I work for a union, and our members are eligible for several different sorts of medical and death insurances. One member called me for information regarding a call from this number, apparently the caller didn't give a company name, office number, or policy or claim number for the member, just told her that they needed to get together at the member's house around 7 or 8 at night to discuss "changes" to her plan.
Please, please, please, if anything similar happens to any other union or non union member out there, check with your union or company through whom this benefit is available, to make sure no one is stealing your personal info. Who knows, this may have not been a scam, but better safe than sorry. It doesn't hurt to go through your primary provider.