diff --git a/src/entity/emr/emr_patient.ts b/src/entity/emr/emr_patient.ts
index cda1ed4..9325ffd 100644
--- a/src/entity/emr/emr_patient.ts
+++ b/src/entity/emr/emr_patient.ts
@@ -31,7 +31,7 @@ export class EmrPatient {
 	@Column({ nullable: true, length: 256 })
 	full_name: string;
 
-	@Column({ nullable: true, length: 256 })
+	@Column({ nullable: true, length: 256, unique: true })
 	card_number: string;
 
 	@Column({ type: "date", nullable: false })