Here is a chart made by @KushigumoAkane on twitter for the entire PLAGF. Pretty spicy upload but he deleted it a fews days later.Yes, but for all theater command. More specifically which brigades the last two digits corresponds to. I figured out the 2nd letter corresponds to theater command.
Sorry it's in Chinese but if there's anything u need to clarify, feel free to ask.
Basically L = Ground force
Then for the letter following it: D = Eastern TC, N = Southern TC, X = Western TC, B = Northern TC, Z = Central TC, J = Xinjiang MR,
S = Tibet MR
The two numbers after it corrospond to the row and column of the unit in the chart. For the Xinjiang and Tibet MRs, the number is written on top of the unit.
So overall: L(TC/MR)(Row)(Column)
Hope this helps.
Edit: this pic is blurry as hell but I guess it might be clearer if u download it and open it through preview e.g.