Topic

Clinical Terminology & Coding

Clinical terminology is what makes a coded field mean the same thing in two different systems. A code system is the dictionary, a value set is the governed shortlist for one specific context, and a concept map is the translation between two shortlists. These articles cover all three, and the governance that stops them drifting.

Clinical Terminology & Coding
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Preview card for the article: Making SNOMED CT and your local Trust codes work together: a terminology governance guide
Preview card for the article: SNOMED CT explained: what it is and how it differs from ICD-10
Preview card for the article: Terminology 101: code systems, value sets and concept maps, in plain English

Common questions

Is SNOMED CT a value set?
No. SNOMED CT is a code system, the dictionary. Value sets are curated selections drawn from it for a specific context, such as one form field or one message element. Binding and validation should always happen at value set level, never against a whole code system.
How do local Trust codes fit alongside SNOMED CT?
They belong in the same machinery: hosted as first-class code systems, versioned, owned, and reachable by the same runtime operations. The goal is not zero local codes, which is unachievable. It is zero ungoverned codes.

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