The only one that I know about that is not one of those what I would call fly by night, hocus pocus neuropathy treatment centers is the Loma Linda Neuropathic Therapy Center - https://lluh.org/services/neuropathic-therapy-center. There are actually a couple of discussions from members about the Loma Linda hospital:

-- My Experience with Neuropathic Therapy Center at Loma Linda University:
https://connect.mayoclinic.org/discussion/my-experience-with-neuropathic-therapy-center-at-loma-linda-university/
-- Nerve pain treatment with INF - Anyone tried this?:
https://connect.mayoclinic.org/discussion/nerve-treatment-anyone-tried/