Commit medical identity theft :
https://www.consumer.ftc.gov/articles/0171-medical-identity-theft

A thief may use your name or health insurance numbers to see a doctor, get prescription drugs, file claims with your insurance provider, or get other care. If the thief’s health information is mixed with yours, your treatment, insurance and payment records, and credit report may be affected.

If you see signs of medical identity theft, visit IdentityTheft.gov to report and recover from identity theft.

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Protecting Your Medical Information

Your medical and insurance information are valuable to identity thieves.

Be wary if someone offers you “free” health services or products, but requires you to provide your health plan ID number. Medical identity thieves may pretend to work for an insurance company, doctors’ offices, clinic, or pharmacy to try to trick you into revealing sensitive information.

Don’t share medical or insurance information by phone or email unless you initiated the contact and know who you’re dealing with.

Please call the real blue cross blue shield if you haven't already done so. They will help you with what to do next.

So if that is the number that called you, why are you posting in a number thread that clearly states at the top of the page that it is  2015469975?

I gave them personal information on me and my husband.  Felt it was real, because I received a call from blue cross blue shield concerning my asthma. What could they do with my medical info, address, and member id, and prescription id?

Call the REAL BC&BS for one. And remember to do the same next time someone CLAIMS to be them