There is absolutely a W/C fee schedule for CA. And if your doctor is in certain MPN's he is contractually obligated to take a reduced fee.
There is also the "cascade". The first procedure is paid at 100%, the 2nd at 75%, the 3rd at 50% etc. You can also "time out" on procedures and modalities.
A key point too is that if you are not billing using the W/C fee schedule, you are NOT entitled to penalties and interest if you have to adjudicate a claim.
It's a messy, messy system, and not getting better (for the doctor or the patients). Sorry.