This case-sensitive code system http://terminology.hl7.org/CodeSystem/certainty-subcomponent-rating defines the following codes:

CodeDisplayDefinition
no-change no change to ratingno change to quality rating.
downcode1 reduce rating: -1reduce quality rating by 1.
downcode2 reduce rating: -2reduce quality rating by 2.
downcode3 reduce rating: -3reduce quality rating by 3.
upcode1 increase rating: +1increase quality rating by 1.
upcode2 increase rating: +2increase quality rating by 2.
no-concern no serious concernno serious concern.
serious-concern serious concernserious concern.
critical-concern critical concerncritical concern.
present presentpossible reason for increasing quality rating was checked and found to bepresent.
absent absentpossible reason for increasing quality rating was checked and found to be absent.
<status value="draft"/> <experimental value="false"/> <date value="2020-04-09T21:10:28+00:00"/> <publisher value="Health Level Seven International"/> <contact> <telecom> <system value="url"/> <value value="http://hl7.org"/> </telecom> <telecom> <system value="email"/> <value value="hq@HL7.org"/> </telecom> </contact> <description value="The quality rating of the subcomponent of a quality of evidence rating."/> <copyright value="This material derives from the HL7 Terminology (THO). THO is copyright ©1989+ Health Level Seven International and is made available under the CC0 designation. For more licensing information see: https://terminology.hl7.org/license"/> <caseSensitive value="true"/> <valueSet value="http://terminology.hl7.org/ValueSet/certainty-subcomponent-rating"/> <content value="complete"/> <concept> <code value="no-change"/> <display value="no change to rating"/> <definition value="no change to quality rating."/> </concept> <concept> <code value="downcode1"/> <display value="reduce rating: -1"/> <definition value="reduce quality rating by 1."/> </concept> <concept> <code value="downcode2"/> <display value="reduce rating: -2"/> <definition value="reduce quality rating by 2."/> </concept> <concept> <code value="downcode3"/> <display value="reduce rating: -3"/> <definition value="reduce quality rating by 3."/> </concept> <concept> <code value="upcode1"/> <display value="increase rating: +1"/> <definition value="increase quality rating by 1."/> </concept> <concept> <code value="upcode2"/> <display value="increase rating: +2"/> <definition value="increase quality rating by 2."/> </concept> <concept> <code value="no-concern"/> <display value="no serious concern"/> <definition value="no serious concern."/> </concept> <concept> <code value="serious-concern"/> <display value="serious concern"/> <definition value="serious concern."/> </concept> <concept> <code value="critical-concern"/> <display value="critical concern"/> <definition value="critical concern."/> </concept> <concept> <code value="present"/> <display value="present"/> <definition value="possible reason for increasing quality rating was checked and found to bepresent."/> </concept> <concept> <code value="absent"/> <display value="absent"/> <definition value="possible reason for increasing quality rating was checked and found to be absent."/> </concept> </CodeSystem>