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Allergies and Intolerances

Represents harmful or undesirable physiological response associated with exposure to a substance.

Data Element

Applicable Vocabulary Standard(s)

Reaction

  • SNOMED International, Systematized Nomenclature of Medicine Clinical Terms (SNOMED CT®) U.S. Edition, September 2019 Release
Substance (Drug Class)

  • SNOMED International, Systematized Nomenclature of Medicine Clinical Terms (SNOMED CT®) U.S. Edition, September 2019 Release
Substance (Medication)

  • RxNorm, January 6, 2020 Full Release Update

Data Element

Applicable Vocabulary Standard(s)

Reaction

  • SNOMED International, Systematized Nomenclature of Medicine Clinical Terms (SNOMED CT®) U.S. Edition, March 2021 Release
Substance (Drug Class)

  • SNOMED International, Systematized Nomenclature of Medicine Clinical Terms (SNOMED CT®) U.S. Edition, March 2021 Release
Substance (Medication)

  • RxNorm Full Monthly Release, June 7, 2021

Comment

Option to Tie Adverse Events to FDA-Regulated Medical Products

eHealth Exchange, the nation’s largest health information exchange network, agrees USCDI v2 should provide the option to tie Adverse Events to FDA regulated medical products when applicable.  Vendors should support an interoperable approach, though not necessarily require providers to use it. To improve health of populatons, providers need the option to populate/derive the AdverseEvent resource based on data for already diagnosed/recognized in other resources (such as diagnoses or reactions noted in Condition or AllergyIntolerance, along with other supporting evidence for particular product exposures in MedAdmin, MedStatement, Procedure, or Immunization).

Clarification

This comment was entered at the class level since the intent is to stress that intolerances apply not only to "substances", but also apply to medical devices.  Since intolerances can apply to medical devices, USCDI v2 needs to enable this association.

Overall comments on allergies

Environmental and food allergies are tied to care. Each can inform potential medication allergies, and hospital precautions. For example, a walnut allergy can be indicative of latex allergies, and environmental allergies that bring on asthma can have serious and significant impacts in patient placement in the hospital and in treatment decisions.  Food and environmental allergies are the original social determinant of health, as they are immediate and significant impacts on health. Additionally as patients gain access to records for self-management in apps, environmental and food allergies seem to be a logical area for app development and access needs.  Please consider moving these to USCDI V2

Allergies and Intolerances - Drug Classes & Non-Drug Substances

Drug Classes. Although MED-RT was introduced in recent years (when it superseded NDF-RT), there may be some advantages for its use over SNOMED CT for representing allergies and intolerances to drug classes. First, SNOMED CT combines both drugs and drug classes within the same hierarchy and does not provide a way to easily differentiate between medication concepts and drug class concepts. MED-RT, on the other hand, has classes under the “Preparations by FDA Established Pharmacologic Class” (N0000189939) hierarchy and also has relationships to medication concepts in RxNorm which provides a clean separation between medication and drug class data elements. Second, while SNOMED CT is very comprehensive, it results in more clutter than MED-RT in that there are more concepts that are less clinically useful for the documentation of allergies and intolerances. For example, ancestors of interferon alfa (SNOMED CT 45754009) include Interferon (parent) and Immune enhancement agent (grandparent) which are less clinically useful because they are not drug classes but rather super-groupers that lack the specificity needed for the representation of allergies and intolerances. The MED-RT hierarchy, although not perfect, is less deeply nested with these kinds of super-groupers that can confound decision-making in patients who have these broad and vague allergies and intolerances in their medical records. Admittedly both SNOMED CT and MED-RT have their pros and cons. SNOMED CT is broader and more comprehensive, while MED-RT may be a more focused solution for this use case. It may be interesting to see how MED-RT evolves and whether other community members find it to be potentially useful for representing drug classes. Non-Drug Substances. The ISA section for Allergies and Intolerances include recommendations to use SNOMED CT for the representation of food substances and environmental substances with adoption levels that are similar to or approaching that of the recommendation for the use of RxNorm for representing medications. Are we ready to add "Substance (Food)" and "Substance (Environmental)" as data elements to USCDI? I realize that there is a separate ONDEC submission process for new data elements. This is more of a general discussion to gauge readiness from implementers (I work for a health IT vendor).

Adverse Events / Allergies and Intolerances

Thanks for adding adverse events data elements.  Please add a dedicated adverse events data class for FDA-regulated medical products. An allergy is not always an adverse event.  We suggest having 2 classes: 1) Allergies/Intolerances 2) Adverse Events to FDA regulated medical products  

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