Both Suzuki & Nyima (2016) and Tournadre (2014) classifies Basum, a language spoken by 13.5% of the population of Gongbo'gyamda County, to be an unclassified Bodish language and non-Tibetic language.
Tournadre (2014) classifies Basum (Bake) as an unclassified Bodish language that does not belong to the Tibetic branch. Suzuki & Nyima (2016) consider Basum to be a non-Tibetic language. Basum is spoken by 13.5% of the population of Gongbo'gyamda County. 
