diff --git a/modules/core/validation/models.js b/modules/core/validation/models.js
index 74224ce5a..1b5ac4e71 100644
--- a/modules/core/validation/models.js
+++ b/modules/core/validation/models.js
@@ -3,6 +3,7 @@ import { osmEntity } from '../../osm/entity';
 
 export function validationIssue(attrs) {
     this.type = attrs.type;                // required - name of rule that created the issue (e.g. 'missing_tag')
+    this.subtype = attrs.subtype;          // optional - category of the issue within the type (e.g. 'relation_type' under 'missing_tag')
     this.severity = attrs.severity;        // required - 'warning' or 'error'
     this.message = attrs.message;          // required - localized string
     this.reference = attrs.reference;      // optional - function(selection) to render reference information
diff --git a/modules/ui/commit.js b/modules/ui/commit.js
index 94b6e3b00..a8602635f 100644
--- a/modules/ui/commit.js
+++ b/modules/ui/commit.js
@@ -132,7 +132,15 @@ export function uiCommit(context) {
 
         var warningsByType = utilArrayGroupBy(warnings, 'type');
         for (var warningType in warningsByType) {
-            tags['warnings:' + warningType] = warningsByType[warningType].length.toString();
+            var warningsOfType = warningsByType[warningType];
+            tags['warnings:' + warningType] = warningsOfType.length.toString();
+            if (warningsOfType[0].subtype) {
+                var warningsBySubtype = utilArrayGroupBy(warningsOfType, 'subtype');
+                for (var warningSubtype in warningsBySubtype) {
+                    var warningsOfSubtype = warningsBySubtype[warningSubtype];
+                    tags['warnings:' + warningType + ':' + warningSubtype] = warningsOfSubtype.length.toString();
+                }
+            }
         }
 
 
diff --git a/modules/validations/missing_tag.js b/modules/validations/missing_tag.js
index 8a953aee5..a498f7ec6 100644
--- a/modules/validations/missing_tag.js
+++ b/modules/validations/missing_tag.js
@@ -45,16 +45,21 @@ export function validationMissingTag() {
 
         var messageObj = {};
         var missingTagType;
+        var subtype;
 
         if (Object.keys(entity.tags).length === 0) {
             missingTagType = 'any';
+            subtype = 'any';
         } else if (!hasDescriptiveTags(entity)) {
             missingTagType = 'descriptive';
+            subtype = 'descriptive';
         } else if (isUntypedRelation(entity)) {
             missingTagType = 'specific';
             messageObj.tag = 'type';
+            subtype = 'relation_type';
         } else if (isUnknownRoad(entity)) {
             missingTagType = 'unknown_road';
+            subtype = 'highway_classification';
         }
 
         if (!missingTagType) return [];
@@ -101,9 +106,10 @@ export function validationMissingTag() {
         var referenceID = missingTagType === 'unknown_road' ? 'unknown_road' : 'missing_tag';
 
         var severity = (canDelete && missingTagType !== 'unknown_road') ? 'error' : 'warning';
-        
+
         return [new validationIssue({
             type: type,
+            subtype: subtype,
             severity: severity,
             message: t('issues.' + messageID + '.message', messageObj),
             reference: showReference,
diff --git a/modules/validations/outdated_tags.js b/modules/validations/outdated_tags.js
index 4ceaecf88..a17156a79 100644
--- a/modules/validations/outdated_tags.js
+++ b/modules/validations/outdated_tags.js
@@ -14,6 +14,8 @@ export function validationOutdatedTags() {
         var graph = context.graph();
         var oldTags = Object.assign({}, entity.tags);  // shallow copy
         var preset = context.presets().match(entity, graph);
+        var explicitPresetUpgrade = preset.replacement;
+        var subtype = 'deprecated_tags';
 
