The doctor’s decision to use the Blue Light over more conventional treatment would be seen as a judgement.  I doubt you could prove that it is not legal. 

However, falsifying records by stating the physician treated the patient, when it was the PA, is against the law. 
But, be careful.  It is your word against a physician’s.  It is hard to win in a situation like this. 

I do wish you the best, but be careful and get other employees to agree, in writing, if you choose to pursue this.

Take care,