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OWCP always challenges cases and forces the employee to provide detailed medical information to prove their injury was caused by something that happened in the course and scope of their duty at work. If you do have pre-existing conditions your doctor is going to have to thoroughly explain how with a reasonable degree of medical certainty that the accident either made your injury worse or aggravated the pre-existing condition and then the employer is still liable for that injury. If your medical records do not support their claim of pre-existing injury, then you can prove they are denying your claim in bad faith and you could seek to ask for penalties including attorney's fees for their improper denial of your claim.
I am afraid that you are going to have to file a workers compensation
appeal with OWCP, as they often force employees to do. You would do best using a local workers compensation attorney to file your OWCP claim and appeal to fight them to make them to pay your claim.
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