diff --git a/pixl_core/src/core/patient_queue/message.py b/pixl_core/src/core/patient_queue/message.py
index 3f19b0f4d..c98a5decc 100644
--- a/pixl_core/src/core/patient_queue/message.py
+++ b/pixl_core/src/core/patient_queue/message.py
@@ -31,7 +31,7 @@ class Message:
     mrn: str
     accession_number: str
     study_date: date
-    procedure_occurrence_id: str
+    procedure_occurrence_id: int
     project_name: str
     omop_es_timestamp: datetime