Mental illness is an important cause of morbidity, mortality and poor quality of life. In this study analysis of diagnostic distribution with respect to age, sex, and other parameters and comparison with other studies done. It is a descriptive study, done in a Private Psychiatric Clinic near Kolkata. Time period was 2 yrs (from 1st January 2018 to 31st December 2019). ICD10 is primarily used as diagnostic tool but for purpose of patient management and community need, diagnosis according to symptoms (headache, osteoarthritis, neuropathy etc) used. Data were analyzed and tabulated. Total number of patients visited during study period is 3000 . Among them 1081(36.01%) patients are male, 1919(63.99%) are female. Majority of the patients are in the age group of 20-50 years. Among the patients majority are from Generalized Anxiety Disorder (GAD), Phobiaand Somatoform Disorder (42.4%) whereas Major Depressive Disorder (MDD) consists of 22.6%, Bipolar Affective Disorder( BPAD)- 6.5%, Schizophrenia and other psychotic disorders- 10.2 %, Dementia- 3. 5%.