"Health fund” is simply another way to say health insurance provider. These insurance providers sell hospital coverage plans to clients that can include extras. Under the extras, specific services such as Therapeutic or Remedial Massage can be subject to a discount or rebate given by client's health fund. Often, people will refer to the discount that is given for a specific service as a health fund rebate. This rebate will be a certain amount per appointment up to a yearly limit, depending on which plan the client has. Once a client reaches that limit, they can no longer receive that rebate for that type of service until the next year.
In order for the client to get the rebate, the therapist providing the treatment must have a valid provider number for the health fund that the client has.