---
title: "Allergy/Intolerance List Entry "
slug: "core-key-concepts-allergy-intolerance-list-entry"
updated: 2023-05-16T21:41:16Z
published: 2023-05-16T21:41:16Z
canonical: "docs.ursahealth.com/core-key-concepts-allergy-intolerance-list-entry"
stale: true
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ursahealth.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Allergy/Intolerance List Entry

## Definition

Documentation of a patient allergy or intolerance that is currently active, or was historically active. Typically, “allergy” refers to a patient’s propensity for immune system response to a substance and “intolerance” refers to a patient’s propensity for any other adverse reaction to a substance; but the precise distinction between these two concepts might differ from provider to provider.

## Purpose

Typically used to identify patients with particular allergies or intolerances. Is not currently used in any Synthetic Objects or Data Marts.

## Related Objects

- [Allergy / Intolerance Entries](https://docs.ursahealth.com/v1/docs/core-objects-allergy-intolerance-list-entries)
  - Allergy / Intolerance Entries, Precursor 1 (All Source Records)
- [ICD-10-CM Diagnosis Code Reference](https://docs.ursahealth.com/v1/docs/core-objects-icd-10-cm-diagnosis-code-reference)

## Detailed Narrative of Logic

- Allergy or intolerance list entry records from all contributing source systems, having been mastered and conformed to the appropriate semantic and structural standards as necessary, are collected in Allergy / Intolerance Entries, Precursor 1 (All Source Records).
- The natural object Allergy / Intolerance Entries then removes source system records flagged as deleted or with duplicate identifier values – keeping the record with the most recent Last Updated Datetime value – and generates a Document ID value for each remaining record (with document type token AILE).
- If a record is missing its Allergy / Intolerance Description, a replacement value is obtained, if possible, from the ICD-10-CM Long Description field on ICD-10-CM Diagnosis Code Reference, using the original record’s ICD-10-CM Code as the lookup value.