diff --git a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/i18n/subtag/LanguageSubtagRegistryLoader.java b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/i18n/subtag/LanguageSubtagRegistryLoader.java
index 17ed2b876..9ee3cc8f4 100644
--- a/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/i18n/subtag/LanguageSubtagRegistryLoader.java
+++ b/org.hl7.fhir.utilities/src/main/java/org/hl7/fhir/utilities/i18n/subtag/LanguageSubtagRegistryLoader.java
@@ -1,5 +1,8 @@
 package org.hl7.fhir.utilities.i18n.subtag;
 
+import lombok.Getter;
+import lombok.With;
+
 import java.io.IOException;
 import java.io.InputStream;
 import java.net.URL;
@@ -7,6 +10,24 @@ import java.util.*;
 
 public class LanguageSubtagRegistryLoader {
 
+  @Getter
+  private final LanguageSubtagRegistry registry;
+
+  @With
+  private final boolean loadLanguages;
+
+  @With
+  private final boolean loadScripts;
+
+  @With
+  private final boolean loadExtLangs;
+
+  @With
+  private final boolean loadRegions;
+
+  @With
+  private final boolean loadVariants;
+
   public static boolean isMultiField(String field){
     return DESCRIPTION.equals(field)
       || COMMENTS.equals(field)
@@ -58,12 +79,19 @@ public class LanguageSubtagRegistryLoader {
 
   public static final String GRANDFATHERED = "grandfathered";
 
-  private final LanguageSubtagRegistry registry;
 
   public LanguageSubtagRegistryLoader(LanguageSubtagRegistry registry) {
-    this.registry = registry;
+   this(registry, true, true, true, true, true);
   }
 
+  private LanguageSubtagRegistryLoader(LanguageSubtagRegistry registry, boolean loadLanguages, boolean loadScripts, boolean loadExtLangs, boolean loadRegions, boolean loadVariants) {
+    this.registry = registry;
+    this.loadLanguages = loadLanguages;
+    this.loadScripts = loadScripts;
+    this.loadExtLangs = loadExtLangs;
+    this.loadRegions = loadRegions;
+    this.loadVariants = loadVariants;
+  }
   public void loadFromDefaultResource() throws IOException {
     loadFromResource("lang.dat.txt");
   }
@@ -140,15 +168,15 @@ public class LanguageSubtagRegistryLoader {
 
   protected void addSubtag(Subtag subtag) {
     assert subtag.getSubtag() != null;
-    if (subtag instanceof LanguageSubtag)
+    if (subtag instanceof LanguageSubtag && loadLanguages)
       registry.addLanguage(subtag.getSubtag(), (LanguageSubtag) subtag);
-    else if (subtag instanceof  ExtLangSubtag)
+    else if (subtag instanceof  ExtLangSubtag && loadExtLangs )
      registry.addExtLang(subtag.getSubtag(), (ExtLangSubtag) subtag);
-    else if (subtag instanceof ScriptSubtag)
+    else if (subtag instanceof ScriptSubtag && loadScripts)
       registry.addScript(subtag.getSubtag(), (ScriptSubtag) subtag);
-    else if (subtag instanceof RegionSubtag)
+    else if (subtag instanceof RegionSubtag && loadRegions)
       registry.addRegion(subtag.getSubtag(), (RegionSubtag) subtag);
-    else if (subtag instanceof VariantSubtag)
+    else if (subtag instanceof VariantSubtag && loadVariants)
       registry.addVariant(subtag.getSubtag(), (VariantSubtag) subtag);
   }
   protected Subtag processVariantRecord(Record record) {
diff --git a/org.hl7.fhir.utilities/src/test/java/org/hl7/fhir/utilities/i18n/subtag/LanguageSubtagRegistryTest.java b/org.hl7.fhir.utilities/src/test/java/org/hl7/fhir/utilities/i18n/subtag/LanguageSubtagRegistryLoaderTest.java
similarity index 68%
rename from org.hl7.fhir.utilities/src/test/java/org/hl7/fhir/utilities/i18n/subtag/LanguageSubtagRegistryTest.java
rename to org.hl7.fhir.utilities/src/test/java/org/hl7/fhir/utilities/i18n/subtag/LanguageSubtagRegistryLoaderTest.java
index a6c8c9467..f55242f10 100644
--- a/org.hl7.fhir.utilities/src/test/java/org/hl7/fhir/utilities/i18n/subtag/LanguageSubtagRegistryTest.java
+++ b/org.hl7.fhir.utilities/src/test/java/org/hl7/fhir/utilities/i18n/subtag/LanguageSubtagRegistryLoaderTest.java
@@ -1,15 +1,19 @@
 package org.hl7.fhir.utilities.i18n.subtag;
 
