Election to the seat had to be countermanded due to the death of Congress candidate P Chuba Chang a day before the state went to polls on February 23.
Filing of nominations will end on March 6, election office sources said, adding, the date of scrutiny of nomination of the INC sponsored candidate will be on March 7 and the last date of withdrawal on March 9.
Tuensang Deputy Commissioner-cum-District Returning Officer, T Mhabemo Yanthan, in an official notification has reminded political parties that the Model Code of Conduct will continue to be in force within the jurisdiction of Tuensang Sadar-I Assembly seat till the process of election is completed.
Other two candidates already in the fray are NPF's L Elam Chang and Poyang Changkong Chang (Independent).