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.

LOINCActiveObservation

LOINC Code 91021-6: Emergency department visits [#] Reporting Period

Name: LOINC Code 91021-6: Emergency department visits [#] Reporting Period
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:20.875Z

91021-6 is a LOINC code used to identify Emergency department visits [#] Reporting Period 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 Emergency department visits. It is commonly used with the system or sample type ^Event.

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 Emergency department visits. It is commonly used with the system or sample type ^Event.

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: Observation

What it does not mean

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

Key facts

Emergency department visits [#] Reporting Period
Emergency department visits
Number of emergency department visits during a reporting period.
Cnt; Count; ED visits; Number; Public Health; PUBLICHEALTH; QNT; Quan; Quant; Quantitative; Report period

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

Emergency department visits [#] Reporting PeriodED visits RptPeriodEmergency department visitsPUBLICHEALTHNumRptPeriod^Event

Frequently asked questions

Code details

Code91021-6

SystemLOINC

Display nameEmergency department visits [#] Reporting Period

DescriptionEmergency department visits

Short nameED visits RptPeriod

ComponentEmergency department visits

PropertyNum

TimingRptPeriod

System (specimen)^Event

ScaleQn

ClassPUBLICHEALTH

Example units#

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.65

Last changed2.68

Part names

Emergency department visitsNumRptPeriod^EventQnNumber (count)Reporting Period

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.