The 85k figure is an estimate for all Federal loans (including Perkins, HEAL, GSL, federal consolidation loans, etc.). Private loans would not be included in this figure as deferment eligibility would depend on the lender's agreement with you.
There once was an automatic deferment of federal loans for people in graduate medical education (i.e., residents) regardless of their income or monthly loan payment. This automatic deferment is no longer available and all people with federal student loans (regardless of whether they are from undergrad, graduate school, medical school, etc.) are eligible for a maximum of 3 years of hardship deferment if they qualify.
The average debt for all medical students graduating in 2002 was about $104,000 ($91,389 for public schools and $123,780 for private schools). About 19% of 2002 graduates had no debt. About 24% had over $150,000 in loans.