The Healthcare Cost Institute’s National Chartbook Of Health Care Prices—2015 provides extensive documentation of geographic variation in prices at the health care service level for the commercially insured.
The chartbook can be accessed at http://www.healthcostinstitute.org/files/hcci_chartbook__4.27.2016.pdf?e1q_cid=1276008&x_id=&e1qTrackId=e57f6fdab7d34129b4adac5a56631f91&e1q=d3ef494038524b09b7763b55cf4dc7af&e1qaid=52345&e1qat=1&e1qCampaignId=23160.