The insurance company refused to cover a type of radiation therapy for Orrana Cunningham, who had nasopharyngeal cancer.
It is the second large recent healthcare deal to win a thumbs up from the U.S. Justice Department.
The combined company will be led by current Cigna Chief Executive Officer David Cordani.
How is it legal for the company that sells me my meds to own the company that is supposed to help me afford them?
Aetna Inc’s board of directors approved the deal on Sunday, for approximately $207 per share in cash and stock.
The pharmacy chain's move is likely motivated by concerns Amazon could enter the health care sector.
Faulty envelopes are blamed.