My dr was prescribing hydrocodone to me. but stopped bcuz didn't show up in drug test. is there another med i mightve been taking to make it not show?

Secondary testing: If you were taking it daily it should have shown up. If there was an error in the testing in the doctors office all urine are sent out or have to go through secondary confirmation because there can be false positive and negatives with the initial screening test. Follow up with your doctor office to see if secondary test confirms that your were taking the meds