Are there any visa categories for which I should not fill out the DS-160?
Yes. If you are applying for a visa in any of the categories below, you should complete the DS-156, not the DS-160. You must also complete the DS-156K if you are applying for a K-1 visa. If required, you should also complete the DS-157 and DS-158.
Visa Symbol Category
K-1 Fiancé(e) of a U.S. Citizen
K-2 Child of a K-1
K-3 Spouse of a U.S. Citizen
K-4 Child of a K-3