<?xml version="1.0" encoding="UTF-8"?><CodeSystem xmlns="http://hl7.org/fhir"><id value="vision-base-codes"/><meta><lastUpdated value="2026-03-31T18:55:04.283+00:00"/></meta><text><status value="generated"/><div xmlns="http://www.w3.org/1999/xhtml"><p class="res-header-id"><b>Generated Narrative: CodeSystem vision-base-codes</b></p><a name="vision-base-codes"> </a><a name="hcvision-base-codes"> </a><p>This case-sensitive code system <code>http://hl7.org/fhir/vision-base-codes</code> defines the following codes:</p><table class="codes"><tr><td style="white-space:nowrap"><b>Code</b></td><td><b>Display</b></td><td><b>Definition</b></td></tr><tr><td style="white-space:nowrap">up<a name="vision-base-codes-up"> </a></td><td>Up</td><td>top.</td></tr><tr><td style="white-space:nowrap">down<a name="vision-base-codes-down"> </a></td><td>Down</td><td>bottom.</td></tr><tr><td style="white-space:nowrap">in<a name="vision-base-codes-in"> </a></td><td>In</td><td>inner edge.</td></tr><tr><td style="white-space:nowrap">out<a name="vision-base-codes-out"> </a></td><td>Out</td><td>outer edge.</td></tr></table></div></text><extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg"><valueCode value="oo"/></extension><extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status"><valueCode value="normative"/></extension><extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm"><valueInteger value="3"/></extension><url value="http://hl7.org/fhir/vision-base-codes"/><identifier><system value="urn:ietf:rfc:3986"/><value value="urn:oid:2.16.840.1.113883.4.642.4.663"/></identifier><identifier><use value="old"/><system value="urn:ietf:rfc:3986"/><value value="urn:oid:2.16.840.1.113883.4.642.1.647"/></identifier><identifier><use value="old"/><system value="urn:ietf:rfc:3986"/><value value="urn:oid:2.16.840.1.113883.4.642.2.345"/></identifier><version value="6.0.0-ballot4"/><name value="VisionBase"/><title value="Vision Base"/><status value="active"/><experimental value="false"/><date value="2021-01-05T10:01:24+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="A coded concept listing the base codes."/><jurisdiction><coding><system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/><code value="001"/><display value="World"/></coding></jurisdiction><caseSensitive value="true"/><valueSet value="http://hl7.org/fhir/ValueSet/vision-base-codes"/><content value="complete"/><concept><code value="up"/><display value="Up"/><definition value="top."/></concept><concept><code value="down"/><display value="Down"/><definition value="bottom."/></concept><concept><code value="in"/><display value="In"/><definition value="inner edge."/></concept><concept><code value="out"/><display value="Out"/><definition value="outer edge."/></concept></CodeSystem>