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==History==
Since its origins in the 1980s,<ref>{{cite journal|last=Benson |first=Tim |title=The history of the Read codes: the inaugural James Read Memorial Lecture 2011 |journal=Informatics in primary care |volume=19 |issue=3 |date=2011 |pages=173-182 |doi=10.14236/jhi.v19i3.811|doi-access=free }}</ref> the system has evolved through three major technical design changes and significantly expanded its content.
===Read version 1 (4-byte Read)===
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==Production and license==
In the 1990s the Read codes were released on a quarterly basis for clinical terms, and monthly for drugs and appliances.<ref>{{cite journal|last1=Robinson |first1=David |last2=Schulz |first2=Erich |last3=Brown |first3=Philip |last4=Price |first4=Colin |title= Updating the Read Codes. User-interactive Maintenance of a Dynamic Clinical Vocabulary |journal=Journal of the American Medical Informatics Association |volume=4 |issue=6 |date=1997 |pages=465–472 |doi=10.1136/jamia.1997.0040465|doi-access=free }}</ref> Laterly, they were maintained by the UK Terminology Centre, a division within NHS Data Standards and Products (in turn a division of [[NHS Connecting for Health]]) and both versions were released biannually, in October and April, under the [[Open Government Licence]].<ref>{{cite web|url=https://data.gov.uk/dataset/f262aa32-9c4e-44f1-99eb-4900deada7a4/uk-read-code |title=UK Read Code |website=data.gov.uk |publisher=[[UK Government]] |accessdate=18 March 2020}}</ref>
License application, and distribution, are now electronic only via the UKTC [https://www.uktcregistration.nss.cfh.nhs.uk Terminology Reference data Update Distribution] service.
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