42 U.S.C. § 7385g

1. (a)Notwithstanding any contract, the representative of an individual may not receive, for services rendered in connection with the claim of an individual for payment of lump-sum compensation under part B, more than that percentage specified in subsection (b) of a payment made under part B on such claim.
2. (b)The percentage referred to in subsection (a) is—
   1. (1)2 percent for the filing of an initial claim for payment of lump-sum compensation; and
   2. (2)10 percent with respect to objections to a recommended decision denying payment of lump-sum compensation.
3. (c)This section shall not apply with respect to services rendered that are not in connection with such a claim for payment of lump-sum compensation.
4. (d)Any such representative who violates this section shall be fined not more than $5,000.