diff --git a/tools/cldr-code/src/main/java/org/unicode/cldr/tool/ListRbnf.java b/tools/cldr-code/src/main/java/org/unicode/cldr/tool/ListRbnf.java
new file mode 100644
index 00000000000..5392112adef
--- /dev/null
+++ b/tools/cldr-code/src/main/java/org/unicode/cldr/tool/ListRbnf.java
@@ -0,0 +1,70 @@
+package org.unicode.cldr.tool;
+
+import com.google.common.base.Joiner;
+import com.google.common.base.Splitter;
+import com.google.common.collect.Multimap;
+import com.google.common.collect.TreeMultimap;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import java.util.Map.Entry;
+import java.util.Set;
+import java.util.TreeSet;
+import org.unicode.cldr.util.RbnfData;
+
+public class ListRbnf {
+    public static void main(String[] args) {
+        listRbnf();
+    }
+
+    public static void listRbnf() {
+        Joiner joinTab = Joiner.on('\t');
+        Joiner joinCommaSpace = Joiner.on(", ");
+        Splitter splitDash = Splitter.on('-');
+        System.out.println("\nLocale to type to subtype");
+        Set<String> keys = RbnfData.INSTANCE.getRbnfTypeToLocales().keySet();
+        System.out.println("locale\t" + joinTab.join(keys));
+
+        Multimap<String, String> typeToSubtype = TreeMultimap.create();
+
+        for (Entry<String, Multimap<String, String>> entry :
+                RbnfData.INSTANCE.getLocaleToTypesToSubtypes().entrySet()) {
+            String locale = entry.getKey();
+            List<String> row = new ArrayList<>();
+            row.add(locale);
+            for (String key : keys) {
+                Collection<String> values = entry.getValue().get(key);
+                row.add(values == null ? "" : joinCommaSpace.join(values));
+                typeToSubtype.putAll(key, values);
+            }
+            System.out.println(joinTab.join(row));
+        }
+        System.out.println("\nType to subtype");
+        Set<String> allPieces = new TreeSet<>();
+        Set<String> allSubtypes = new TreeSet<>();
+
+        for (Entry<String, Collection<String>> entry : typeToSubtype.asMap().entrySet()) {
+            Collection<String> values = entry.getValue();
+            allSubtypes.addAll(values);
+            Set<String> pieces = new TreeSet<>();
+            values.stream().forEach(x -> pieces.addAll(splitDash.splitToList(x)));
+            System.out.println(
+                    joinTab.join(
+                            entry.getKey(),
+                            joinCommaSpace.join(values),
+                            joinCommaSpace.join(pieces)));
+            allPieces.addAll(pieces);
+        }
+        System.out.println("\nAll subtypes");
+        System.out.println(joinCommaSpace.join(allSubtypes));
+
+        System.out.println("\nAll pieces");
+        System.out.println(joinCommaSpace.join(allPieces));
+
+        System.out.println("\nSubtype to locale");
+        for (Entry<String, Collection<String>> entry :
+                RbnfData.INSTANCE.getRbnfTypeToLocales().asMap().entrySet()) {
+            System.out.println(entry.getKey() + "\t" + joinCommaSpace.join(entry.getValue()));
+        }
+    }
+}
diff --git a/tools/cldr-code/src/main/java/org/unicode/cldr/util/CoreCoverageInfo.java b/tools/cldr-code/src/main/java/org/unicode/cldr/util/CoreCoverageInfo.java
index 301799cc655..b82d4143f59 100644
--- a/tools/cldr-code/src/main/java/org/unicode/cldr/util/CoreCoverageInfo.java
+++ b/tools/cldr-code/src/main/java/org/unicode/cldr/util/CoreCoverageInfo.java
@@ -52,9 +52,14 @@ public enum CoreItems {
         plurals(Level.MODERATE, Sublevel.start),
         collation(Level.MODERATE),
 
-        grammar(Level.MODERN, Sublevel.start),
