Statute requires that Plan Administrator reimburse for room and board at a mental health facility where a similar surgical or medical stay would be so reimbursed.
The court's reading does not conflict with agency interpretations.
http://cdn.ca9.uscourts.gov/datastore/opinions/2018/06/06/16-35609.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.