Would codeine show as morphine in a urine drug screen?

On a simple urine test,Codeine and Morphine will show up as the same thing. This is because Codeine is metabolized to Morphine in the liver. So the Morphine metabolites are excreted in urine. Usually when this happens, the next step is to analyze the levels of these metabolites to deduce whether it was Codeine or Morphine consumed.

On a GC/MS test,this test will show the molecular fingerprint of any drug(s) consumed.