For the CMS100 v4 released May 2015, the Value Set for "Aspirin Allergen RXNORM Value Set (2.16.840.1.113883.3.117.1.7.1.139)" decreased from 154 values in the 2013 version of the measure down to 91 values in the 2015 version of the measure.
Can you please explain the rationale for this decrease?
thank you.