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→READ and SNOMED: Read is a name not an abbrevation |
→READ version 3 (Clinical Terms Version 3 or 'CTV3'): Read is a name not an abbreviation |
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In 1988 a joint conference of the [[Royal College of General Practitioners]] and the [[British Medical Association]] recommended standardisation of the system in general practice [[Electronic medical record|Electronic Medical Record (EMR)]] systems and the [[National Health Service]] mandated this in April 1999.<ref name="NHS-CfH">{{cite web |title=Frequently Asked Questions about Clinical Terms (The Read Codes) |url=http://www.connectingforhealth.nhs.uk/systemsandservices/data/readcodes/faqs/index_html#1 |publisher=NHS Connecting for Health |accessdate=2010-04-17}}</ref> The intellectual property of the codes themselves was purchased outright by the UK government, and they have therefore been published under [[Crown Copyright]] ever since.
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A third and more radically progressive version was devised through the 1990s in an attempt to address some of the more serious technical limitations of the earlier designs, including:
* Although codes remain 5-bytes in length, the hierarchical relationship between codes is no longer represented through the codes themselves but rather through a separate table listing all binary parent-child relations; this allows for a [[polyhierarchy]] of indefinite depth.
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