20 C.F.R. § 410.626 Notice of reconsideration.
Title 20 - Employees' Benefits
If the request for reconsideration is filed by a person other than the party to the initial determination, the Administration shall, before such reconsideration, mail a written notice to such party at his last known address, informing him that the initial determination is being reconsidered. In addition, the Administration shall give such party a reasonable opportunity to present such evidence and contentions as to fact or law as he may desire relative to the determination.
Title 20: Employees' Benefits
PART 410—FEDERAL COAL MINE HEALTH AND SAFETY ACT OF 1969, TITLE IV—BLACK LUNG BENEFITS (1969– )
Subpart F—Determinations of Disability, Other Determinations, Administrative Review, Finality of Decisions, and Representation of Parties
§ 410.626 Notice of reconsideration.