diff --git a/mllp_adapter/mllp_adapter.go b/mllp_adapter/mllp_adapter.go
index cc9df92..b6d0948 100644
--- a/mllp_adapter/mllp_adapter.go
+++ b/mllp_adapter/mllp_adapter.go
@@ -45,6 +45,7 @@ var (
 	hl7V2LocationID       = flag.String("hl7_v2_location_id", "", "ID of Cloud Location where the healthcare dataset is stored")
 	hl7V2DatasetID        = flag.String("hl7_v2_dataset_id", "", "ID of the healthcare dataset")
 	hl7V2StoreID          = flag.String("hl7_v2_store_id", "", "ID of the HL7v2 store inside the healthcare dataset")
+	logACK                = flag.Bool("log_ack", false, "[Optional] Whether to log the ACK received from the API. These info logs will contain sensitive data.")
 	logNACKedMsg          = flag.Bool("log_nacked_msg", false, "[Optional] Whether to log the contents of messages that receive NACK from the API. These error logs will contain sensitive data.")
 	logErrorMsg           = flag.Bool("log_error_msg", false, "[Optional] Whether to log the error message when NACK is received from the API. These error logs will contain sensitive data.")
 	exportStats           = flag.Bool("export_stats", true, "[Optional] Whether to export stackdriver stats")
@@ -79,7 +80,7 @@ func run() error {
 		log.Warningf("Flag --api_addr_prefix deprecated, API calls will be made to healthcare.googleapis.com/v1.")
 	}
 	si := healthapiclient.StoreInfo{*hl7V2ProjectID, *hl7V2LocationID, *hl7V2DatasetID, *hl7V2StoreID}
-	opt := healthapiclient.Option{*logNACKedMsg, *logErrorMsg}
+	opt := healthapiclient.Option{*logNACKedMsg, *logErrorMsg, *logACK}
 	apiClient, err := healthapiclient.NewHL7V2Client(ctx, *credentials, mon, si, opt)
 	if err != nil {
 		return fmt.Errorf("failed to connect to HL7v2 API: %v", err)
diff --git a/shared/healthapiclient/healthapiclient.go b/shared/healthapiclient/healthapiclient.go
index 52e888b..796ce68 100644
--- a/shared/healthapiclient/healthapiclient.go
+++ b/shared/healthapiclient/healthapiclient.go
@@ -54,6 +54,7 @@ type HL7V2Client struct {
 	hl7V2StoreID string
 	logNACKedMsg bool
 	logErrMsg    bool
+	logACK       bool
 }
 
 type sendMessageErrorResp struct {
@@ -77,6 +78,7 @@ type StoreInfo struct {
 type Option struct {
 	LogNACKedMessage bool
 	LogErrorMessage  bool
+	LogACK           bool
 }
 
 // NewHL7V2Client creates a properly authenticated client that talks to an HL7v2 backend.
@@ -99,6 +101,7 @@ func NewHL7V2Client(ctx context.Context, cred string, metrics monitoring.Client,
 		hl7V2StoreID: si.HL7V2StoreID,
 		logNACKedMsg: opt.LogNACKedMessage,
 		logErrMsg:    opt.LogErrorMessage,
+		logACK:       opt.LogACK,
 	}
 	c.initMetrics()
 	return c, nil
@@ -188,6 +191,9 @@ func (c *HL7V2Client) Send(data []byte) ([]byte, error) {
 		c.metrics.IncCounter(sendErrorMetric)
 		return nil, fmt.Errorf("unable to parse ACK response: %v", err)
 	}
+	if c.logACK {
+		log.Infof("Received ACK from HL7V2 Store: %s", sanitizeMessageForPrintout(ack))
+	}
 	log.Infof("Message was successfully sent to the Cloud Healthcare API HL7V2 Store.")
 	return ack, nil
 }