If you decide to use AGC for your patients, you can charge a gap of up to $500 per patient per episode (up to $800 for obstetrics). By using AGC, you will then receive a higher benefit from the health fund on most items.
However, if you want to charge a higher gap to the patient than $500 (or $800 for obstetrics), then you cannot use AGC. This includes booking fees or any other type of admin fee, which are not allowed under AGC.
You can opt patients in and out of AGC. So, where you want to charge an amount higher than what AGC allows, you should opt the patient out and benefits will be paid up to the MBS fee only.
Whether you are opting the patient in or out, you should put the total charge on the claim to the fund, including the patient gap. And, where you are charging a gap, make sure you provide written information about the charges to allow for informed financial consent (IFC).