It comes as the Good Will Hunting star finalised his divorce with Jennifer Garner, 46, who he shares children Violet, 12, Seraphina, nine, and Samuel, six with.
The 13 going on 30 actress was the one to help her struggling ex earlier this year, when she drove him to a rehab facility in August.
Ben - who previously spent time in rehab in 2001 and 2017 - agreed to seek treatment once again following an emotional outburst from Jennifer, who urged him to get help.
Witnesses at the time said she arrived at his Pacific Palisades home in Los Angeles, carrying a bible and accompanied by a lawyer.
Despite their split in 2015, the pair remain close and were seen with their son, Samuel in Los Angeles, last week - a day after a judge signed the final divorce papers.
The pair will share legal custody of their children and will have to consult one another regarding all major decisions relating to the youngsters' health, education and welfare.
Taking to his Instagram account earlier this month, Ben explained that he'd spent 40 days at a treatment centre and was still in outpatient care.
He said in his post: "The support I have received from my family, colleagues and fans means more to me than I can say. It's given me the strength and support to speak about my illness with others."
Ben also revealed he was determined to fight his addiction for the sake of himself and his family.
The Gone Girl star shared: "Battling any addiction is a lifelong and difficult struggle. I am fighting for myself and my family."
He is believed to have cooled his his relationship with 22-year-old Playboy model Shauna Sexton, as he chooses to focus on his recovery instead.
