Objective: COVID-19 had impacted the healthcare utilization severely in the early stage of pandemic. This study intends to present the massive impact of COVID-19 pandemic on the delivery and utilization of behavioral healthcare services. Method: We have used Optum Claims database, a large de-identified database of the US health insurance claims representing ~15% population. We have chosen behavioral health services that were found to be given to patient in Optum claim database during 2019-2020. We identified claims for our analysis whether these services rendered primarily for behavioral diagnoses using ICD-10-CM diagnostic codes (started from F code) and analyzed the utilization of those services between January 2019 and December 2020 to identify the pattern/change in the use of behavioral services. Results will be stratified further by place of service – inpatient, emergency, and outpatient; and by insurance type – Commercial and Medicare; and states/regions. We will be applying the statistical test to analyze the level of significance of utilization change in 2019 and 2020 time-period. Results: This study observed overall 2% increase of behavioral health service utilization despite the lockdowns in 2020 in comparison to 2019. Month of March, April, and May 2020 have observed sharp decrease in behavioral health utilization of 4%, 16%, and 12% from the same month of previous year. Rest all months of 2020 have seen positive single digit growth in utilization from the same month of previous year. Conclusion: The results suggest that use of care involving behavioral and mental health conditions dropped less than other conditions, and started to increase quickly starting in June 2020, and in subsequent months approached or surpassed the levels of 2019.