​Thank you for your question on CMS154v11. The language in the header specifying the denominator exclusion for an active prescription of antibiotics reads the following: "Exclude URI episodes when the patient had an active prescription of antibiotics in the 30 days prior to the episode date but is still active the same day of the encounter." This is looking for an active prescription of antibiotics 30 days prior to the episode date, which is correctly specified in the logic. The second half of that exclusion criteria is still relevant because if that specified active prescription continues to be active through the date of the encounter, it still counts as an exclusion. In the logic, we meet this timing criteria using the overlaps operator. We will consider providing further clarifications in a future version of the measure.