there is no way to know for sure.
There are some general guidelines but you haven't provided any details about your situation, your symptoms, your blood test results, your responses to medications which makes it impossible to even hazard a guess.
Does everyone on HRT need HCG? No.
Do some need HCG to support pregnenolone production? based on user input, seems like yes.
Do some need HCG to help maintain fertility or avoid testicular shrinkage? yes.
If you had sky high FSH/LH and low T (primary hypogonadism) then it is more likely (I believe) that HCG would not be as beneficial as someone who is secondary.
I could go into personally stories about being on and off of HCG, but the bottom line is that everyone reacts differently to this art we call HRT. The only way to know for sure is to do a trial run of stopping HCG injections and see how you do. If you crash or experience worsening symptoms, couldn't you take that 'evidence' back to your doctor to try and get him to change his mind?
at 200mg a week, I really really hope that you are monitoring your estradiol, TSH, and cortisol levels.