I have insurance from Chickering. It is a part of Aetna. I have been going to the obstetrician and recently received a hefty bill stating that my claims have been denied, although the ob's office called the insurance company on my first visit, and was told that I would be covered. Has anything like this happened to you before? Were you responsible for the bill? I have tried calling the insurance company, but could not get a human on the phone. Hrmph!