The Disabled Doctors Network (UK) supports the welfare, rights & inclusion of chronically ill, disabled doctors & medical students in the UK.
https://www.disableddoctorsnetwork.com/
The Alliance of Disabilities and Chronic Illnesses in Medicine (ADACIM) is a group of students, residents, and physicians who have a strong passion for advocacy. Learn more about their organization here: https://www.adacim.org