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.

LOINCActive

LOINC Code 21993-1: Site and laterality and sequence number override flag Cancer case

Name: LOINC Code 21993-1: Site and laterality and sequence number override flag Cancer case
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:30.108Z

21993-1 is a LOINC code used to identify Site and laterality and sequence number override flag Cancer case 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 Site&laterality&sequence number override flag. It is commonly used with the system or sample type Cancer case.XXX.

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 Site&laterality&sequence number override flag. It is commonly used with the system or sample type Cancer case.XXX.

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

What it does not mean

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

Key facts

Site and laterality and sequence number override flag Cancer case

Site&laterality&sequence number override flag

Some computer edits identify errors. Others indicate possible errors that require manual review for resolution. To eliminate the need to review the same cases repeatedly, over-ride flags have been developed to indicate that data in a record (or records) have been reviewed and, while unusual, are correct. This over-ride is used with the following Interrecord Edit from the SEER ProgramVerify Same Primary Not Reported Twice for a Person (SEER IR09) Presently, documentation on interrecord edits is not included in the EDITS software. Some edits check for code combinations that are possible, but quite rare. If the code combination generates an error message and review of the case indicates that the codes are correct for the case, then the over-ride flag is used to skip the edit in the future. See Chapter IV, Recommended Data Edits and Software Coordination of Standards. Over-ride Flag as Used in the EDITS Software Package Edits of the type Site/Lat/SeqNo applies to paired organs and does not allow two cases with the same primary site group, laterality and three digit histology code. This edit verifies that the same primary is not reported twice for a person. Instructions for Coding Leave blank if the program does not generate an error message for the edit Site/Laterality/EOD. Code 1 if the case has been reviewed and it has been verified that the patient had multiple primaries of the same histology (3 digit) in the same primary site group... NAACCR Data Standards and Data Dictionary Version 11

Arbitrary; CA; Misc; Miscellaneous; No; Num; Oncology; Ordinal; Other; Point in time; QL; Qual; Qualitative; Random; Screen; Site/lat/seq # O/R; Spec; To be specified in another part of the message; TUMOR REGISTRY(NAACCR); Unspecified

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

Site and laterality and sequence number override flag Cancer caseSite/lat/seq # O/R Cancer caseSite&laterality&sequence number override flagTUMRRGTArbPtCancer case.XXX

Frequently asked questions

Code details

Code21993-1

SystemLOINC

Display nameSite and laterality and sequence number override flag Cancer case

DescriptionSite&laterality&sequence number override flag

Short nameSite/lat/seq # O/R Cancer case

ComponentSite&laterality&sequence number override flag

PropertyArb

TimingPt

System (specimen)Cancer case.XXX

ScaleOrd

ClassTUMRRGT

StatusACTIVE

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0m

Last changed2.38

Part names

Site&laterality&sequence number override flagArbPtCancer case.XXXOrdSiteandlateralityandsequence number override flagArbitraryPoint in time (spot)Cancer case XXX

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.