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 21991-5: Age and Site and Morphology override flag Cancer case

Name: LOINC Code 21991-5: Age and Site and Morphology override flag Cancer case
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:30.108Z

21991-5 is a LOINC code used to identify Age and Site and Morphology 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 Age&site&morphology 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 Age&site&morphology 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

Age and Site and Morphology override flag Cancer case

Age&site&morphology 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 edits in the NAACCR Metafile of the EDITS softwareAge, Primary Site, Morphology (SEER IF15) Age, Primary Site, Morph ICDO3 --Adult (SEER) Age, Primary Site, Morph ICDO3--Pediatric (NPCR) 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 Some cancers occur almost exclusively in certain age groups. Edits of the type Age, Primary Site, Morphology require review if a site/morphology combination occurs in an age group for which it is extremely rare. The edit Age, Primary Site, Morph ICDO3--Adult (SEER) edits cases with an Age at Diagnosis of 15 and older. The edit Age, Primary Site, Morph ICDO3--Pediatric (NPCR) edits cases with an Age at Diagnosis of less than 15. The ICD-O-2 version of the edit is Age, Primary Site, Morphology (SEER IF15) and contains logic for all ages. Instructions for Coding Leave blank if the program does not generate an error message for the edit Age, Primary Site, Morphology, the edit Age, Primary Site, Morph ICDO3--Adult, or the edit Age, Primary Site, Morph ICDO3--Pediatric. Leave blank and correct any errors for the case if an item is discovered to be incorrect. Code 1 as indicated if review of items in the error or warning message confirms that all are correct... NAACCR Data Standards and Data Dictionary Version 11

Age/Site/Morph O/R; Arbitrary; CA; Misc; Miscellaneous; Oncology; Ordinal; Other; Point in time; QL; Qual; Qualitative; Random; Screen; 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

Age and Site and Morphology override flag Cancer caseAge/Site/Morph O/R Cancer caseAge&site&morphology override flagTUMRRGTArbPtCancer case.XXX

Frequently asked questions

Code details

Code21991-5

SystemLOINC

Display nameAge and Site and Morphology override flag Cancer case

DescriptionAge&site&morphology override flag

Short nameAge/Site/Morph O/R Cancer case

ComponentAge&site&morphology 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

Age&site&morphology override flagArbPtCancer case.XXXOrdAge and Site and Morphology 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.