LOINCActiveBoth

LOINC Code 79151-7: Known allergies to food or environmental agents

79151-7 is a LOINC code used to identify Known allergies to food or environmental agents in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Known allergies to food or environmental agents. It is commonly used with the system or sample type ^Patient.

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Known allergies to food or environmental agents. It is commonly used with the system or sample type ^Patient.

When is it used?

  • Used in lab systems, EHRs, and clinical data exchange.
  • May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
  • Status: ACTIVE
  • Order vs observation: Both

What it does not mean

  • The code identifies the observation or test, not the actual result.

Key facts

Known allergies to food or environmental agents
This term is used to report a patient's known allergies to food or environmental agents. This term was created for, but not limited in use to, the eHistory.07 variable included in the National EMS Information System (NEMSIS). A suggested list of SNOMED CT environmental/food allergies is available on the NEMSIS download site (http//nemsis.org/v3/resources.html).
Allergies to food environment; Finding; Findings; H+P; H+P.HX; Nominal; P prime; Point in time; Random

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Common synonyms

Known allergies to food or environmental agentsAllergies to food environmentH&P.HXFindPt^PatientNom

Frequently asked questions

Code details

Code79151-7
SystemLOINC
Display nameKnown allergies to food or environmental agents
Short nameAllergies to food environment
ComponentKnown allergies to food or environmental agents
PropertyFind
TimingPt
System (specimen)^Patient
ScaleNom
ClassH&P.HX
StatusACTIVE
Order/ObservationBoth

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.54
Last changed2.58

Part names

Known allergies to food or environmental agentsFindPt^PatientNomFindingPoint in time (spot)

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.