This brush finch is recorded in Colombia’s eastern Andes. A 2014 study compared photographs and vocalizations of the Colombian nominate form, describing its white chin, green mantle and moustachial marking.
The Colombian nominate form is identified by a strong moustachial mark, white chin and green mantle. The paper notes subspecies differences in the extent of rufous on the crown and in throat color.
A 2014 comparison described trilled songs as the main vocalization for the A. albofrenatus group. Only two of 40 recordings of the Colombian nominate form contained slow-whistled songs.
An extinction-risk assessment has not been added yet.