Arkansas is one of seven states for which CMS has approved a Section 1115 waiver to condition Medicaid eligibility on meeting work and reporting requirements and the first state to implement this type of waiver. CMS approved Arkansas’ waiver on March 5, 2018, and the new requirements took effect for the initial group of beneficiaries (those ages 30-49) on June 1, 2018. Unless exempt, enrollees must engage in 80 hours of work or other qualifying activities each month and must report their work or exemption status by the 5th of the following month using an online portal; as of mid-December, they also may report by phone. A review of monthly data related to the new requirements released by the Arkansas Department of Human Services shows that from September through December 2018, over 18,000 people were disenrolled for failure to comply with the new requirements for three months. In January, enrollees who were disenrolled can regain coverage (if they reapply) and enrollees ages 19 to 29 will be subject to the requirements for the first time. Those who fail to comply with the requirements for three months could lose coverage in April 2019. This brief looks at data for December 2018. Separate reports look at early implementation of the new requirements and enrollee experiences.