Cardea Services released a case study examining the experience of The Arizona Partnership for Immunization with third-party billing that includes lessons learned that are relevant to STD and HIV programs looking to increase sustainability. Public health systems, including state and local STD programs and public health laboratories, are adapting to the changing health care environment. While these programs have historically relied on public funding to support the provision of free and low-cost health care services, funding has changed in recent years. With the impact of the Patient Protection and Affordable Care Act, programs are looking to Medicaid and other third-party billing to sustain services. Policy and systems barriers, resource and capacity limitations, varying levels of leadership and staff buy-in, and concerns about billing for public health services often pose obstacles to implementation of billing in a public health setting. This case study highlights the experience of a public health program that has faced these and other challenges. Read the case study here.