LOINC Code 21990-7: ICD-O-1 to ICD-O-2 conversion method
21990-7 is a LOINC code used to identify ICD-O-1 to ICD-O-2 conversion method 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 ICD-O-1 to ICD-O-2 conversion method. It is commonly used with the system or sample type Cancer.XXX.
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 ICD-O-1 to ICD-O-2 conversion method. It is commonly used with the system or sample type Cancer.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
- ICD-O-1 to ICD-O-2 conversion method
- Code specifying how the conversion of site and morphology codes from ICD-O-1 and the field trial editions to ICD-O-2 was accomplished. The item names include years 1973-91. However, some states may have used the codes for tumors before 1973. The code also covers morphology conversions from ICD-O-3 to ICD-O-2... NAACCR Data Standards and Data Dictionary Version 11
- CA; i; ICD-O-1 to ICD-O-2 conv method; II; International Classification of Diseases; International Classification of Diseases for Oncology; Meth; Method of; Misc; Miscellaneous; Nominal; Other; Point in time; Random; Spec; To be specified in another part of the message; TUMOR REGISTRY(NAACCR); Typ; 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
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.