The diocese was formed in 1982 with the parishes in Idukki district in Kerala.

[1] The Idukki Diocesan metropolitan's bishop house is Gathsemon Aramana which is situated at Chakkupallam.

Zachariah Mar Severios is the Metropolitan of Idukki Diocese.

He bought the land at Chakkupallam and constructed the bishop's house named Gathesemon Aramana.

The parishes in the diocese scattered across large geographical area.