In this economics thesis, I addressed one of the effects that the Affordable Care Act has had on US Health Care since its full implementation in 2014: supply side effects. Specifically, I answered the following question: what is the effect of the implementation of the Affordable Care Act on patient wait times in primary care offices? In order to narrow the field of research, I focused on the tier of the ACA that called for increased Medicaid expansion. Since Medicaid has not been expanded evenly in all states, it has created a robust control group for causal studies such as this. I used a difference-in-difference model and a multivariable regression to establish causality between Medicaid expansion and increased patient wait times. I used data gathered from the Current Population Surveys from 2004, 2009, 2014, and 2016, in 15 different cities around the US (some faced increased Medicaid expansion, and others did not). The dependent variable data (new patient wait times) were extracted from a 2017 Merritt Hawkins Survey which found the wait times for new patient appointments in different medical services across the 15 different cities for the four different years. The different services are as follows: cardiology, dermatology, obstetrics-gynecology, and orthodpedic surgery, and family medicine (where wait times were only measured in 2009, 2014, 2017). This thesis has been fully developed over a yearlong process of data collection and analysis. My findings highlight areas of the ACA that can be improved to accommodate the proven increased demand for health care, especially given that the supply of health care services responds slower than demand for health care, leading to longer patient wait times.