It is found in China, Laos, Myanmar, and Vietnam.

Bianchi's warbler was previously placed in the genus Seicercus.

A molecular phylogenetic study published in 2018 found that neither Phylloscopus nor Seicercus were monophyletic.

[2] In the subsequent reorganization the two genera were merged into Phylloscopus which has priority under the rules of the International Commission on Zoological Nomenclature.

[3] The species name honours the Russian ornithologist Valentin Lvovich Bianchi (1857–1920).