45 CFR 500.2 - Notice of entry or withdrawal of counsel in claims.
(a) Counsel entering an appearance in a claim originally filed by a claimant in the claimant's own behalf, or upon request for a substitution of attorneys, will be required to file an authorization signed by the claimant.
(b) When counsel seeks to withdraw from the prosecution of a claim, he or she will be required to demonstrate that the client (claimant) has been duly notified.
Title 45 published on 2013-10-01
no entries appear in the Federal Register after this date.