This is a California area code. However, my Dr here in Florida uses this company to send out automated reminder calls the day before my appointments. Yes, the messages are sometimes garbled and difficult to understand, however the calls are legit and appear as "Appt Reminder" on my Caller ID.
I just got a call from this number and they let a voicemail saying i had a doctors appointment and I needed to confirm it with my doctors office, I called the doctors office and they said it was a system they used. Nothing to worry about :)