diff --git a/api/src/main/java/org/openmrs/module/kenyaemr/calculation/library/hiv/art/ViralLoadCategoriesCalculation.java b/api/src/main/java/org/openmrs/module/kenyaemr/calculation/library/hiv/art/ViralLoadCategoriesCalculation.java
new file mode 100644
index 0000000000..8c0bc627d8
--- /dev/null
+++ b/api/src/main/java/org/openmrs/module/kenyaemr/calculation/library/hiv/art/ViralLoadCategoriesCalculation.java
@@ -0,0 +1,102 @@
+/**
+ * This Source Code Form is subject to the terms of the Mozilla Public License,
+ * v. 2.0. If a copy of the MPL was not distributed with this file, You can
+ * obtain one at http://mozilla.org/MPL/2.0/. OpenMRS is also distributed under
+ * the terms of the Healthcare Disclaimer located at http://openmrs.org/license.
+ *
+ * Copyright (C) OpenMRS Inc. OpenMRS is a registered trademark and the OpenMRS
+ * graphic logo is a trademark of OpenMRS Inc.
+ */
+package org.openmrs.module.kenyaemr.calculation.library.hiv.art;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.openmrs.Program;
+import org.openmrs.calculation.patient.PatientCalculationContext;
+import org.openmrs.calculation.result.CalculationResult;
+import org.openmrs.calculation.result.CalculationResultMap;
+import org.openmrs.module.kenyacore.calculation.*;
+import org.openmrs.module.kenyaemr.calculation.library.hiv.LostToFollowUpCalculation;
+import org.openmrs.module.kenyaemr.metadata.HivMetadata;
+import org.openmrs.module.metadatadeploy.MetadataUtils;
+import org.openmrs.ui.framework.SimpleObject;
+
+import java.util.Collection;
+import java.util.Date;
+import java.util.Map;
+import java.util.Set;
+
+import static org.openmrs.module.kenyaemr.calculation.EmrCalculationUtils.daysSince;
+public class ViralLoadCategoriesCalculation extends AbstractPatientCalculation implements PatientFlagCalculation {
+        private String vlMessage;
+        /*
+        KHP3-525: Get the Last VL load- Categorize them into Unsuppressed (>1000), high viremia (400-999), low viremia (0-399)
+        * If VL level is above 1000 in the last 12 months, the patient is unsuppressed
+        *
+        * If VL level is between 400 and 999 in the last 12 months, the patient has high viremia
+        *
+        * If VL level is between 0 and 399 in the last 12 months, the patient has low viremia
+        * */
+        @Override
+        public CalculationResultMap evaluate(Collection<Integer> cohort, Map<String, Object> parameterValues, PatientCalculationContext context) {
+                Program hivProgram = MetadataUtils.existing(Program.class, HivMetadata._Program.HIV);
+                Set<Integer> alive = Filters.alive(cohort, context);
+                Set<Integer> inHivProgram = Filters.inProgram(hivProgram, alive, context);
+                Set<Integer> allOnArt = CalculationUtils.patientsThatPass(calculate(new OnArtCalculation(), cohort, context));
+
+                //Checks for ltfu
+                Set<Integer> ltfu = CalculationUtils.patientsThatPass(calculate(new LostToFollowUpCalculation(), cohort, context));
+                // All on ART already
+                LastViralLoadResultCalculation lastVlResultCalculation = new LastViralLoadResultCalculation();
+                CalculationResultMap lastVlResults = lastVlResultCalculation.evaluate(cohort, null, context);
+                CalculationResultMap ret = new CalculationResultMap();
+                for(Integer ptId:cohort) {
+                        boolean eligibleForFlag = false;
+                       if(!ltfu.contains(ptId) && inHivProgram.contains(ptId)){
+                                String lastVlResult = null;
+                                Double lastVlResultValue = null;
+                                Date lastVLResultDate = null;
+                                CalculationResult lastvlresult = lastVlResults.get(ptId);
+                                if (lastvlresult != null && lastvlresult.getValue() != null) {
+                                        Object lastVl = lastvlresult.getValue();
+                                        SimpleObject res = (SimpleObject) lastVl;
+                                        lastVlResult = res.get("lastVl").toString();
+                                        lastVLResultDate = (Date) res.get("lastVlDate");
+                                        if (daysSince(lastVLResultDate, context) <= 365) {
+                                                if(lastVlResult =="LDL"){
+                                                        vlMessage = "Low Viremia";
+                                                } else {
+                                                        lastVlResultValue = Double.parseDouble(lastVlResult);
+                                                        categorizeViralLoad(lastVlResultValue);
+                                                }
+                                                eligibleForFlag = true;
+                                        }
+
+                               }
+                        }
+                        ret.put(ptId, new BooleanResult(eligibleForFlag, this));
+
+                }
+                return ret;
+        }
+
+        private void categorizeViralLoad(Double lastVlResultValue) {
+                //If VL level is above 1000 in the last 12 months, the patient is unsuppressed
+                if ((lastVlResultValue >= 1000)) {
+                        vlMessage = "Unsuppressed";
+                }
+                //If VL level is between 400 and 999 in the last 12 months, the patient has high viremia
+                if (lastVlResultValue >= 400 && lastVlResultValue <= 999) {
+                        vlMessage = "High Viremia";
+                }
+                //If VL level is between 0 and 399 in the last 12 months, the patient has low viremia
+                if (lastVlResultValue == 0 && lastVlResultValue <= 399) {
+                        vlMessage = "Low Virema";
+                }
+        }
+
+        @Override
+        public String getFlagMessage() {
+                return vlMessage;
+        }
+}
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