I lost my passport with my F-1 visa 3 days before leaving to the United States to begin my masters. Can I get an expedited visa appointment and get a new visa? Or can the already approved visa be replaced?
According to the State Department, interview wait times are currently 42 days in Mumbai and 18 days in New Delhi. You may be able to get an expedited appointment:
Qualifications for an Expedited Interview Appointment
Consular sections overseas may be able to expedite your interview date if there is an urgent, unforeseen situation such as a funeral, medical emergency, or school start date. The process to request an expedited nonimmigrant visa interview varies by location. You should refer to the instructions on the website of the Embassy or Consulate Visa Section where you will interview, or on their online appointment scheduling site. You will need to provide proof of the need for an earlier appointment.
The last requirement should be pretty easy to meet in your case.