         // upgrade preset..
         if (preset.replacement) {
@@ -38,6 +40,9 @@ export function validationOutdatedTags() {
             Object.keys(preset.addTags).forEach(function(k) {
                 if (!newTags[k]) {
                     newTags[k] = preset.addTags[k];
+                    if (!explicitPresetUpgrade) {
+                        subtype = 'incomplete_tags';
+                    }
                 }
             });
         }
@@ -61,6 +66,7 @@ export function validationOutdatedTags() {
 
         return [new validationIssue({
             type: type,
+            subtype: subtype,
             severity: 'warning',
             message: t('issues.outdated_tags.message', { feature: utilDisplayLabel(entity, context) }),
             reference: showReference,
@@ -133,6 +139,7 @@ export function validationOutdatedTags() {
         var multipolygonLabel = utilDisplayLabel(multipolygon, context);
         return [new validationIssue({
             type: type,
+            subtype: 'old_multipolygon',
             severity: 'warning',
             message: t('issues.old_multipolygon.message', { multipolygon: multipolygonLabel }),
             reference: showReference,
diff --git a/test/spec/validations/missing_tag.js b/test/spec/validations/missing_tag.js
index cad1fa01a..42dbb63a2 100644
--- a/test/spec/validations/missing_tag.js
+++ b/test/spec/validations/missing_tag.js
@@ -67,6 +67,7 @@ describe('iD.validations.missing_tag', function () {
         expect(issues).to.have.lengthOf(1);
         var issue = issues[0];
         expect(issue.type).to.eql('missing_tag');
+        expect(issue.subtype).to.eql('any');
         expect(issue.entities).to.have.lengthOf(1);
         expect(issue.entities[0].id).to.eql('w-1');
     });
@@ -77,6 +78,7 @@ describe('iD.validations.missing_tag', function () {
         expect(issues).to.have.lengthOf(1);
         var issue = issues[0];
         expect(issue.type).to.eql('missing_tag');
+        expect(issue.subtype).to.eql('descriptive');
         expect(issue.entities).to.have.lengthOf(1);
         expect(issue.entities[0].id).to.eql('w-1');
     });
@@ -87,6 +89,7 @@ describe('iD.validations.missing_tag', function () {
         expect(issues).to.have.lengthOf(1);
         var issue = issues[0];
         expect(issue.type).to.eql('missing_tag');
+        expect(issue.subtype).to.eql('descriptive');
         expect(issue.entities).to.have.lengthOf(1);
         expect(issue.entities[0].id).to.eql('r-1');
     });
@@ -97,6 +100,7 @@ describe('iD.validations.missing_tag', function () {
         expect(issues).to.have.lengthOf(1);
         var issue = issues[0];
         expect(issue.type).to.eql('missing_tag');
+        expect(issue.subtype).to.eql('relation_type');
         expect(issue.entities).to.have.lengthOf(1);
         expect(issue.entities[0].id).to.eql('r-1');
     });
@@ -113,6 +117,7 @@ describe('iD.validations.missing_tag', function () {
         expect(issues).to.have.lengthOf(1);
         var issue = issues[0];
         expect(issue.type).to.eql('missing_tag');
+        expect(issue.subtype).to.eql('highway_classification');
         expect(issue.entities).to.have.lengthOf(1);
         expect(issue.entities[0].id).to.eql('w-1');
     });
diff --git a/test/spec/validations/outdated_tags.js b/test/spec/validations/outdated_tags.js
index 69414b050..ef387f683 100644
--- a/test/spec/validations/outdated_tags.js
+++ b/test/spec/validations/outdated_tags.js
@@ -61,6 +61,7 @@ describe('iD.validations.outdated_tags', function () {
         expect(issues).to.have.lengthOf(1);
         var issue = issues[0];
         expect(issue.type).to.eql('outdated_tags');
+        expect(issue.subtype).to.eql('deprecated_tags');
         expect(issue.severity).to.eql('warning');
         expect(issue.entities).to.have.lengthOf(1);
         expect(issue.entities[0].id).to.eql('w-1');
@@ -85,6 +86,7 @@ describe('iD.validations.outdated_tags', function () {
         expect(issues).to.not.have.lengthOf(0);
         var issue = issues[0];
         expect(issue.type).to.eql('outdated_tags');
+        expect(issue.subtype).to.eql('old_multipolygon');
         expect(issue.entities).to.have.lengthOf(2);
         expect(issue.entities[0].id).to.eql('w-1');
         expect(issue.entities[1].id).to.eql('r-1');