diff --git a/cumulus_library/studies/discovery/code_definitions.py b/cumulus_library/studies/discovery/code_definitions.py
index 68905be1..9657285c 100644
--- a/cumulus_library/studies/discovery/code_definitions.py
+++ b/cumulus_library/studies/discovery/code_definitions.py
@@ -58,6 +58,11 @@
         "table_name": "medication",
         "column_hierarchy": [("medicationcode", dict), ("coding", list)],
     },
+    # MedicationRequest
+    {
+        "table_name": "medicationrequest",
+        "column_hierarchy": [("medicationcodeableconcept", dict), ("coding", list)],
+    },
     # Observation
     {
         "table_name": "observation",