Medicare card To better protect consumers' identities, the new cards remove the member's Social Security number and replace it with a new, randomly generated 11-digit "Medicare number." (Photo: CMS)

Historically, Medicare ID cards have been stamped with the Social Security numbers of members — currently, about 50 million seniors and 9 million people with serious disabilities. But that's been problematic: If a wallet or purse were stolen, a thief could use that information, along with an address or birthdate on a driver's license, to steal someone's identity.

For years, phone scammers have preyed on older adults by requesting their Medicare numbers, giving various reasons for doing so. People who fall for these ruses have found bank accounts emptied, Social Security payments diverted or bills in their mailboxes for medical services or equipment never received.

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