This is a topic I have previously posted, but its important and bears repeating. If you are receiving a check from OWCP and are also entitled to Social Security Disability payments from SSA, you may be able to recover legal fees and other unreimbursed expenses through your Social Security disability claim. If SSA is reducing your check, they are taking an "offset" because you are receiving a check from OWCP, you can recover your unreimbursed expenses from SSA. This also applies to other expenses related to your workers compensation, for instance paying for medical a report.
SSA has a document available online explaining how to report expenses such as attorney fees paid in connection with receiving benefits from OWCP. The attorney fees (and other qualifying expenses) will be used to reduce the offset amount. Please click on the link below to SSA POMS - DI 52150.050 - Excludable Expenses, and carefully follow SSA's instructions:
https://secure.ssa.gov/poms.nsf/lnx/0452150050 If this link does not work, do a google search for the document number "POMS 0452150050"