I have multiple claims I need to resubmit, and I need to provide proof of timely filing along with the resubmitted claim. I know for rebilling a claim I would need to use the Misc Billing Options HCFA within the encounter and provide the original claim number to submit a corrected claim. I also need to attach proof of timely filing, and I wanted to know now others have handled that within OpenEMR. Can you attach a doc somehow to the fee sheet? Suggestions would be appreciated!