diff --git a/Src/java/engine/src/main/java/org/opencds/cqf/cql/engine/execution/Environment.java b/Src/java/engine/src/main/java/org/opencds/cqf/cql/engine/execution/Environment.java
index aea4c8d89..0f0db054b 100644
--- a/Src/java/engine/src/main/java/org/opencds/cqf/cql/engine/execution/Environment.java
+++ b/Src/java/engine/src/main/java/org/opencds/cqf/cql/engine/execution/Environment.java
@@ -116,6 +116,10 @@ public Object as(Object operand, Class<?> type, boolean isStrict) {
             return null;
         }
 
+        if (Iterable.class.isAssignableFrom(type) && operand instanceof Iterable) {
+            return operand;
+        }
+
         if (type.isAssignableFrom(operand.getClass())) {
             return operand;
         }
@@ -176,6 +180,10 @@ public Boolean is(Object operand, Class<?> type) {
             return null;
         }
 
+        if (Iterable.class.isAssignableFrom(type) && operand instanceof Iterable) {
+            return true;
+        }
+
         if (type.isAssignableFrom(operand.getClass())) {
             return true;
         }