Fraud is something that is known to every business that has been established. Just like other businesses have suffered losses because of fraud, insurance businesses have also suffered the same thing.

It is likely that an insurance company would double-check or run background checks on a person suspected of committing a fraud with them.
Regarding health insurance, companies may also conduct checks on a person. This is because there have been cases with fraud as well in health insurance. The fraud usually takes place in the form of cheating. For instance, if a customer says that he/she does not consume a particular substance that is hazardous to the health while he/she does just the opposite, it could cause problems. Suppose the same customer develops a condition that he/she wanted protected through the plan, and that condition developed because of consuming the substance that he/she was not supposed to. This means that a fraud has in fact occurred, and the insurance company has every right to withhold payments to the client.
In order to determine whether or not a person has really used a prohibited substance that was responsible for the onset of a condition, medical examinations are conducted. In the actual sense, one cannot really determine whether the prohibited substance was the real cause of the condition or whether it was some other factor. Proof that the prohibited substance was consumed is more than enough for an insurance company to win its case. This is precisely what happens in many cases. Sometimes, customers may not even realize that they have consumed a prohibited substance; they may have consumed it as a component of another mixture, and may not have really known about it. Hence, people really need to be careful when they are under health insurance plans.
In most cases, it is not a problem to get an insurance claim. This is because insurance companies know who they can trust and who they cannot. As far as claims that are made for cancer, insurance companies tend to scrutinize the customer. This is in order to make sure that the cancer has developed in spite of the person adhering to precautionary measures.
Source-Medindia