Would vicodin show up as an opiate in a urine test?

In short yes, most likely Vicodin will cause your drug test to be positive.

However, the reason is not because it comes up as an Opiate. There is a separate section specifically for Hydrocodone. The reason for this being that Vicodin is not a natural occurring Opiate. It contains the semi-synthetic opiate Hydrocodone.

Not -all- tests will include Hydrocodone on their test. Although, there is a very high probability that a test will include it.

On a positive note, it will be out of your system within 2-4 days from the last time you used it.