Yocum died after a battle with liver cancer, the Angels said in a statement.
"Dr. Yocum's impact in the medical field will long be remembered across the country," the statement read. "The list of careers he extended is endless."
As a member of the Kerlan-Jobe Orthopedic Clinic in Los Angeles, Yocum was a specialist at the ulnar collateral ligament replacement procedure first done by Dr. Frank Jobe in 1974 on then-Dodgers pitcher Tommy John.
The procedure helped revive John's career and has since been performed on many major league pitchers.
Yocum's last high-profile Tommy John surgery was performed on Washington Nationals pitcher Stephen Strasburg in 2010.