I was at that course last year. Yesh is a good guy. Private practice guy who does pretty well in the Pittsburgh area. Overall the course is run by Yesh and a couple of his partners who have been doing the periph stim and implants for years.
While I have not done any peripheral stim, they claim to have been getting paid. The key was to bill it as a peripheral NERVE stim and not field stim. Even their field stim in the low back, they were billing as a NERVE stim of whatever nerve happened to be in that area.
Overall, the stim implantation was a little more surgery than I was comfortable with. If you do a occipital nerve stim (which appears to be the most useful by the way) you have to place the battery towards the shoulder or tunnel all the way down to the SCS site. The ilioinguinal implant is also a bit more surgery than I am comfortable with as an anesthesiologist.