Objective: Iverson and Brooks (2011) proposed psychometric criteria for identifying possible and probable cognitive impairment using an abbreviated version of the NAB. Concordance between the abbreviated module criteria and base rates for the full Memory Module for older patients was investigated. Method: Test protocols with completed full Memory Modules from a database including elderly outpatient clinic patients were investigated (N= 20). Protocols were evaluated for possible or probable impairment for the abbreviated versus full module using base rates of low scores at several different thresholds for impairment. Results: When impairment was defined based on scores below 1 standard deviation from the mean, concordance was perfect (κ = 1.0, p < .001) between the abbreviated and full module. When defined using scores below the 10th percentile, concordance was substantial (κ = 0.706, p = .001). McNemar Chi-square indicated that there were no significant differences when categorizing impairment with the short versus longer version. Conclusion: Concordance between abbreviated versus full NAB Memory Module versions was substantial to perfect in this convenience sample. The current sample is small. Further investigation in a larger sample is warranted.