In FL a Chiro can use Xray to determine subluxation or physical examination. My particular DR understood the medical policy to state he must use an Xray. Most Chiro's are into natural healing and do not want their pts exposed to unnecessary radiation. My job was to figure how to send proof of physical examination to Medicare electronically. In FL we need to put DOS in box 14 and location code following primary dx. As far as liability is concerned the DR is responsible for making that decision based on his experience and examination.