If you have a Mental Health Plan from your GP, Psychiatrist or Paediatrician you are able to claim a rebate through Medicare. Different rebates apply to different settings, therefore, if you want to know what the rebate will be, enquire when you call.
Initially the Mental Health Plan is usually for 6 sessions with the option that you may be able to obtain 4 more. The extra sessions are decided on by the GP and this can be based on the letter and referral information supplied to them by the treating provider. 
