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 21997-2: Report source override flag Cancer case

Name: LOINC Code 21997-2: Report source override flag Cancer case
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:30.108Z

21997-2 is a LOINC code used to identify Report source 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 Report source 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 Report source 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

Report source override flag Cancer case

Report source 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 softwareType of Report Srce(DC),Seq Num--Cent (NAACCR IF04) Type of Report Srce(DC),Seq Num--Central (SEER IF04) Type of Rep Srce(DC),Seq Num--Cent, ICDO3 (NAACCR) Type of Rep Srce(DC),Seq Num--Cent, ICDO3 (SEER IF04) 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 Date Edits and Software Coordination of Standards. Over-ride Flag as Used in the EDITS Software Package The edit Report Source checks that if the case is a death-certificate-only case and the histology is not a lymphoma, leukemia, immunoproliferative or myeloproliferative disease (morphology is less than 9590), then the tumor sequence number must specify one primary only (sequence '00'). Instructions for Coding Leave blank if the program does not generate an error message for the report source edit. Code 1 if review of type of reporting source, histologic type and tumor sequence number verified that a second or subsequent primary with a reporting source of death-certificate-only has been reviewed and is indeed an independent primary... NAACCR Data Standards and Data Dictionary Version 11

Arbitrary; CA; Misc; Miscellaneous; Oncology; Ordinal; Other; Point in time; QL; Qual; Qualitative; Random; Report source O/R; Screen; Spec; Srce; 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

Report source override flag Cancer caseReport source O/R Cancer caseReport source override flagTUMRRGTArbPtCancer case.XXX

Frequently asked questions

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.

LOINC Code 21997-2: Report source override flag Cancer case

What is this code?

When is it used?

What it does not mean

Key facts

Where you may see this code

Common synonyms

Frequently asked questions

Code details

Flags

Source

Part names