If you are receiving FECA benefits from OWCP and a reduced Social Security Disability payment from SSA, you can get SSA to "pay" your attorney fees as an "excludable expense." SSA has a document available online explaining how to report your attorney fees paid in connection with receiving FECA benefits from OWCP. The attorney fees will be used to reduce the offset amount. See SSA POMS - DI 52150.050 - Excludable Expenses
http:/policy.ssa.gov/poms.nsf/links/0452150050