From another string-look for Q in serial number
All recent M85s are +P rated.
Before "recent" if your S/N started with a "Q", then it was +P rated, if not, then no.
To find out the BOD of your Taurus, go HERE.
As an example, I have a first generation M85SSUL from 1997. Back then, it was called the M85UL. The S/N starts with a"Q". It is +P rated per the then open Taurus Custom Shop.