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Action itemjoint-iso-itu-t(2) Action itemcountry(16) Action itemus(840) Action itemorganization(1) Action itemhl7(113883) Action itemexternalCodeSystems(6)  

Navigating the OID tree

child OIDs: Child OID separator mDRAE(1) Child OID separator mDRDUT(2) Child OID separator mDRFRE(3) Child OID separator mDRGER(4) Child OID separator mDRPOR(5) Child OID separator mDRSPA(6) Child OID separator
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OID description

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(OID-IRI notation)




MedDRA is a five-level hierarchy of terms, developed as an Institute for Community Health (ICH) initiative, and maintained and distributed by the MedDRA Maintenance and Support Services Organization (MSSO).

Concepts are represented by a MedDRA code and a MedDRA term name. The MedDRA code is an eight digit numeric code. MedDRA codes are unique and are never reused. The MedDRA term name is a 100 character alphanumeric field used to describe the concept or term.

MedDRA is structured as a five level hierarchy. System Organ Classes (SOCs) are the broadest terms (e.g., Cardiac disorders, Investigations). The lowest level of the terminology is the Lowest Level Term (LLT) level. There are 26 SOCs and over 60,000 LLTs.

See also the Health Level 7 OID Registry.

Current Registration Authority    


Elizabeth A. D'Alelio

To contact the registration authority, replace "&" by "@" in the email address


12011 Sunset Hills Rd
VAR1 7B52, Reston, VA 20190
United States (the)


+1 703 345 7722

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Disclaimer: The owner of this site does not warrant or assume any liability or responsibility for the accuracy, completeness, or usefulness of any information available on this page (for more information, please read the complete disclaimer).
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Tree display Parent OID: externalCodeSystems(6) First child OID: mDRAE(1) First sibling OID: 1 Previous sibling OID: mcm(161) Next sibling OID: mDREX(164) Last sibling OID: 349
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OID helper Webmaster Bullet 20 Jan 2017 Bullet Page top