The Black-headed Mountain Greenbul lives in mountain forests from southern Kenya to northern Tanzania. In the October 2024 Clements treatment, separated from the Kikuyu Mountain Greenbul, it has a blacker head and mainly gray underparts.
The October 2024 Clements revision describes A. nigriceps, separated from the related Kikuyu Mountain Greenbul, as having a blacker head and mainly gray underparts.
A regional bird account places it in mountain forests of northern Tanzania and southern Kenya.
An extinction-risk assessment has not been added yet.