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.

LOINC

LOINC Code 65380-8: On how many days in the last 3 months did you have a headache, if headache lasted more than 1 day, count each day [PhenX]

Name: LOINC Code 65380-8: On how many days in the last 3 months did you have a headache, if headache lasted more than 1 day, count each day [PhenX]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:44.551Z

65380-8 is a LOINC code used to identify On how many days in the last 3 months did you have a headache, if headache lasted more than 1 day, count each day [PhenX] 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 On how many Ds in the last 3Mo did you have a headache, if headache lasted more than 1D, count each D. 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 On how many Ds in the last 3Mo did you have a headache, if headache lasted more than 1D, count each D. 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: TRIAL
Method: PhenX

What it does not mean

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

Key facts

On how many days in the last 3 months did you have a headache, if headache lasted more than 1 day, count each day [PhenX]
On how many Ds in the last 3Mo did you have a headache, if headache lasted more than 1D, count each D
3 months; Count/time; Dextro; Headache freq last 3Mo; nRate; Number rate; Number Rate = Count/Time; Past; QNT; Quan; Quant; Quantitative

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

On how many days in the last 3 months did you have a headache, if headache lasted more than 1 day, count each day [PhenX]Headache freq last 3Mo nRate PhenXOn how many Ds in the last 3Mo did you have a headache, if headache lasted more than 1D, count each DPHENXNRat3Mo^Patient

Frequently asked questions

Code details

Code65380-8

SystemLOINC

Display nameOn how many days in the last 3 months did you have a headache, if headache lasted more than 1 day, count each day [PhenX]

DescriptionOn how many Ds in the last 3Mo did you have a headache, if headache lasted more than 1D, count each D

Short nameHeadache freq last 3Mo nRate PhenX

ComponentOn how many Ds in the last 3Mo did you have a headache, if headache lasted more than 1D, count each D

PropertyNRat

Timing3Mo

System (specimen)^Patient

ScaleQn

MethodPhenX

ClassPHENX

Example unitsdays/3 mo

StatusTRIAL

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.36

Last changed2.65

Part names

On how many Ds in the last 3Mo did you have a headache, if headache lasted more than 1D, count each DNRat3Mo^PatientQnPhenXOn how many days in the last 3 months did you have a headache, if headache lasted more than 1 day, count each dayNumber Rate3 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.