Maybe? It would be helpful to know the language of the contract in terms of how long it is in effect, and what constitutes a reasonable cause for changing the terms. (I would want a contract that offers either party an out should things not be to their satisfaction).
South Carolina just changed some laws regarding massage and chiropractic: if insurance is being billed for the massage work, it must be done by an employee of the chiropractor, on site.
This, of course, assumes that the massage therapist does not accept insurance independently of the chiropractor.