N.H. Rev. Stat. Ann. § 329:1

Any person shall be regarded as practicing medicine under the meaning of this chapter who shall diagnose, treat, perform surgery, or prescribe any treatment of medicine for any disease or human ailment. "Surgery" means any procedure, including but not limited to laser, in which human tissue is cut, shaped, burned, vaporized, or otherwise structurally altered, except that this section shall not apply to any person to whom authority is given by any other statute to perform acts which might otherwise be deemed the practice of medicine. "Laser" means light amplification by stimulated emission of radiation.