+        spellout_cardinal(Level.MODERN),
+        spellout_ordinal(Level.MODERN),
+        digits_ordinals(Level.MODERN),
+
         ordinals(Level.MODERN),
         romanization(Level.MODERN),
+
+        grammar(Level.MODERN, Sublevel.start),
         ;
 
         public static final Set<CoreItems> ALL = ImmutableSet.copyOf(CoreItems.values());
@@ -102,7 +107,8 @@ public static Set<CoreItems> getCoreCoverageInfo(
             CLDRFile resolvedFile, Multimap<CoreItems, String> detailedErrors) {
         detailedErrors.clear();
         if (!resolvedFile.isResolved()) {
-            throw new IllegalArgumentException();
+            throw new IllegalArgumentException(
+                    "Don't call on unresolved locales: " + resolvedFile.getLocaleID());
         }
         CLDRFile file = resolvedFile.getUnresolved();
         String locale = file.getLocaleID();
@@ -141,6 +147,10 @@ public static Set<CoreItems> getCoreCoverageInfo(
                             + "\"]/pluralRule[@count=\"other\"]");
         }
 
+        rbnfHelper(baseLanguage, "spellout-cardinal", detailedErrors, CoreItems.spellout_cardinal);
+        rbnfHelper(baseLanguage, "spellout-ordinal", detailedErrors, CoreItems.spellout_ordinal);
+        rbnfHelper(baseLanguage, "digits-ordinal", detailedErrors, CoreItems.digits_ordinals);
+
         //      (01) Default content script and region (normally: normally country with largest
         // population using that language, and normal script for that).
         // [supplemental/supplementalMetadata.xml]
@@ -289,6 +299,26 @@ public static Set<CoreItems> getCoreCoverageInfo(
         return ImmutableSet.copyOf(Sets.difference(CoreItems.ALL, detailedErrors.keySet()));
     }
 
+    private static void rbnfHelper(
+            String stringLocale,
+            String rbnfType,
+            Multimap<CoreItems, String> detailedErrors,
+            CoreItems coreItems) {
+        CLDRLocale cldrLocale = CLDRLocale.getInstance(stringLocale);
+        while (cldrLocale != null // if either null or root, we fail
+                && !cldrLocale.equals(CLDRLocale.ROOT)) {
+            Multimap<String, String> typeInfo =
+                    RbnfData.INSTANCE.getLocaleToTypesToSubtypes().get(cldrLocale.toString());
+            if (typeInfo != null // if we succeed, just return
+                    && typeInfo.containsKey(rbnfType)) {
+                return;
+            }
+            // otherwise try the parent
+            cldrLocale = cldrLocale.getParent();
+        }
+        detailedErrors.put(coreItems, RbnfData.INSTANCE.getPath(rbnfType));
+    }
+
     private static final String[][] ROMANIZATION_PATHS = {
         {"", "-Latin"},
         {"", "-Latin-BGN"},
diff --git a/tools/cldr-code/src/main/java/org/unicode/cldr/util/RbnfData.java b/tools/cldr-code/src/main/java/org/unicode/cldr/util/RbnfData.java
new file mode 100644
index 00000000000..95b3a10d437
--- /dev/null
+++ b/tools/cldr-code/src/main/java/org/unicode/cldr/util/RbnfData.java
@@ -0,0 +1,69 @@
+package org.unicode.cldr.util;
+
+import com.google.common.collect.Multimap;
+import com.google.common.collect.TreeMultimap;
+import java.util.Map;
+import java.util.TreeMap;
+
+public enum RbnfData {
+    INSTANCE;
+
+    private final Map<String, Multimap<String, String>> localeToTypesToSubtypes;
+    private final Multimap<String, String> rbnfTypeToLocales;
+
+    {
+        Map<String, Multimap<String, String>> _localeToRbnfType = new TreeMap<>();
+        Multimap<String, String> _rbnfTypeToLocales = TreeMultimap.create();
+        Factory factory = CLDRConfig.getInstance().getRBNFFactory();
+        for (String locale : factory.getAvailable()) {
