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 27661-8: Deprecated Physical therapy treatment plan, Date onset or exacerbation of primary diagnosis

Name: LOINC Code 27661-8: Deprecated Physical therapy treatment plan, Date onset or exacerbation of primary diagnosis
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:14.571Z

27661-8 is a LOINC code used to identify Deprecated Physical therapy treatment plan, Date onset or exacerbation of primary diagnosis 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 Date.onset or exacerbation. It is commonly used with the system or sample type Primary Dx for physical therapy treatment plan.

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 Date.onset or exacerbation. It is commonly used with the system or sample type Primary Dx for physical therapy treatment plan.

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: DEPRECATED

What it does not mean

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

Key facts

Deprecated Physical therapy treatment plan, Date onset or exacerbation of primary diagnosis
Date.onset or exacerbation
ATTACH; ATTACH.REHAB; ATTACH.REHAB.PT; Diagnosis; Physical Therapy; Physical therapy Tx; Physical therapy Tx plan; Point in time; Primary dx for physical therapy Tx plan; PT; QNT; Quan; Quant; Quantitative; Random; Tx; Tx Plan

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

Deprecated Physical therapy treatment plan, Date onset or exacerbation of primary diagnosisDeprecatedDate.onset or exacerbationATTACH.REHAB.PTDatePtPrimary Dx for physical therapy treatment plan

Frequently asked questions

Code details

Code27661-8

SystemLOINC

Display nameDeprecated Physical therapy treatment plan, Date onset or exacerbation of primary diagnosis

DescriptionDate.onset or exacerbation

Short nameDeprecated

ComponentDate.onset or exacerbation

PropertyDate

TimingPt

System (specimen)Primary Dx for physical therapy treatment plan

ScaleQn

ClassATTACH.REHAB.PT

Example unitsMMDDYY

StatusDEPRECATED

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.00

Last changed2.66

Part names

Date.onset or exacerbationDatePtPrimary Dx for physical therapy treatment planQnDate onset or exacerbationPoint 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.