We study the possibility of right-handed neutrino Dark Matter (DM) in a gauged U(1 )B - L× Z2 extension of the Standard Model (SM) which is augmented by an additional scalar doublet, being odd under Z2 symmetry to explain the scotogenic radiative neutrino masses. Due to lepton interactions, the right-handed neutrino DM can have additional channels apart from the usual annihilations through scalar and gauge portals, which give rise to much more allowed mass of DM from relic abundance criteria. This enlarged parameter space is consistent with the neutrino oscillation and relic density of DM. Due to the possibility of the Z2 odd scalar doublet being the next to lightest stable particle (NLSP), one can have interesting signatures like displaced vertex or disappearing charged tracks provided that the mass splitting between DM and NLSP is small. © 2021, Springer Nature Singapore Pte Ltd.