I have been a health insurance broker for over a decade and every day I read more and more "horror" stories that are posted on the Internet regarding health insurance companies not paying claims, refusing to cover specific illnesses and physicians not getting reimbursed for medical services. Unfortunately, insurance companies are driven by profits, not people (albeit they need people to make profits). If the insurance company can find a legal reason not to pay a claim, chances are they will find it, and you the consumer will suffer. However, what most people fail to realize is that there are very few "loopholes" in an insurance policy that give the insurance company an unfair advantage over the consumer. In fact, insurance companies go to great lengths to detail the limitations of their coverage by giving the policy holders 10-days (a 10-day free look period) to review their policy. Unfortunately, most people put their insurance cards in their wallet and place their policy in a drawer or filing cabinet during their 10-day free look and it usually isn't until they receive a "denial" letter from the insurance company that they take their policy out to really read through it.
The majority of people, who buy their own health insurance, rely heavily on the insurance agent selling the policy to explain the plan's coverage and benefits. This being the case, many individuals who purchase their own health insurance plan can tell you very little about their plan, other than, what they pay in premiums and how much they have to pay to satisfy their deductible.
For many consumers, purchasing a health insurance policy on their own can be an enormous undertaking. Purchasing a health insurance policy is not like buying a car, in that, the buyer knows that the engine and transmission are standard, and that power windows are optional. A health insurance plan is much more ambiguous, and it is often very difficult for the consumer to determine what type of coverage is standard and what other benefits are optional. In my opinion, this is the primary reason that most policy holders don't realize that they do not have coverage for a specific medical treatment until they receive a large bill from the hospital stating that "benefits were denied."