From 1 January 2013 the number of individual allied mental health services for which a person can receive a Medicare rebate will be ten services per calendar year. Exceptional circumstances apply when there has been a significant change in the patient's clinical condition or care circumstances which necessitates a further referral for additional services. It is up to the referring practitioner (e.g. GP) to determine that the patient meets these requirements.
A fact sheet providing more detailed information on the arrangements for accessing further allied mental health services under exceptional circumstances can be found on the Department of Health website.