​Thank you for your inquiry. The intent of this measure is to identify the percentage of patients, considered at high risk for cardiovascular events, who were prescribed or were on statin therapy during the measurement period. The measure specification captures adverse effect, allergy, or intolerance to statin medications via the Quality Data Mode (QDM) datatypes Adverse Event and Allergy/Intolerance in the value set Statin Allergen ​(2.16.840.1.113883.3.117.1.7.1.423). The ICD-10 CM code, T46.6X5A, captures an encounter where the patient experienced an adverse effect to antihyperlipidemic and aniarteriosclerotic drugs. However, the code does not specifically and only include statin medication which is the intent of the exception criteria in this measure. In future updates, consideration will be given to different approaches in capturing this exception criteria as electronic clinical quality measure (eCQM) standards evolve. Please let us know if you have any additional questions or concerns.

Denominator Exception text includes several conditions including exists "Adverse Reaction to Statins" or exists "Allergy or Intolerance to Statins" Code set does not include diagnoses such as T46.6X5A (Adverse reaction to statin), but instead requires the adverse event to be captured as a drug allergy.and valueset for adverse event includes RXNORM codes only. Why is dx T46.6X5A (Adverse reaction to statin) not included?