UnitedHealth had announced the acquisition in June, after competing with Option Care Health.

The acquisition was meant to help expand UnitedHealth's presence in home healthcare, a business it bolstered through a $5.4 billion deal to buy Amedisys' rival, LHC Group, last year.

Oregon's notice said it expects to complete the review within 180 days within receipt of a transaction form, which the agency had confirmed in December, according to Amedisys.

(Reporting by Leroy Leo in Bengaluru; Editing by Krishna Chandra Eluri)