Claims for patients with coverage through Federal Programs such as the Canadian Armed Forces (CAF) or the Interim Federal Health Program (IFHP - for refugees) are processed by Medavie Blue Cross. They are not submitted to OHIP.
You can register an account on the Medavie Blue Cross website in the link below and submit your claims online. Their website is: https://provider.medavie.bluecross.ca/
You will need the patient's Blue Cross number in order to submit the claims online. Alternatively, if you do not have that information, you can fax/mail your invoice to the applicable Health Services Centre at the patient's Base and they will submit your claim to Blue Cross on your behalf.