Your company (for self-funded plans) actually decides what’s covered and what isn’t, sets copays and deductibles, and ultimately saves or spends money on healthcare costs. UHC’s role is to apply those rules, maintain the provider network, and handle the billing and customer service.
If your company offers insurance, there is someone who can tell the "insurance company" to cover the service they are not covering. Usually the HR Benefits Administrator, or 'plan sponsor'. And they do it all the time! If you have a sad story and the budget is ok for the quarter, they will help! If you are a company officer, you can also have whatever your company can afford.