Bhutan (B) (NB), China (mainland) (B) (NB), India (B) (NB), Nepal (B) (NB).
Eastern Himalayas in central and eastern Nepal (eastern from Dhaulagiri massif) east to north-eastern India (east to eastern Arunachal Pradesh, also south of R Brahmaputra in Nagaland and western Manipur); also southern Xizang (Chumbi and Tsangpo valleys), in south-western China.
 
Population
Estimated population is unknown (2011).
Sikkim Treecreeper (Certhia discolor) [XC329001]
by Mike Dooher from Tikjuk, West Sikkim, Sikkim, India (call)
Sikkim Treecreeper (Certhia discolor) [XC889794]
by Frank Lambert from Dirang, India (call, song)
Subspecies
No subspecies.
Certhia discolor (Sibley and Monroe 1990, 1993) has been split into Brown-throated Treecreeper (Certhia discolor) and Manipur Treecreeper (Certhia manipurensis) following Tietze et al. (2006).
Formerly treated as conspecific with Manipur Treecreeper (Certhia manipurensis), but now separated on basis of vocal and genetic evidence. Birds from north-eastern India (Nagaland, western Manipur) sometimes placed with Manipur Treecreeper (Certhia manipurensis), but plumage details indicate clear affiliation with this species.