This case study highlights two examples of community-led monitoring using mystery patient methods to document stigma and discrimination in the provision of HIV health care. The process and outcomes of using these methods in Cameroon and Zimbabwe are described. In each country over a period of 10-12 months, gay and bisexual men and transgender women documented their experiences of seeking care in select health care facilities. In Cameroon, the data were used to to create sensitization trainings for health care workers. In Zimbabwe, health care workers, health care facilities, and the local LGBT community created a continuous improvement feedback system to improve the quality of care for gay and bisexual men.