Looking for information on board who determines approved amounts

I see a therapist who’s out-of-network and I submit monthly claims to BCBS (which is covered through my employer). I met my deductible a few months ago and receive a percentage reimbursement from them for this expense. For a couple of years, I submitted this claim and received the same amount each month, which made it easy to budget. The last two months however the amount approved by BCBS was lowered. First around $40 per service, this month another $20. It’s roughly $240-$300 less of a reimbursement each month.

When I spoke to a representative from BCBS, they essentially said there is nothing I can do about it. A board meets about the approved amounts and are allowed to change it at any time. He said they could change it daily if they wanted to. I know I can change therapists, schedule fewer sessions, or speak with my therapist about the cost, but my aim right now is to understand what’s occuring at BCBS.

I’m trying to find out more about the board and the approved amounts, but I can’t seem to find anything. I know contacting them is unlikely to cause a change, but I feel strongly that I need to speak up on this issue. I understand that health care costs change, but insurance companies should not be able to change approved amounts whenever they choose without notice and without accessible information regarding the process available to the public. Does anyone know how to find more information about the board who determines approved amounts?