The decision making is used to calculate the suitable alternatives with different criteria for the desired problem. The process of identifying a patient’s sickness or condition from the disease symptoms or indicators is known as medical diagnosis. In this paper, two sets of criteria and alternatives are mentioned with number of kid and disease and disease with symptom using linguistic variables, Fuzzy ELECTRE I (Elimination and Choice Translating Reality) method is used to obtain the priority of the kid’s selection for the treatment by combining two sets of criteria and alternatives with obtained CRITIC (Criteria Importance Through Inter Criteria Correlation) weight. The minimum degree of possibilities for each criteria over the other for combining the sets are calculated using as modified Chang’s method. Moreover, the comparison analysis demonstrates that the fuzzy concordance select the maximum weight qualifier for which diagnostic process is more reliable and accurate. This paper presents and finds the particular child is affected with particular disease with different symptom using above two sets of criteria and diseases.