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 66536-4: Have you been told by a rheumatologist that you have psoriatic arthritis [PhenX]

Name: LOINC Code 66536-4: Have you been told by a rheumatologist that you have psoriatic arthritis [PhenX]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:46.210Z

66536-4 is a LOINC code used to identify Have you been told by a rheumatologist that you have psoriatic arthritis [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 Have you been told by a rheumatologist that you have psoriatic arthritis. 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 Have you been told by a rheumatologist that you have psoriatic arthritis. 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

Have you been told by a rheumatologist that you have psoriatic arthritis [PhenX]
Have you been told by a rheumatologist that you have psoriatic arthritis
Arth; Arthritis dx. Rheumatologist; Finding; Findings; Ordinal; Point in time; QL; Qual; Qualitative; Random; 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

Have you been told by a rheumatologist that you have psoriatic arthritis [PhenX]Arthritis dx. Rheumatologist PhenXHave you been told by a rheumatologist that you have psoriatic arthritisPHENXFindPt^Patient

Frequently asked questions

Code details

Code66536-4

SystemLOINC

Display nameHave you been told by a rheumatologist that you have psoriatic arthritis [PhenX]

DescriptionHave you been told by a rheumatologist that you have psoriatic arthritis

Short nameArthritis dx. Rheumatologist PhenX

ComponentHave you been told by a rheumatologist that you have psoriatic arthritis

PropertyFind

TimingPt

System (specimen)^Patient

ScaleOrd

MethodPhenX

ClassPHENX

StatusTRIAL

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.38

Last changed2.65

Part names

Have you been told by a rheumatologist that you have psoriatic arthritisFindPt^PatientOrdPhenXFindingPoint 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.