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We study the possibility of probing the radiative Dirac seesaw model withdark sector particles going inside the loop, popularly referred to as the Diracscotogenic model via measurements of effective relativistic degrees of freedom${\rm \Delta{N_{eff}}}$ at cosmic microwave background (CMB) experiments. Theloop suppression and additional free parameters involved in neutrino massgeneration allow large ($\sim\mathcal{O}(1))$ coupling of light Dirac neutrinoswith the dark sector particles. Such large Yukawa coupling not only dictatesthe relic abundance of heavy fermion singlet dark matter but also can lead tothe thermalisation of the right chiral part of Dirac neutrinos, generatingadditional relativistic degrees of freedom ${\rm \Delta{N_{eff}}}$. We findthat the parameter space consistent with dark matter phenomenology and neutrinomass bounds can also be probed at future cosmic microwave backgroundexperiments like CMB-S4 via precision measurements of ${\rm \Delta{N_{eff}}}$.The same parameter space, while leading to loop-suppressed direct detectioncross-section of dark matter outside future sensitivities, can also have otherinteresting and complementary observational prospects via charged leptonflavour violation and collider signatures.

Observable ${\rm \Delta{N_{eff}}}$ in Dirac Scotogenic Model