Epacris rhombifolia is an erect shrub with several main stems and that typically grows to a height of up to 2 2 m (6 ft 7 in).

Flowering occurs from December to March and the fruit that follows are capsules about 2 mm (0.079 in) long and wide.

[3][4][5] Mountain coral heath was first formally described in 1810 by Lilian Fraser and Joyce Vickery, who gave it the name Epacris microphylla var.

[9]: 466 Epacris rhombifolia grows in wet heath in subalpine areas of Lake Mountain, Mount Baw Baw and the ranges north of Licola in Victoria and in the Barrington Tops, Wingello and Oberon districts of New South Wales.

[3][4][5] This species of Epacris is listed as "endangered" under the Victorian Government Flora and Fauna Guarantee Act 1988.