diff --git a/exchange/exchange.go b/exchange/exchange.go
index 992f756a5ba..04af7729273 100644
--- a/exchange/exchange.go
+++ b/exchange/exchange.go
@@ -764,49 +764,51 @@ func applyCategoryMapping(ctx context.Context, bidRequest *openrtb2.BidRequest,
 				categoryDuration = fmt.Sprintf("%s_%s", categoryDuration, bidderName.String())
 			}
 
-			if dupe, ok := dedupe[dupeKey]; ok {
+			if !brandCatExt.SkipDedup {
+				if dupe, ok := dedupe[dupeKey]; ok {
 
-				dupeBidPrice, err := strconv.ParseFloat(dupe.bidPrice, 64)
-				if err != nil {
-					dupeBidPrice = 0
-				}
-				currBidPrice, err := strconv.ParseFloat(pb, 64)
-				if err != nil {
-					currBidPrice = 0
-				}
-				if dupeBidPrice == currBidPrice {
-					if rand.Intn(100) < 50 {
-						dupeBidPrice = -1
-					} else {
-						currBidPrice = -1
+					dupeBidPrice, err := strconv.ParseFloat(dupe.bidPrice, 64)
+					if err != nil {
+						dupeBidPrice = 0
+					}
+					currBidPrice, err := strconv.ParseFloat(pb, 64)
+					if err != nil {
+						currBidPrice = 0
+					}
+					if dupeBidPrice == currBidPrice {
+						if rand.Intn(100) < 50 {
+							dupeBidPrice = -1
+						} else {
+							currBidPrice = -1
+						}
 					}
-				}
 
-				if dupeBidPrice < currBidPrice {
-					if dupe.bidderName == bidderName {
-						// An older bid from the current bidder
-						bidsToRemove = append(bidsToRemove, dupe.bidIndex)
-						rejections = updateRejections(rejections, dupe.bidID, "Bid was deduplicated")
-					} else {
-						// An older bid from a different seatBid we've already finished with
-						oldSeatBid := (seatBids)[dupe.bidderName]
-						if len(oldSeatBid.bids) == 1 {
-							seatBidsToRemove = append(seatBidsToRemove, dupe.bidderName)
+					if dupeBidPrice < currBidPrice {
+						if dupe.bidderName == bidderName {
+							// An older bid from the current bidder
+							bidsToRemove = append(bidsToRemove, dupe.bidIndex)
 							rejections = updateRejections(rejections, dupe.bidID, "Bid was deduplicated")
 						} else {
-							oldSeatBid.bids = append(oldSeatBid.bids[:dupe.bidIndex], oldSeatBid.bids[dupe.bidIndex+1:]...)
+							// An older bid from a different seatBid we've already finished with
+							oldSeatBid := (seatBids)[dupe.bidderName]
+							if len(oldSeatBid.bids) == 1 {
+								seatBidsToRemove = append(seatBidsToRemove, dupe.bidderName)
+								rejections = updateRejections(rejections, dupe.bidID, "Bid was deduplicated")
+							} else {
+								oldSeatBid.bids = append(oldSeatBid.bids[:dupe.bidIndex], oldSeatBid.bids[dupe.bidIndex+1:]...)
+							}
 						}
+						delete(res, dupe.bidID)
+					} else {
+						// Remove this bid
+						bidsToRemove = append(bidsToRemove, bidInd)
+						rejections = updateRejections(rejections, bidID, "Bid was deduplicated")
+						continue
 					}
-					delete(res, dupe.bidID)
-				} else {
-					// Remove this bid
-					bidsToRemove = append(bidsToRemove, bidInd)
-					rejections = updateRejections(rejections, bidID, "Bid was deduplicated")
-					continue
 				}
+				dedupe[dupeKey] = bidDedupe{bidderName: bidderName, bidIndex: bidInd, bidID: bidID, bidPrice: pb}
 			}
 			res[bidID] = categoryDuration
-			dedupe[dupeKey] = bidDedupe{bidderName: bidderName, bidIndex: bidInd, bidID: bidID, bidPrice: pb}
 		}
 
 		if len(bidsToRemove) > 0 {
diff --git a/exchange/exchange_test.go b/exchange/exchange_test.go
index 24fa2338e51..718fb98c8f1 100644
--- a/exchange/exchange_test.go
+++ b/exchange/exchange_test.go
@@ -3092,3 +3092,47 @@ type nilCategoryFetcher struct{}
 func (nilCategoryFetcher) FetchCategories(ctx context.Context, primaryAdServer, publisherId, iabCategory string) (string, error) {
 	return "", nil
 }
+
+func TestRecordAdaptorDuplicateBidIDs(t *testing.T) {
+	type bidderCollisions = map[string]int
+	testCases := []struct {
+		scenario         string
+		bidderCollisions *bidderCollisions // represents no of collisions detected for bid.id at bidder level for given request
+		hasCollision     bool
+	}{
+		{scenario: "invalid collision value", bidderCollisions: &map[string]int{"bidder-1": -1}, hasCollision: false},
+		{scenario: "no collision", bidderCollisions: &map[string]int{"bidder-1": 0}, hasCollision: false},
+		{scenario: "one collision", bidderCollisions: &map[string]int{"bidder-1": 1}, hasCollision: false},
+		{scenario: "multiple collisions", bidderCollisions: &map[string]int{"bidder-1": 2}, hasCollision: true}, // when 2 collisions it counter will be 1
+		{scenario: "multiple bidders", bidderCollisions: &map[string]int{"bidder-1": 2, "bidder-2": 4}, hasCollision: true},
+		{scenario: "multiple bidders with bidder-1 no collision", bidderCollisions: &map[string]int{"bidder-1": 1, "bidder-2": 4}, hasCollision: true},
+		{scenario: "no bidders", bidderCollisions: nil, hasCollision: false},
+	}
+	testEngine := metricsConf.NewMetricsEngine(&config.Configuration{}, nil)
+
+	for _, testcase := range testCases {
+		var adapterBids map[openrtb_ext.BidderName]*pbsOrtbSeatBid
+		if nil == testcase.bidderCollisions {
+			break
+		}
+		adapterBids = make(map[openrtb_ext.BidderName]*pbsOrtbSeatBid)
+		for bidder, collisions := range *testcase.bidderCollisions {
+			bids := make([]*pbsOrtbBid, 0)
+			testBidID := "bid_id_for_bidder_" + bidder
+			// add bids as per collisions value
+			bidCount := 0
+			for ; bidCount < collisions; bidCount++ {
+				bids = append(bids, &pbsOrtbBid{
+					bid: &openrtb2.Bid{
+						ID: testBidID,
+					},
+				})
+			}
+			if nil == adapterBids[openrtb_ext.BidderName(bidder)] {
+				adapterBids[openrtb_ext.BidderName(bidder)] = new(pbsOrtbSeatBid)
+			}
+			adapterBids[openrtb_ext.BidderName(bidder)].bids = bids
+		}
+		assert.Equal(t, testcase.hasCollision, recordAdaptorDuplicateBidIDs(testEngine, adapterBids))
+	}
+}