Objectives: The objectives of this study were: 1) to describe the socio demographics and classify chief complaints and reason to visit facilities of patients presenting to public healthcare facilities; 2) To explore difference in these complaints and ICPC-3 groups across socio-demographic and health system level.Design: Cross sectional studySettings: This study was conducted in three districts of Odisha, India. Within each district, the District hospital, one SDH (if available), two CHCs and two PHCs were selected. Thus a total of three DHHs, three SDHs, six CHCs and six PHCs were covered. Two tertiary health care facilities were also be included. Patients aged 18 years and above, attending the Outpatient Departments (OPD) of sampled health facilities were chosen as study participants through systematic random sampling. Results: In total 3044 patients were interviewed. In general, 65% of the sample reported symptoms as their chief complain for reason of encounter whereas 35% reported for disease and diagnosis. Most common reasons to encounter health facilities are fever, hypertension, abdominal pain, chest pain, arthritis, skin disease, cough, diabetes, and injury. Among symptoms categories, highest patients reported for general category (29%) followed by digestive system (16%). In the disease category circulatory system has the highest proportion followed by musculatory system. In symptom categories general, digestive and musculatory system were the key systems for reason of encounter in outpatient department irrespective of different groups of population. In terms of different tiers of health system, the top three reasons to visit OPD were dominated by circulatory system, respiratory system, musculatory system. Conclusion: This is the first Indian study using ICPC-3 classification for all the three levels of health care. Irrespective of age, socio economic variables and tiers of healthcare top three groups to visit public health facility according to ICPC-3 classification were consistent i.e., general, digestive, and circulatory. Implementation of standard management and referral guidelines for common diseases under these group will improve the quality and burden at public health facilities in India.