Thank you for your question related to CMS135v12. Allergy or intolerance to ACEi/ARB/ARNi can be captured in two ways per the measure specifications, either through documented allergy to medication ingredient or a documented diagnosis of allergy to the medication. Logic definitions for each of these options can be found in the measure specification under "Has Allergy or Intolerance to ACEi or ARB or ARNi Ingredient" or "Has Diagnosis of Allergy or ACEi or ARB." If a patient has any of the codes included in these definitions (value sets or direct reference codes) documented in their medical record prior to or during the day of the Moderate or Severe LVSD encounter, they are considered to have an allergy or intolerance to ACEi/ARB/ARNi.   For reference, the value sets and direct reference codes used for capturing allergy or intolerance to ACEi/ARB/ARNi are below:   Value sets that capture allergy and intolerance: • valueset "Intolerance to ACE Inhibitor or ARB" (2.16.840.1.113883.3.526.3.1212) • valueset "Allergy to ACE Inhibitor or ARB" (2.16.840.1.113883.3.526.3.1211)  Direct reference codes that to capture allergy/intolerance: • "Allergy/Intolerance: Substance with angiotensin II receptor antagonist mechanism of action (substance)" using "Substance with angiotensin II receptor antagonist mechanism of action (substance) (SNOMEDCT Code 372913009)" • "Allergy/Intolerance: Substance with angiotensin-converting enzyme inhibitor mechanism of action (substance)" using "Substance with angiotensin-converting enzyme inhibitor mechanism of action (substance) (SNOMEDCT Code 372733002)" • "Allergy/Intolerance: Substance with neprilysin inhibitor mechanism of action (substance)" using "Substance with neprilysin inhibitor mechanism of action (substance) (SNOMEDCT Code 786886009)"