Numbers with this prefix were first introduced in 1998.While 6193877715 was originally issued with the info above, the owner of the phone number (619) 387-7715 may have transferred it through a process called porting.
Caller name: MHS
Caller type: Telemarketer
Caller ID: MHS.
I called them back anonymously using *67. The lady said that it's a company for Medicare-approved health plans. So looks like they're an organization that wants to have you switch to a specific Medicare HMO. I didn't ask which one they're working for. She asked me for my number, I said no thanks and hung up.