Indonesian Mountain Weasel has been recorded only in highlands, at 1,400-3,000 m a.s.l. (Meiri et al. 2007, Pusparini and Sibarani 2014), within which its habitat use is unclear. Search effort has been enough to be confident that it is not common below this altitude, if it occurs down there at all; but its true upper limit remains unknown. Most records come from forest - but this might signify nothing more than the preponderance of high-altitude survey in forest rather than other habitats. One sighting, at 3,000 m, was in in scrub above the forest line (Holden 2006). All of the few direct sightings and camera-trap records were by day, suggesting it is diurnal, in keeping with other South-east Asian weasels.

Indonesian Mountain Weasel is known only from the highlands of Sumatra and Java, Indonesia. It occurs on Java in the west and as far east as the Ijang plateau (van Bree and Boeadi 1978, Meri et al. 2007). On Sumatra, it occurs from Bengkulu province in the south, north through Gunung [= Mount] Dempo and Gunung Kerinci in Kerinci Seblat National Park, to Gunung Leuser National Park in the island's far north (Sody 1949, Lunde and Musser 2003, Holden 2006, Meiri et al. 2007, Eaton 2009, Pusparini and Sibarani 2014). All the few records come from between 1,400 and 3,000 m (Meiri et al. 2007, Eaton 2009, Pusparini and Sibarani 2014).

There are no obvious immediate conservation needs for Indonesian Mountain Weasel, given the lack of identified or plausible threats to it. Much of its high-altitude habitat is within already declared protected areas. As a high-altitude species it is perhaps vulnerable in the longer-term to climate change. All records of the species warrant publication to help to refine the scant knowledge base for the species and increase the confidence in assessing its conservation status. The almost complete lack of knowledge concerning its basic natural history is some cause for concern, given the tight linkage to specific prey of some congeners, and thus intrinsic vulnerability. Addressing this knowledge gap is probably the most important conservation-related activity for this species at present.