This fact sheet, prepared for Healthy People 2020 (which includes a specific focus on lesbian, gay, bisexual and transgender populations), summarizes research on bisexual health.
Fenway Health has a bisexual health program; its website page contains links to useful information and reports on bisexual health issues for patients and health care providers.
A website page from the Brown University Student Health Services contains useful information and resources on bisexual health. While intended primarily for students at the university seeking health services, it is a good summary of issues for both patients and health care providers.