It's possible that your invoices are showing as "rejected" because  the patient's treatment is undergoing a review by committee by Garrison Health Services.
Garrison Health Services review there invoices marked as "Rejected" weekly, and will notify you by email whether the committee have approved or cancelled the invoice.

If you would like to contact Garrison Health Services directly to discuss any questions about a "Rejected" invoice, you can contact the Invoices and Payments team on 1300 126 420, or by email at garrison.offbase@medibank.com.au.

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