The Episcopal Synod of the Malankara Catholic Church held in December 2009, presided over by His Excellency Major Arch Bishop Moran Mor Baselios Cleemis Catholicos, decided to form the new Eparchy of Pathanamthitta. Thus the seventh Eparchy in Malankara Catholic Church, the Diocese of Pathanamthitta came into existence with the consent of His Holiness Pope Benedict XVI, on 25th January 2010. The Diocese is erected bifurcating the Major Archi Episcopal Eparchy of Trivandrum. Most Rev. Yoohanon Mar Chrysostom, Bishop of Marthandam has been appointed as the first Bishop of this new Eparchy. 

The Eparchy of Pathanamthitta has been officially inaugurated in a solemn function witnessed by thousands of people at District Stadium (Cyril Baselios Catholicos Nagar), Pathanamthitta on Saturday, 20th March 2010. Most Rev. Yoohanon Mar Chrysostom took charge as the First Bishop on the same day in another function held at Sacred Heart Malankara Catholic Church at Mylapra near Pathanamthitta. 

The new Diocese is mainly confined to the revenue district of Pathanamthitta. There are 100 parishes in the Diocese and as many as 89 Priests are serving in the Diocese. The Diocesan area is basically hilly in nature including a considerable number of tribal colonies. The people in the area are keeping their centuries old faith in Christianity. The Nilackal/Chayal Church which was erected by St. Thomas the Apostole is situated in the diocesan area. St. Peter’s Malankara Catholic Church, Pathanamthitta is the Cathedral Church of the new Eparchy. Perunadu-Mundanmala where the Servant of God Arch Bishop Mar Ivanios started the reunion movement is also within the Eparchy.