If a urine drug screen is performed at 9am (coded with CPT code 80301) and

If a urine drug screen is performed at 9am (coded with CPT code 80301) and it is repeated later in the day with a new specimen due to change in patient status is it appropriate to code 80301 with modifier 91. Since the CPT code states per date of service I wanted to have this clarified.

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CPT Knowledgebase - Feb 4, 2016