20 CFR 410.110(i)
Part B Black Lung (BL) refers to benefits paid on BL claims filed before 01/01/1974.
Part B BL benefits are not offsettable as workers’ compensation (WC). However, a Part
B benefit can be subject to offset as a PDB.
A miner or coal miner is any number holder (NH) who is working or has worked as an
employee in a coal mine, performing functions in extracting the coal or preparing
the coal so extracted.
Benefits paid to a miner or auxiliary under Part B are excluded from PDB offset because
such benefits are based on service performed by a miner in coal mine employment, which
is generally covered employment under section 210 of the Act.
If a NH’s work met the definition of “miner” but was not covered for Social Security
purposes, the Part B benefit would potentially cause a reduction to the Social Security
disability insurance benefits as a PDB.
DI 52115.015 - Federal Mine Safety And Health Act (FMSHA)