With regards to the coverage, I believe you need a referral from a MO to see one...many physicians are fairly skeptical of the benefits of Chiro, but there are some who are fully on board. If this guy's both an MD and Chiro, you're probably more likely to get a referral. I know in the last clinic I worked, our MOs would generally only refer to someone who was both.
This may have changed, my data's getting more dated by the day.