diff --git a/src/main/java/org/cbioportal/persistence/StudyViewRepository.java b/src/main/java/org/cbioportal/persistence/StudyViewRepository.java
index 3b60e17fcd4..478b263ade3 100644
--- a/src/main/java/org/cbioportal/persistence/StudyViewRepository.java
+++ b/src/main/java/org/cbioportal/persistence/StudyViewRepository.java
@@ -47,6 +47,8 @@ public interface StudyViewRepository {
     
     int getFilteredSamplesCount(StudyViewFilterContext studyViewFilterContext);
     
+    int getFilteredPatientCount(StudyViewFilterContext studyViewFilterContext);
+    
     Map<String, Set<String>> getMatchingGenePanelIds(StudyViewFilterContext studyViewFilterContext, String alterationType);
     
     int getTotalProfiledCountsByAlterationType(StudyViewFilterContext studyViewFilterContext, String alterationType);
diff --git a/src/main/java/org/cbioportal/persistence/mybatisclickhouse/StudyViewMapper.java b/src/main/java/org/cbioportal/persistence/mybatisclickhouse/StudyViewMapper.java
index 5bc659e5c5a..2135ccea95d 100644
--- a/src/main/java/org/cbioportal/persistence/mybatisclickhouse/StudyViewMapper.java
+++ b/src/main/java/org/cbioportal/persistence/mybatisclickhouse/StudyViewMapper.java
@@ -48,6 +48,8 @@ public interface StudyViewMapper {
     
     int getFilteredSamplesCount(@Param("studyViewFilterHelper") StudyViewFilterHelper studyViewFilterHelper);
     
+    int getFilteredPatientsCount(@Param("studyViewFilterHelper") StudyViewFilterHelper studyViewFilterHelper);
+    
     List<GenePanelToGene> getMatchingGenePanelIds(StudyViewFilterHelper studyViewFilterHelper, String alterationType);
     
     int getTotalProfiledCountByAlterationType(StudyViewFilterHelper studyViewFilterHelper, String alterationType);
diff --git a/src/main/java/org/cbioportal/persistence/mybatisclickhouse/StudyViewMyBatisRepository.java b/src/main/java/org/cbioportal/persistence/mybatisclickhouse/StudyViewMyBatisRepository.java
index 41687281c5d..a0a3a572e60 100644
--- a/src/main/java/org/cbioportal/persistence/mybatisclickhouse/StudyViewMyBatisRepository.java
+++ b/src/main/java/org/cbioportal/persistence/mybatisclickhouse/StudyViewMyBatisRepository.java
@@ -163,6 +163,11 @@ public int getFilteredSamplesCount(StudyViewFilterContext studyViewFilterContext
         return mapper.getFilteredSamplesCount(createStudyViewFilterHelper(studyViewFilterContext));
     }
 
+    @Override
+    public int getFilteredPatientCount(StudyViewFilterContext studyViewFilterContext) {
+        return mapper.getFilteredPatientsCount(createStudyViewFilterHelper(studyViewFilterContext));
+    }
+
     @Override
     public Map<String, Set<String>> getMatchingGenePanelIds(StudyViewFilterContext studyViewFilterContext, String alterationType) {
         return mapper.getMatchingGenePanelIds(createStudyViewFilterHelper(studyViewFilterContext), alterationType)
diff --git a/src/main/java/org/cbioportal/service/impl/StudyViewColumnarServiceImpl.java b/src/main/java/org/cbioportal/service/impl/StudyViewColumnarServiceImpl.java
index b1ada8fac31..6ab20d58e29 100644
--- a/src/main/java/org/cbioportal/service/impl/StudyViewColumnarServiceImpl.java
+++ b/src/main/java/org/cbioportal/service/impl/StudyViewColumnarServiceImpl.java
@@ -107,7 +107,17 @@ public Map<String, ClinicalDataType> getClinicalAttributeDatatypeMap() {
     
     @Override
     public List<ClinicalDataCountItem> getClinicalDataCounts(StudyViewFilter studyViewFilter, List<String> filteredAttributes) {
-        return generateDataCountItemsFromDataCounts(studyViewRepository.getClinicalDataCounts(createContext(studyViewFilter), filteredAttributes));
+        StudyViewFilterContext studyViewFilterContext = createContext(studyViewFilter);
+        List<ClinicalDataCount> dataCounts = studyViewRepository.getClinicalDataCounts(studyViewFilterContext, filteredAttributes);
+        List<ClinicalDataCountItem> clinicalDataCountItems = generateDataCountItemsFromDataCounts(dataCounts);
+        
+        return calculateMissingNaCountsForClinicalDataCountItems(
+            clinicalDataCountItems,
+            filteredAttributes,
+            this.getClinicalAttributeDatatypeMap(),
+            studyViewRepository.getFilteredSamplesCount(studyViewFilterContext),
+            studyViewRepository.getFilteredPatientCount(studyViewFilterContext)
+        );
     }
 
     @Override
@@ -170,6 +180,76 @@ private List<ClinicalDataCountItem> generateDataCountItemsFromDataCounts(List<Cl
             }).toList();
     }
 
