Dan Abate doesn’t have diabetes nor is he aware of any obvious link to the disease. Try telling that to data miners.

The 42-year-old information technology worker’s name recently showed up in a database of millions of people with “diabetes interest” sold by Acxiom Corp., one of the world’s biggest data brokers. One buyer, data reseller Exact Data, posted Abate’s name and address online, along with 100 others, under the header Sample Diabetes Mailing List. It’s just one of hundreds of medical databases up for sale to marketers.

In a year when former National Security Agency contractor Edward Snowden’s revelations about the collection of U.S. phone data have sparked privacy fears, data miners have been quietly using their tools to peek into America’s medicine cabinets. Tapping social media, health-related phone apps and medical websites, data aggregators are scooping up bits and pieces of tens of millions of Americans’ medical histories. Even a purchase at the pharmacy can land a shopper on a health list.

“People would be shocked if they knew they were on some of these lists,” said Pam Dixon, president of the non-profit advocacy group World Privacy Forum, who has testified before Congress on the data broker industry. “Yet millions are.”

They’re showing up in directories with names like “Suffering Seniors” or “Aching and Ailing,” according to a Bloomberg review of this little-known corner of the data mining industry. Other lists are categorized by diagnosis, including groupings of 2.3 million cancer patients, 14 million depression sufferers and 600,000 homes where a child or other member of the household has autism or attention deficit disorder.

The lists typically sell for about 15 cents per name and can be broken down into sub-categories, like ethnicity, income level and geography for a few pennies more.

Diaper Coupons

Some consumers may benefit, like those who find out about a new drug or service that could improve their health. And Americans are already used to being sliced and diced along demographic lines. Lawn-care ads for new homeowners and diaper coupons for expecting moms are as predictable as the arrival of the AARP magazine on the doorsteps of the just-turned 50 set. Yet collecting massive quantities of intimate health data is new territory and many privacy experts say it has gone too far.

“It is outrageous and unfair to consumers that companies profiting off the collection and sale of individuals’ health information operate behind a veil of secrecy,” said U.S. Senator Jay Rockefeller, a West Virginia Democrat. “Consumers deserve to know who is profiting.”

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