What does this LOINC code represent?

This LOINC code identifies a lab observation, measurement, question, or clinical concept in a standardized format.

Is this enough to understand my test result?

No. The code identifies the test or observation, but the interpretation depends on the actual result, reference range, and clinical context.

LOINCActive

LOINC Code 18791-4: Include all data of the selected type within or aligned to an encounter by the same service or encounter

Name: LOINC Code 18791-4: Include all data of the selected type within or aligned to an encounter by the same service or encounter
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:27.591Z

18791-4 is a LOINC code used to identify Include all data of the selected type within or aligned to an encounter by the same service or encounter 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 Include all data of the selected type within or aligned to an encounter by the same service or encounter. It is commonly used with the system or sample type X12^277.

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 Include all data of the selected type within or aligned to an encounter by the same service or encounter. It is commonly used with the system or sample type X12^277.

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

What it does not mean

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

Key facts

Include all data of the selected type within or aligned to an encounter by the same service or encounter
Indicates inclusion of all data of the selected type within or aligned to a service (e.g., Radiology report for test performed during a visit or ordered during the visit and performed within five days).
ATTACH; ATTACH.MODIFIER; 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

Include all data of the selected type within or aligned to an encounter by the same service or encounterATTACH.MODIFIERScope.modifier.selection itemPtX12^277-Point in time (spot)

Frequently asked questions

Code details

Code18791-4

SystemLOINC

Display nameInclude all data of the selected type within or aligned to an encounter by the same service or encounter

ComponentInclude all data of the selected type within or aligned to an encounter by the same service or encounter

PropertyScope.modifier.selection item

TimingPt

System (specimen)X12^277

Scale-

ClassATTACH.MODIFIER

StatusACTIVE

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0l

Last changed2.44

Part names

Include all data of the selected type within or aligned to an encounter by the same service or encounterScope.modifier.selection itemPtX12^277-Point 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.