The Indochinese Mountain Maxomys has bright orange upper fur and a white underside. Surveys have recorded it in primary forest in southern Vietnam.
Its soft upper fur is bright orange, sharply contrasting with the white underside. The body fur is not spiny.
In surveys on the Dalat Plateau, three animals were caught in 2008 and two in 2009; all five records came from primary forest.
An extinction-risk assessment has not been added yet.