800-300-1506

3 rings and a hang up.

This number is now associated with covered california..

Keep getting calls from them, despite the fact that I moved out of the state and cancelled my coverage! (I won't answer, and they aren't leaving a message. So my conclusion is that it's a nuisance call!)

This is a legitimate number for Covered California

This looks to really be from Covered California ( coveredca )
if you go to http://www.coveredca.com/get-help/contact/ and you click on "Service Center Phone Numbers and Hours" -> you'll see

Called several times a day for weeks now. I have no connection to California

Keep getting calls from this #.

Then it seems that you have ample opportunity to answer the call and find out who and why they are calling so that you can make a useful and helpful post.