Typically, students admitted to the PhD program are offered full funding (matriculation fee, tuition, and health insurance) and a stipend for living expenses. Spots in this program are limited and funding for non-U.S citizens is extremely limited. Given that, the admissions process is highly competitive so be sure to submit your application—with all supporting documents—by the published deadline.
Tuition for the Johns Hopkins Bloomberg School of Public Health can be found here. Please note that tuition and fees are the same for U.S. and international students.