There are attoneys that have experience with Medicare and Medicaid, including myself. Based on your question, however, it is hard to determine who committed the fraud.It seems that the provider and patient(s) committed the fraud based on your question. If this is the case the govenrment would be in charge of the prosecution, but a private party could start the proceedings and may be able to get awarded damages or money for there trouble.
You are going to have to be more specific, you have not provided enough information. For example, as Attorney Poulson notes, if a provider has committed Medicare fraud, as in billing for services not provided, a defense attorney comfortable practicing in front of the federal system will be required. Conversely, if you are asking about a situation in which an individual wants to report health care fraud, you would want a plaintiff's firm with significant health care experience.
I am licensed in New Mexico and Pennsylvania, and therefore any discussion of issues related to other states must considered within that context.
In addition, my comments are not intended to create a legal representation but merely to respond to the limited facts presented by the question. Any opinion herein is not meant as a precise statement of legal rights or as a recommendation of any particular course of action.
A more complete legal review can be obtained through local counsel.