diff --git a/src/fhir/guidanceResponseUtilities.ts b/src/fhir/guidanceResponseUtilities.ts
index 1743ead3..b6806e18 100644
--- a/src/fhir/guidanceResponseUtilities.ts
+++ b/src/fhir/guidanceResponseUtilities.ts
@@ -28,6 +28,7 @@ export class GuidanceResponseUtilities {
     etasu: Pick<
       RemsCase,
       | 'drugName'
+      | 'auth_number'
       | 'status'
       | 'drugCode'
       | 'patientFirstName'
@@ -77,7 +78,7 @@ export class GuidanceResponseUtilities {
         outputParameters.parameter?.push(parameter);
       }
     });
-
+    outputParameters.parameter?.push({ name: 'auth_number', valueString: etasu?.auth_number });
     return outputParameters;
   }
 
@@ -85,6 +86,7 @@ export class GuidanceResponseUtilities {
     etasu: Pick<
       RemsCase,
       | 'drugName'
+      | 'auth_number'
       | 'status'
       | 'drugCode'
       | 'patientFirstName'
diff --git a/src/fhir/models.ts b/src/fhir/models.ts
index b1015386..566f5e26 100644
--- a/src/fhir/models.ts
+++ b/src/fhir/models.ts
@@ -32,6 +32,7 @@ export interface MetRequirements extends Document {
 
 export interface RemsCase extends Document {
   case_number: string;
+  auth_number: string;
   status: string;
   drugName: string;
   drugCode: string;
@@ -88,6 +89,7 @@ export const metRequirementsCollection = model<MetRequirements>(
 
 const remsCaseCollectionSchema = new Schema<RemsCase>({
   case_number: { type: String },
+  auth_number: { type: String },
   status: { type: String },
   drugName: { type: String },
   patientFirstName: { type: String },
diff --git a/src/lib/etasu.ts b/src/lib/etasu.ts
index f4558116..a397c2a7 100644
--- a/src/lib/etasu.ts
+++ b/src/lib/etasu.ts
@@ -33,6 +33,11 @@ router.get('/met/:caseId', async (req: Request, res: Response) => {
   res.send(await remsCaseCollection.findOne({ case_number: req.params.caseId }));
 });
 
+router.get('/met/auth/:authNumber', async (req: Request, res: Response) => {
+  console.log('get etasu by authnumber: ' + req.params.authNumber);
+  res.send(await remsCaseCollection.findOne({ auth_number: req.params.authNumber }));
+});
+
 export const getCaseInfo = async (
   remsCaseSearchDict: FilterQuery<RemsCase>,
   medicationSearchDict: FilterQuery<Medication>
@@ -40,6 +45,7 @@ export const getCaseInfo = async (
   RemsCase,
   | 'status'
   | 'drugName'
+  | 'auth_number'
   | 'drugCode'
   | 'patientFirstName'
   | 'patientLastName'
@@ -60,6 +66,7 @@ export const getCaseInfo = async (
         RemsCase,
         | 'status'
         | 'drugName'
+        | 'auth_number'
         | 'drugCode'
         | 'patientFirstName'
         | 'patientLastName'
@@ -68,6 +75,7 @@ export const getCaseInfo = async (
       > = {
         status: 'Approved',
         drugName: drug?.name,
+        auth_number: remsCaseSearchDict.auth_number || '',
         drugCode: drug?.code,
         patientFirstName: remsCaseSearchDict.patientFirstName || '',
         patientLastName: remsCaseSearchDict.patientLastName || '',
@@ -221,6 +229,7 @@ const createMetRequirementAndNewCase = async (
   const remsRequest: Pick<
     RemsCase,
     | 'case_number'
+    | 'auth_number'
     | 'status'
     | 'drugName'
     | 'drugCode'
@@ -230,6 +239,7 @@ const createMetRequirementAndNewCase = async (
     | 'metRequirements'
   > = {
     case_number: case_number,
+    auth_number: '',
     status: remsRequestCompletedStatus,
     drugName: drug?.name,
     drugCode: drug?.code,
@@ -377,6 +387,7 @@ const createMetRequirementAndUpdateCase = async (
 
         if (!foundUncompleted && remsRequestToUpdate?.status === 'Pending') {
           remsRequestToUpdate.status = 'Approved';
+          remsRequestToUpdate.auth_number = uid();
           await remsRequestToUpdate.save();
         }
       }