Recognizing the crisis the COVID-19 pandemic represents to the Home- and Community-Based Services (HCBS) service system and the health, safety, and quality of life of people with intellectual and developmental disabilities (IDD), states temporarily amended their HCBS programs to strengthen service delivery. States are able to temporarily amend their HCBS 1915(c) waiver programs by submitting Appendix K: Emergency Preparedness and Response Waivers to the Centers for Medicare and Medicaid Services (CMS). The aim of this study was to examine if, and how, states increased their reimbursement rates for HCBS IDD waiver services during the COVID-19 pandemic. To do so, we analyzed 294 Appendix Ks which amended HCBS 1915(c) waivers for people with IDD between the start of the pandemic and April 2022. During the pandemic, 34 states and the District of Columbia increased reimbursement rates for 2,435 services provided by 82 HCBS waivers for people with IDD. Increase in reimbursement rates ranged from 3.5% to 160.7%, with an average increase of 23.3%. States most frequently increased reimbursement for supports to live in one’s own home, residential habilitation, and health and professional services. In addition, 12 states and the District of Columbia offered one-time supplemental payments through 25 HCBS waivers for people with IDD. While increasing payments during the pandemic likely helped stabilize the HCBS service system during this period of crisis, what remains to be seen is how the IDD service system will function when this additional funding is discontinued.