Scammers aren't just after your money. These days, they also want your health insurance card.
A recent study found the number of cases of medical identity theft jumped more than 21 percent in just one year, costing the average victim $13,500 to fix.
Experts warn those numbers may be telling only part of the story since this type of fraud is relatively new and harder to categorize.
"I believe it is vastly under-reported and misunderstood even by victims experiencing it," said Eva Velasquez, president and CEO of the Identity Theft Resource Center, a nonprofit organization that provides education and assistance to victims.
Examples of medical identity theft include someone using your insurance to see a doctor, obtain prescriptions, buy medical equipment or even file a false claim.
As in other types of identity theft, Velasquez said, older Americans are far more vulnerable because they don't monitor their credit as often, are more trusting of online interactions and may be dependent on others for their care.
There are ways you can lower your risk.