This code system http://terminology.hl7.org/CodeSystem/cited-artifact-part-type defines the following codes:

Code Display Definition
pages pages Denotes specific page or pages of an article or artifact.
sections sections Denotes specific section or sections of an article or artifact.
paragraphs paragraphs Denotes specific paragraph or paragraphs of an article or artifact.
lines lines Denotes specific line or lines of an article or artifact.
tables tables Denotes specific table or tables of an article or artifact.
figures figures Denotes specific figure or figures of an article or artifact.
supplement Supplement or Appendix Used to denote a supplementary file, appendix, or additional part that is not a subpart of the primary article.
supplement-subpart Supplement or Appendix Subpart Used to denote a subpart within a supplementary file or appendix.
article-set Part of an article set Used to distinguish an individual article within an article set where the article set is a base citation.
<status value="draft"/><experimental value="false"/><date value="2020-12-28T16:55:11+11:00"/><publisher value="HL7 (FHIR Project)"/><contact><telecom><system value="url"/><value value="http://hl7.org/fhir"/></telecom><telecom><system value="email"/><value value="fhir@lists.hl7.org"/></telecom></contact><description value="To describe the reason for the variant citation, such as version number or subpart specification."/><caseSensitive value="true"/><valueSet value="http://hl7.org/fhir/ValueSet/cited-artifact-part-type"/><content value="complete"/><concept><code value="pages"/><display value="pages"/><definition value="Denotes specific page or pages of an article or artifact."/></concept><concept><code value="sections"/><display value="sections"/><definition value="Denotes specific section or sections of an article or artifact."/></concept><concept><code value="paragraphs"/><display value="paragraphs"/><definition value="Denotes specific paragraph or paragraphs of an article or artifact."/></concept><concept><code value="lines"/><display value="lines"/><definition value="Denotes specific line or lines of an article or artifact."/></concept><concept><code value="tables"/><display value="tables"/><definition value="Denotes specific table or tables of an article or artifact."/></concept><concept><code value="figures"/><display value="figures"/><definition value="Denotes specific figure or figures of an article or artifact."/></concept><concept><code value="supplement"/><display value="Supplement or Appendix"/><definition value="Used to denote a supplementary file, appendix, or additional part that is not a subpart of the primary article."/></concept><concept><code value="supplement-subpart"/><display value="Supplement or Appendix Subpart"/><definition value="Used to denote a subpart within a supplementary file or appendix."/></concept><concept><code value="article-set"/><display value="Part of an article set"/><definition value="Used to distinguish an individual article within an article set where the article set is a base citation."/></concept></CodeSystem>