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) [XC415187]
by Peter Boesman from Mandala Road, India (call)
Sikkim Treecreeper (Certhia discolor) [XC201079]
by Mike Dooher from Eaglenest Wildlife Sanctuary, Arunachal Pradesh, India (song)
Subspecies
No subspecies.
Certhia discolor (Sibley and Monroe 1990, 1993) has been split into Brown-throated Tree-Creeper (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.