Terminologies and Classifications

Classifications and Terminologies Working Group (CTWG) - Committee of the Australian National Health Information Group (NHIG) with responsibilities for endorsing and monitoring the stability and viability of health classifications and terminologies within Australia. Details of membership, informatics resources, terms of reference, contact information and publications provided.
http://www.aihw.gov.au/committees/ctwg/

OpenGALEN - An open source terminology with tools, expertise and experience in building and delivering a multiaxial medical concept model and terminology.
http://www.opengalen.org/

Unified Medical Language System (UMLS) - Metathesaurus and semantic network with lexical applications that can be used to overcome problems caused by differences in terminology and scattering of related information across databases. Includes FAQs, documentation, papers, license agreements, knowledge source server, bibliography and details of applications. (Custodians are the National Library of Medicine)
http://www.nlm.nih.gov/research/umls/

Logical Observation Identifiers Names and Codes (LOINC) - Dataset of universal identifiers for laboratory and other clinical observations to facilitate exchange and storage of clinical results or vital signs for patient care and research. Includes downloads, news, meetings, background, articles, e-mail list and submissions. Links to its custodians the Regenstrief Institute.
http://loinc.org/

National Centre for Classification in Health - Australian centre of excellence in health classification theory and an expert centre in clinical coding systems. (Home of ICD10-AM).
http://www2.fhs.usyd.edu.au/ncch/