diff --git a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/i18n/I18nConstants.java b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/i18n/I18nConstants.java
index 378547f2e..77f2afc9b 100644
--- a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/i18n/I18nConstants.java
+++ b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/i18n/I18nConstants.java
@@ -942,6 +942,7 @@ public class I18nConstants {
   public static final String LIQUID_SYNTAX_UNEXPECTED = "LIQUID_SYNTAX_UNEXPECTED";
   public static final String LIQUID_VARIABLE_ALREADY_ASSIGNED = "LIQUID_VARIABLE_ALREADY_ASSIGNED";
   public static final String LIQUID_VARIABLE_ILLEGAL = "LIQUID_VARIABLE_ILLEGAL";
+  public static final String TERMINOLOGY_TX_SYSTEM_NOT_USABLE = "TERMINOLOGY_TX_SYSTEM_NOT_USABLE";
 
 
 
diff --git a/org.hl7.fhir.utilities/src/main/resources/Messages.properties b/org.hl7.fhir.utilities/src/main/resources/Messages.properties
index 34cbf51a4..530ec44f4 100644
--- a/org.hl7.fhir.utilities/src/main/resources/Messages.properties
+++ b/org.hl7.fhir.utilities/src/main/resources/Messages.properties
@@ -184,6 +184,7 @@ Terminology_TX_NoValid_8 = None of the codes provided are in the maximum value s
 Terminology_TX_NoValid_9 = The code provided ({2}) could not be validated against the maximum value set {0}, (error = {1})
 Terminology_TX_System_Invalid = Invalid System URI: {0}
 Terminology_TX_System_NotKnown = Code System URI ''{0}'' is unknown so the code cannot be validated
+TERMINOLOGY_TX_SYSTEM_NOT_USABLE = Code System with URI ''{0}'' has no content so the code cannot be validated
 Terminology_TX_System_Relative = Coding.system must be an absolute reference, not a local reference
 Terminology_TX_System_Unknown = Unknown Code System ''{0}''
 Terminology_TX_System_ValueSet = Invalid System URI: {0} - cannot use a value set URI as a system
diff --git a/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/instance/InstanceValidator.java b/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/instance/InstanceValidator.java
index a2391d32a..206a72cfc 100644
--- a/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/instance/InstanceValidator.java
+++ b/org.hl7.fhir.validation/src/main/java/org/hl7/fhir/validation/instance/InstanceValidator.java
@@ -113,6 +113,7 @@ import org.hl7.fhir.r5.model.ElementDefinition.PropertyRepresentation;
 import org.hl7.fhir.r5.model.ElementDefinition.TypeRefComponent;
 import org.hl7.fhir.r5.model.Enumeration;
 import org.hl7.fhir.r5.model.Enumerations.BindingStrength;
+import org.hl7.fhir.r5.model.Enumerations.CodeSystemContentMode;
 import org.hl7.fhir.r5.model.ExpressionNode;
 import org.hl7.fhir.r5.model.ExpressionNode.CollectionStatus;
 import org.hl7.fhir.r5.model.Extension;
@@ -1075,7 +1076,14 @@ public class InstanceValidator extends BaseValidator implements IResourceValidat
           }           
         } 
         if (!isAllowExamples() || !Utilities.startsWithInList(system, "http://example.org", "https://example.org")) {
-          hint(errors, NO_RULE_DATE, IssueType.UNKNOWN, element.line(), element.col(), path, done, I18nConstants.TERMINOLOGY_TX_SYSTEM_NOTKNOWN, system);
+          CodeSystem cs = context.fetchCodeSystem(system);
+          if (cs == null) {
+            hint(errors, NO_RULE_DATE, IssueType.UNKNOWN, element.line(), element.col(), path, done, I18nConstants.TERMINOLOGY_TX_SYSTEM_NOTKNOWN, system);
+          } else {
+            if (hint(errors, NO_RULE_DATE, IssueType.UNKNOWN, element.line(), element.col(), path, cs.getContent() != CodeSystemContentMode.NOTPRESENT, I18nConstants.TERMINOLOGY_TX_SYSTEM_NOT_USABLE, system)) {
+              rule(errors, NO_RULE_DATE, IssueType.UNKNOWN, element.line(), element.col(), path, false, "Error - this should not happen? (Consult GG)"); 
+            }
+          }
         }
         return true;
       } catch (Exception e) {