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
 
 import java.io.IOException;
+import java.util.stream.Stream;
 
 import static org.junit.jupiter.api.Assertions.*;
 
-public class LanguageSubtagRegistryTest {
+public class LanguageSubtagRegistryLoaderTest {
 
   @Test
-  public void initializationTest() throws IOException {
+  public void defaultLoaderTest() throws IOException {
     /*
     languages.size(): 8259
     extLangs.size(): 253
@@ -21,7 +25,7 @@ public class LanguageSubtagRegistryTest {
     LanguageSubtagRegistry registry = new LanguageSubtagRegistry();
     LanguageSubtagRegistryLoader loader = new LanguageSubtagRegistryLoader(registry);
     loader.loadFromDefaultResource();
-    
+
     /*  Test entries of every subtag type (language, script, variant, extLang, region)
         These should cover both simple, and more complex entries with a larger number
         of fields.
@@ -186,4 +190,53 @@ public class LanguageSubtagRegistryTest {
     assertEquals("Honduras", hn.getDescriptions().get(0));
     assertEquals("2005-10-16", hn.getAdded());
   }
+
+  @Test
+  public void testNoLanguagesLoading() throws IOException {
+    LanguageSubtagRegistry registry = new LanguageSubtagRegistry();
+    LanguageSubtagRegistryLoader loader = new LanguageSubtagRegistryLoader(registry).withLoadLanguages(false);
+
+    loader.loadFromDefaultResource();
+
+    assertTrue(registry.getLanguageKeys().isEmpty());
+    assertFalse(registry.getExtLangKeys().isEmpty());
+    assertFalse(registry.getRegionKeys().isEmpty());
+    assertFalse(registry.getVariantKeys().isEmpty());
+    assertFalse(registry.getScriptKeys().isEmpty());
+  }
+
+  @Test
+  public void testNoExtLangsLoading() throws IOException {
+    LanguageSubtagRegistry registry = new LanguageSubtagRegistry();
+    LanguageSubtagRegistryLoader loader = new LanguageSubtagRegistryLoader(new LanguageSubtagRegistry()).withLoadExtLangs(false);
+
+
+  }
+
+  private static Stream<Arguments> provideParamsForPartialLoad() {
+    return Stream.of(
+      Arguments.of(new LanguageSubtagRegistryLoader(new LanguageSubtagRegistry()).withLoadLanguages(false), true, false, false, false, false),
+      Arguments.of(new LanguageSubtagRegistryLoader(new LanguageSubtagRegistry()).withLoadExtLangs(false), false, true, false, false, false),
+      Arguments.of(new LanguageSubtagRegistryLoader(new LanguageSubtagRegistry()).withLoadRegions(false), false, false, true, false, false),
+      Arguments.of(new LanguageSubtagRegistryLoader(new LanguageSubtagRegistry()).withLoadVariants(false), false, false, false, true, false),
+      Arguments.of(new LanguageSubtagRegistryLoader(new LanguageSubtagRegistry()).withLoadScripts(false), false, false, false, false, true)
+    );
+  }
+
+  @ParameterizedTest
+  @MethodSource("provideParamsForPartialLoad")
+  public void testPartialLoad(LanguageSubtagRegistryLoader loader,
+                                  boolean languagesEmpty,
+                                  boolean extLangsEmpty,
+                                  boolean regionsEmpty,
+                                  boolean variantsEmpty,
+                                  boolean scriptsEmpty) throws IOException {
+    loader.loadFromDefaultResource();
+
+    assertEquals(languagesEmpty, loader.getRegistry().getLanguageKeys().isEmpty());
+    assertEquals(extLangsEmpty, loader.getRegistry().getExtLangKeys().isEmpty());
+    assertEquals(regionsEmpty, loader.getRegistry().getRegionKeys().isEmpty());
+    assertEquals(variantsEmpty, loader.getRegistry().getVariantKeys().isEmpty());
+    assertEquals(scriptsEmpty, loader.getRegistry().getScriptKeys().isEmpty());
+  }
 }