion in cash. The transaction is expected to close in 2018 and is subject to regulatory approval and other customary closing conditions.