The diocese has experienced no jurisdictional changes, and is a suffragan of the Archdiocese of Cagayan de Oro.

On 26 February 2018, Pope Francis named Raul B. Dael, Vicar for the Clergy of the Archdiocese of Cagayan de Oro as the bishop of Tandag replacing Nereo P. Odchimar after Odchimar reaching the mandatory age of retirement, which was accepted by Pope Francis.

[2] On top, on a blue / azure field symbolizing fidelity and truth, the crucifix with intertwined lily, a loaf of bread on a plate, and the star—all depicted proper—attributes of St. Nicholas of Tolentino, principal patron of the Diocese.

To the left of the attributes, the blessing hand with brown glove, depicted proper, an allusion to Padre San Pio of Pietrelcina, secondary patron of the Diocese.

The symbol alludes to the Diwata mountain range located in the Province.