Lifetime Total:
Graduate/Professional $138,500 (maximum $65,500 subsidized)
Medical $189,125 (maximum $65,500 subsidized)
Annual maximums:
Graduate/Professional* $18,500 (maximum $8500 subsidized)
Medical $38,500 (maximum $8500 subsidized)
This includes the total for undergrad debt if you have any as well ... so you can't go over those limits.