It was within the ALJ's discretion to accept specialist medical opinions rather than that of the longtime treating physician.
http://media.ca8.uscourts.gov/opndir/18/07/171987P.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Not written by a barrister. The name was thought up by a second-year American law student sitting in a coffeehouse in Manhattan. Neither an authoritative statement of the law nor legal advice.
Don't rely. Quick work.