If you wish to check the status of your case, you may also do it online HERE by using your case number. If the system shows that your case is “At NVC”, you must follow the instructions provided to you by the National Visa Center for the next step in processing your case. The Immigrant Visa Unit is unable to access your case information until NVC has completed processing your case and your file has been successfully transferred to our office.
Documents required for Immigrant and Fiancé visas can be found at the following link: http://bangkok.usembassy.gov/immigrant_visas/packets.html.