This taxon is Not Recognised as a species by BirdLife International.
Cyanoramphus novaezelandiae (del Hoyo and Collar 2014) was previously split as C. novaezelandiae, C. cookii (following Christidis and Boles 1994 and Turbott 1990), and C. saisseti (following Boon et al. 2001), and before then C. saisseti was lumped with C. novaezelandiae, with C. cookii treated as a separate species, following Sibley and Monroe (1990, 1993).
BirdLife International (2016) Species factsheet: Cyanoramphus novaezelandiae. Downloaded from http://www.birdlife.org on 07/12/2016. Recommended citation for factsheets for more than one species: BirdLife International (2016) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 07/12/2016.