Observing is not diagnosis, and an alternative practitioner can certainly note physical observables, such as voice frequencies, static response, biological terrain, nutritional stresses, etc. Teaching clients how to change, so that the normal form and function of the body may be maintained or restored, is not treating. Providing non-drug modalities, such as magnetic energies, sound frequencies, Bioenergetic Nutrition, body work or massage is not part of orthodox medical treatment, and may be offered by anyone who has been trained in, or learned such complimentary wellness techniques. So say what you do. This is sometimes indicated in acute situations.
Frequency is the primary reality.
Our experience of the world of matter is the result of that underlying reality.