TOPIC
Terminology
17 entries across the knowledge base
What SNOMED CT actually isThe world's largest clinical terminology is just three building blocks — concepts, descriptions, relationships. Everything else is detail.article · 6 min · foundationValue sets & ConceptMapsCode systems don't make systems interoperable — value sets and maps do. The difference between 'which codes are allowed here' and 'what does this code mean over there'.article · 8 min · practitionerUCUM unitsOne unambiguous code for every unit of measure — because mg/dL vs mmol/L confusion is a patient-safety issue, not a formatting nit.concept · 6 min · foundationSnowstorm (SNOMED Terminology Server)SNOMED International's open-source terminology server — search, browse and query SNOMED CT with the Expression Constraint Language, behind a FHIR terminology API.concept · 6 min · foundationRefsets, extensions & SNOMED IndiaReference sets subset the terminology; national extensions add to it without forking. India's NRCeS makes SNOMED CT free in-country.reference · 8 min · expertPost-coordination & expressionsWhen no single code says it, compose one: pre-coordinated codes vs. expressions built from parts, in compositional grammar.concept · 9 min · practitionerHierarchies & is-a relationshipsEvery SNOMED concept lives in a tree of meaning. 'Is-a' links are what let one rule catch a thousand diagnoses.article · 10 min · foundationECL — querying SNOMEDExpression Constraint Language: one line that selects exactly the set of concepts you mean — subtypes, attributes, refinements and all.interactive · 12 min · practitionerConcepts, descriptions & FSNsA concept is the meaning; descriptions are its names. The FSN is the one name engineered to be unambiguous.concept · 7 min · foundationRxNormThe US normalised drug vocabulary — how it turns a thousand ways of naming the same medicine into one identifier, and why 'the same drug' is a harder question than it looks.article · 7 min · foundationLOINCThe universal codes for lab tests and observations — answering 'which question was asked?' while SNOMED answers 'what was found?'concept · 7 min · foundationICD-O — coding oncologyCancer needs two codes where everything else needs one: where the tumour is, and what it is. Why ICD-O splits topography from morphology, and what that buys.article · 6 min · practitionerICD-11WHO's classification for counting disease — fully digital, API-first, with traditional-medicine chapters that now include Ayurveda, Siddha and Unani.concept · 7 min · foundationICD-10 and ICD-10-CMOne name, two different code sets. WHO's ICD-10 is the international classification; ICD-10-CM is the United States' vastly larger clinical modification — and confusing them is a career-limiting mistake.article · 8 min · foundationCPT and HCPCSThe procedure code sets behind US outpatient billing — how the two levels fit together, and why one of them is copyrighted property rather than public infrastructure.article · 8 min · foundationATC and NDCTwo drug code systems at opposite ends of the telescope: WHO's ATC classifies medicines by what they treat and how; the US NDC identifies the exact box on the shelf.article · 6 min · foundation