+            CLDRFile cldrFile = factory.make(locale, false);
+            Multimap<String, String> typeToSubtype = _localeToRbnfType.get(locale);
+            if (typeToSubtype == null) {
+                _localeToRbnfType.put(locale, typeToSubtype = TreeMultimap.create());
+            }
+            for (String dpath : cldrFile) {
+                String path = cldrFile.getFullXPath(dpath);
+                XPathParts parts = XPathParts.getFrozenInstance(path);
+                if (!"rbnf".equals(parts.getElement(1))
+                        || !"ruleset".equals(parts.getElement(3))
+                        || "private".equals(parts.getAttributeValue(3, "access"))) {
+                    continue;
+                }
+                String fullType = parts.getAttributeValue(3, "type");
+                String rbnfType;
+                String rbnfSubtype;
+                if (fullType.startsWith("spellout") || fullType.startsWith("digits")) {
+                    int index2 = fullType.indexOf('-', fullType.indexOf('-') + 1);
+                    if (index2 == -1) {
+                        rbnfType = fullType;
+                        rbnfSubtype = "DEFAULT";
+                    } else {
+                        rbnfType = fullType.substring(0, index2);
+                        rbnfSubtype = fullType.substring(index2 + 1);
+                    }
+                } else {
+                    rbnfType = "UNKNOWN";
+                    rbnfSubtype = fullType;
+                }
+                typeToSubtype.put(rbnfType, rbnfSubtype);
+                _rbnfTypeToLocales.put(rbnfType, locale);
+            }
+        }
+        this.localeToTypesToSubtypes = CldrUtility.protectCollection(_localeToRbnfType);
+        this.rbnfTypeToLocales = CldrUtility.protectCollection(_rbnfTypeToLocales);
+    }
+
+    public Multimap<String, String> getRbnfTypeToLocales() {
+        return rbnfTypeToLocales;
+    }
+
+    public Map<String, Multimap<String, String>> getLocaleToTypesToSubtypes() {
+        return localeToTypesToSubtypes;
+    }
+
+    public String getPath(String rbnfType) {
+        return "//ldml/rbnf/rulesetGrouping[@type=\"SpelloutRules\"]/ruleset[@type=\""
+                + rbnfType
+                + "\"]";
+    }
+}
diff --git a/tools/cldr-code/src/test/java/org/unicode/cldr/unittest/TestCoverage.java b/tools/cldr-code/src/test/java/org/unicode/cldr/unittest/TestCoverage.java
index 03901daccdc..e02247ca163 100644
--- a/tools/cldr-code/src/test/java/org/unicode/cldr/unittest/TestCoverage.java
+++ b/tools/cldr-code/src/test/java/org/unicode/cldr/unittest/TestCoverage.java
@@ -41,14 +41,14 @@ public void TestBasic() {
         Multimap<CoreItems, String> errors = LinkedHashMultimap.create();
         Set<CoreItems> coreCoverage = CoreCoverageInfo.getCoreCoverageInfo(engCldrFile, errors);
         if (!assertEquals("English should be complete", all, coreCoverage)) {
-            showDiff("Missing", all, coreCoverage);
+            showDiff("English Missing", all, coreCoverage);
         }
-        CLDRFile skimpyLocale = testInfo.getCldrFactory().make("asa", false);
+        CLDRFile skimpyLocale = testInfo.getCldrFactory().make("asa", true);
         errors.clear();
         coreCoverage = CoreCoverageInfo.getCoreCoverageInfo(skimpyLocale, errors);
         if (!assertEquals("Skimpy locale should not be complete", none, coreCoverage)) {
-            showDiff("Missing", all, coreCoverage);
-            showDiff("Extra", coreCoverage, none);
+            showDiff("Skimpy Missing", all, coreCoverage);
+            showDiff("Skimpy Extra", coreCoverage, none);
         }
     }