This is how a lot of big companies work. They self-insure. They set the rules, pay all the bills, and the insurance company just administers things.

If you work for a company that does this, be aware that the things you dislike about your insurance coverage may well have been designed that way by your employer, not the insurance company. Don't curse the insurance company when you don't like the benefits. Ask your manager and HR department why your employer chose that rule or limit.