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 99356-8: Influenza virus vaccination received in last 12 months

Name: LOINC Code 99356-8: Influenza virus vaccination received in last 12 months
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:33.064Z

99356-8 is a LOINC code used to identify Influenza virus vaccination received in last 12 months 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 Influenza virus vaccination received in last 12Mo. 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 Influenza virus vaccination received in last 12Mo. 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: Observation

What it does not mean

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

Key facts

Influenza virus vaccination received in last 12 months
Influenza virus vaccination received in last 12Mo
1 year; 12Mos; Finding; Findings; Flu vacc last 12Mo; FLUV; H+P; H+P.HX; Immunizations; Influ; Influenza vacc received; Ordinal; P prime; Past; QL; Qual; Qualitative; Screen; Vaccine

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

Influenza virus vaccination received in last 12 monthsFlu vacc last 12MoInfluenza virus vaccination received in last 12MoH&P.HXFind12Mo^Patient

Frequently asked questions

Code details

Code99356-8

SystemLOINC

Display nameInfluenza virus vaccination received in last 12 months

DescriptionInfluenza virus vaccination received in last 12Mo

Short nameFlu vacc last 12Mo

ComponentInfluenza virus vaccination received in last 12Mo

PropertyFind

Timing12Mo

System (specimen)^Patient

ScaleOrd

ClassH&P.HX

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.72

Last changed2.72

Part names

Influenza virus vaccination received in last 12MoFind12Mo^PatientOrdInfluenza virus vaccination received in last 12 monthsFinding12 months

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.