Definitions for "treating physician"
a physician who has provided medical treatment to a party or other person involved in the lawsuit, and who will be questioned about such treatment and matters related thereto
a physician who has "treated the claimant/patient over a number of years
a physician with whom an individual has an on-going doctor-patient relationship at the time the report is required or being prepared
a percipient expert, but that does not mean that his testimony is limited only to personal observations