SNOMED CT canonical CodeSystem resource

The FHIR specification has an incomplete canonical CodeSystem resource at https://www.hl7.org/fhir/codesystem-snomedct.html

This is something SNOMED International should really take ownership of, complete it, host it and keep it up to date...but obviously this group can help with all of that (except the hosting!).

I've included a table below which indicates the elements and their values in the current resource. The other thing to consider is the HTML rendering and what it should say, the current one you can see at https://www.hl7.org/fhir/codesystem-snomedct.html is in the current resource as generated text from the resource.

Ideally this should be hosted at http://snomed.info/sct and behave as a proper FHIR endpoint (e.g. respond appropriately to JSON and XML accept headers).

Please comment on the appropriateness of the current values and suggested changes.

Element

Value

id

snomedct

url

http://snomed.info/sct

identifier

system	urn:ietf:rfc:3986
value	urn:oid:2.16.840.1.113883.6.96

name

SNOMED CT

title

SNOMED Ct (all versions)

status

active

experimental

false

publisher

IHTSDO

contact

telecom

system	url
value	http://ihtsdo.org

description

SNOMED CT is the most comprehensive and precise clinical health terminology product in the world, owned and distributed around the world by The International Health Terminology Standards Development Organisation (IHTSDO).

copyright

© 2002-2016 International Health Terminology Standards Development Organisation (IHTSDO). All rights reserved. SNOMED CT®, was originally created by The College of American Pathologists. "SNOMED" and "SNOMED CT" are registered trademarks of the IHTSDO http://www.ihtsdo.org/snomed-ct/get-snomed-ct

caseSensitive

false

hierarchyMeaning

is-a

compositional

true

versionNeeded

false

content

not-present

filter

code

description

operator

value

concept

Filter that includes concepts based on their logical definition. e.g. [concept] [is-a] [x] - include all concepts with an is-a relationship to concept x, or [concept] [in] [x]- include all concepts in the reference set identified by concept x

is-a

in

A SNOMED CT code

expression

The result of the filter is the result of executing the given SNOMED CT Expression Constraint

=

A SNOMED CT ECL expression (see ecl)

expressions

Whether post-coordinated expressions are included in the value set

=

true or false

property

code	uri	description	type
inactive	http://snomed.info/field/Concept.active	Whether the code is active or not (defaults to false). Not the same as deprecated	boolean
definitionStatusId	http://snomed.info/field/Concept.definitionStatusId	Either of the codes that are descendants of 900000000000444006	code
parent	????	A SNOMED CT concept id that has the target of a direct is-a relationship from the concept	code
child	????	A SNOMED CT concept id that has a direct is-a relationship to the concept	code
moduleId	http://snomed.info/field/Concept.moduleId	The SNOMED CT concept id of the module that the concept belongs to.	code
normalForm	????	Generated Normal form expression for the provided code or expression, with terms	string
normalFormTerse	????	Generated Normal form expression for the provided code or expression, conceptIds only	string

There is also listed the attributes used in SNOMED CT, a couple of examples to express the pattern are

code	uri	type
Due to	http://snomed.info/id/42752001	code
Associated with	http://snomed.info/id/47429007	code

Additional elements worth considering populating are

date - date of last change to the resource
purpose - why is this code system defined
valueSet - Canonical URL for the value set with the entire code system

Another thing to consider is whether the valueSet, if it can exist, if theoretically expanded would return all of SNOMED CT International Edition or the SNOMED CT "Universal" Edition

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