GradPLUS Loans: Medical students may also take out GradPLUS loans, which are unsubsidized loans and have an annually-fixed interest rate based on the 10-year Treasury note – 2.55 percentage points higher than undergraduate loans.** For GradPLUS loans first disbursed on or after July 1, 2015, and before July 1, 2016, the interest rate is 6.84. GradPLUS loans are limited to the total Cost of Attendance as determined by the institution.**
https://www.aamc.org/advocacy/meded/79232/federal_student_loans.html
https://students-residents.aamc.org/financial-aid/article/direct-plus-loans-graduateprofessional-students/