My insurance is supposedly one of the better ones. They approved (in writing) implating my Calypso markers for IGRT, but then reversed the decision and would not pay for the scan to verify them every day (that was considered essential by the RO, and they scanned anyway). It was supposedly "experimental", although the VA has that equipment in use in the same manner all over the country. That is a battle that is still ongoing.
Interesting that the much-maligned, supposedly inept VA uses so much "experimental" equipment.
You would be amazed how much I've had to appeal at one level or another.