closet bend space minimum

Hey guys, I have a weird situation and I want to see if what I have makes sense. Old toilet flange is roughed in at around 16 inches from studs. Walls had about 1.5 to 2 inches of mud and tile so it was in reality a 14 inch rough in. There is a joist right around 10 to 12 inches. Original...

Is 9 3/4" inches from the top of the subfloor to the cement slab underneath sufficient space for a closet bend? Thank You