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 99940-9: Pain medication in the past 4 weeks

Name: LOINC Code 99940-9: Pain medication in the past 4 weeks
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:34.292Z

99940-9 is a LOINC code used to identify Pain medication in the past 4 weeks 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 Pain medication in the past 4W. 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 Pain medication in the past 4W. 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

Pain medication in the past 4 weeks
Pain medication in the past 4W
4 weeks; Finding; Findings; H+P; H+P.HX; Last; Ordinal; P prime; QL; Qual; Qualitative; Screen

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

Pain medication in the past 4 weeksPain medication in the past 4WH&P.HXFind4W^PatientOrd

Frequently asked questions

Code details

Code99940-9

SystemLOINC

Display namePain medication in the past 4 weeks

DescriptionPain medication in the past 4W

Short namePain medication in the past 4W

ComponentPain medication in the past 4W

PropertyFind

Timing4W

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

Pain medication in the past 4WFind4W^PatientOrdPain medication in the past 4 weeksFinding4 weeks

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.