It is Aetna, health coaching call. If you do not answer the initial call and attempt to call the number back, you will get an invalid number response because it is just a call out line, they do not receive calls through that line. Calls from this line are usually preset appointments to discuss your health and what you can do to improve your quality of life.
They are a scam and NOT AETNA.
I was with them 10 years ago and I recently got a phone call on another number on which they called and NOT the number which they have in their database. Not to mention there is no reason for them to call me in the first place. Go figure!