+    public static List<ClinicalDataCountItem> calculateMissingNaCountsForClinicalDataCountItems(
+        List<ClinicalDataCountItem> clinicalDataCountItems,
+        List<String> filteredAttributes,
+        Map<String, ClinicalDataType> clinicalAttributeDatatypeMap,
+        int filteredSamplesCount,
+        int filteredPatientsCount
+    ) {
+        // Postprocess clinical data count items to adjust NA counts
+        List<ClinicalDataCountItem> combinedClinicalDataCountItems = new ArrayList<>();
+
+        Map<String, ClinicalDataCountItem> clinicalDataCountItemMap = clinicalDataCountItems
+            .stream()
+            .collect(Collectors.toMap(
+                ClinicalDataCountItem::getAttributeId,
+                item -> item
+            ));
+
+        // go over all filtered attributes, not just attributes found in clinicalDataCountItems
+        for (String attributeId: filteredAttributes) {
+            ClinicalDataCountItem clinicalDataCountItem = clinicalDataCountItemMap.get(attributeId);
+            boolean isItemMissing = false;
+
+            if (clinicalDataCountItem == null) {
+                isItemMissing = true;
+                clinicalDataCountItem = new ClinicalDataCountItem();
+                clinicalDataCountItem.setAttributeId(attributeId);
+                clinicalDataCountItem.setCounts(new ArrayList<>());
+            }
+
+            Integer totalClinicalDataCount = clinicalDataCountItem
+                .getCounts()
+                .stream()
+                .map(ClinicalDataCount::getCount)
+                .reduce(0, Integer::sum);
+            // depending on clinical data type we either use filtered sample count or filtered patient count
+            int filteredCount = clinicalAttributeDatatypeMap.get(clinicalDataCountItem.getAttributeId()) == ClinicalDataType.SAMPLE ?
+                filteredSamplesCount: filteredPatientsCount;
+            int casesWithoutClinicalData = filteredCount - totalClinicalDataCount;
+
+            if (casesWithoutClinicalData > 0) {
+                // some of these attributes may be completely missing in clinicalDataCountItem
+                // in case the only attribute value is NA.
+                // we need to manually add those missing items to make sure we have NA counts.
+                if (isItemMissing) {
+                    combinedClinicalDataCountItems.add(clinicalDataCountItem);
+                }
+
+                // find "NA" or else create a new one
+                ClinicalDataCount naClinicalDataCount = clinicalDataCountItem
+                    .getCounts()
+                    .stream()
+                    .filter(c -> c.getValue().equals("NA"))
+                    .findFirst()
+                    .orElseGet(() -> {
+                        // this should only happen when there are multiple studies
+                        ClinicalDataCount count = new ClinicalDataCount();
+                        count.setAttributeId(attributeId);
+                        count.setValue("NA");
+                        count.setCount(0);
+                        return count;
+                    });
+
+                naClinicalDataCount.setCount(naClinicalDataCount.getCount() + casesWithoutClinicalData);
+            }
+        }
+
+        combinedClinicalDataCountItems.addAll(clinicalDataCountItems);
+        return combinedClinicalDataCountItems;
+    }
+
     public static List<CaseListDataCount> mergeCaseListCounts(List<CaseListDataCount> counts) {
         Map<String, List<CaseListDataCount>> countsPerListType = counts.stream()
             .collect((Collectors.groupingBy(CaseListDataCount::getValue)));
diff --git a/src/main/resources/org/cbioportal/persistence/mybatisclickhouse/StudyViewMapper.xml b/src/main/resources/org/cbioportal/persistence/mybatisclickhouse/StudyViewMapper.xml
index ddd65175da7..4fad2f3b14c 100644
--- a/src/main/resources/org/cbioportal/persistence/mybatisclickhouse/StudyViewMapper.xml
+++ b/src/main/resources/org/cbioportal/persistence/mybatisclickhouse/StudyViewMapper.xml
@@ -226,7 +226,13 @@
         FROM sample_derived
         WHERE sample_unique_id IN (<include refid="sampleUniqueIdsFromStudyViewFilter"/>)
     </sql>
-
+    
+    <sql id="getTotalPatientCount">
+        SELECT count(distinct patient_unique_id) as count
+        FROM sample_derived sd
+        WHERE sample_unique_id IN (<include refid="sampleUniqueIdsFromStudyViewFilter"/>)
+    </sql>
+    
     <!-- for /genomic-data-counts/fetch - (returns GenomicDataCountItem objects) -->
     <select id="getCNACounts" resultMap="GenomicDataCountItemResultMap">
         <bind name="profileType" value="genomicDataFilters[0].profileType" />
@@ -396,7 +402,11 @@
     <select id="getFilteredSamplesCount" resultType="int">
         <include refid="getTotalSampleCount"/>
     </select>
-
+    
+    <select id="getFilteredPatientsCount" resultType="int">
+        <include refid="getTotalPatientCount"/>
+    </select>
+    
     <!-- Get Matching Gene Panel Ids for all Samples after study view filter -->
     <select id="getMatchingGenePanelIds" resultType="org.cbioportal.model.GenePanelToGene">
         SELECT
diff --git a/test/api-e2e/specs/clinical-data-filters.json b/test/api-e2e/specs/clinical-data-filters.json
index e6f3377745c..08d38fecb95 100644
--- a/test/api-e2e/specs/clinical-data-filters.json
+++ b/test/api-e2e/specs/clinical-data-filters.json
@@ -3178,7 +3178,6 @@
       {
         "hash": -308561323,
         "filterString": "Diagnosis Age: < x ≤ 4570Mutation Count: < x ≤ 2080Ethnicity Category:Hispanic Or Latino",
-        "skip": "Should be fixed by NA backend fix",
         "data": {
           "attributes": [
             {