Hi T.,
I too, moved from California and my insurance said it covered Boulder Community Hospital, but Boulder Foothills did not show up in their system. After a lot of confusion and talking to a lot of folks, the insurance DID cover it, since it is the "same" hospital.
I also really recommend Boulder Women's Care (BCW), which is conveniently located on the 3rd floor of the Foothills hospital. It is an all women practice, they have a very welcoming waiting room and ALL the OBGYN's are great! I would particularly recommend Dr. Jennifer Leavitt or Dr. Mako Shimoda. I had prenatal care for both my babies there and had an awesome experience.
Also the hospital staff at foothills was very on the ball and attentive (I had a complicated delivery with my 1st and Dr. Leavitt really worked with me so I didn't have to have a c-section, and my second child ended up in the NICU), and the hospital staff were great and really supportive--very woman/mommy/baby friendly and focused.
Hope this is helpful and good luck with the VBAC!