diff --git a/org.hl7.fhir.r4/src/main/java/org/hl7/fhir/r4/context/BaseWorkerContext.java b/org.hl7.fhir.r4/src/main/java/org/hl7/fhir/r4/context/BaseWorkerContext.java
index b8e671395..6cc306e03 100644
--- a/org.hl7.fhir.r4/src/main/java/org/hl7/fhir/r4/context/BaseWorkerContext.java
+++ b/org.hl7.fhir.r4/src/main/java/org/hl7/fhir/r4/context/BaseWorkerContext.java
@@ -523,7 +523,7 @@ public abstract class BaseWorkerContext extends I18nBase implements IWorkerConte
     return doValidateCode(options, code, vs, false);
   }
 
-  public ValidationResult doValidateCode(ValidationOptions options, Coding code, ValueSet vs, boolean implySystem) {
+  public ValidationResult doValidateCode(ValidationOptions options, Coding code, ValueSet vs, boolean inferSystem) {
     CacheToken cacheToken = txCache != null ? txCache.generateValidationToken(options, code, vs) : null;
     ValidationResult res = null;
     if (txCache != null)
@@ -553,8 +553,8 @@ public abstract class BaseWorkerContext extends I18nBase implements IWorkerConte
     try {
       Parameters pIn = new Parameters();
       pIn.addParameter().setName("coding").setValue(code);
-      if (implySystem)
-        pIn.addParameter().setName("implySystem").setValue(new BooleanType(true));
+      if (inferSystem)
+        pIn.addParameter().setName("inferSystem").setValue(new BooleanType(true));
       if (options != null)
         setTerminologyOptions(options, pIn);
       res = validateOnServer(vs, pIn);
diff --git a/org.hl7.fhir.r4b/src/main/java/org/hl7/fhir/r4b/context/BaseWorkerContext.java b/org.hl7.fhir.r4b/src/main/java/org/hl7/fhir/r4b/context/BaseWorkerContext.java
index 5adc72f2c..a0ade7a31 100644
--- a/org.hl7.fhir.r4b/src/main/java/org/hl7/fhir/r4b/context/BaseWorkerContext.java
+++ b/org.hl7.fhir.r4b/src/main/java/org/hl7/fhir/r4b/context/BaseWorkerContext.java
@@ -914,7 +914,7 @@ public abstract class BaseWorkerContext extends I18nBase implements IWorkerConte
         Parameters pIn = new Parameters();
         pIn.addParameter().setName("coding").setValue(t.getCoding());
         if (options.isGuessSystem()) {
-          pIn.addParameter().setName("implySystem").setValue(new BooleanType(true));
+          pIn.addParameter().setName("inferSystem").setValue(new BooleanType(true));
         }
         if (vs != null) {
           pIn.addParameter().setName("valueSet").setResource(vs);
@@ -1030,7 +1030,7 @@ public abstract class BaseWorkerContext extends I18nBase implements IWorkerConte
       Parameters pIn = new Parameters();
       pIn.addParameter().setName("coding").setValue(code);
       if (options.isGuessSystem()) {
-        pIn.addParameter().setName("implySystem").setValue(new BooleanType(true));
+        pIn.addParameter().setName("inferSystem").setValue(new BooleanType(true));
       }
       setTerminologyOptions(options, pIn);
       res = validateOnServer(vs, pIn, options);
diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/BaseWorkerContext.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/BaseWorkerContext.java
index 401a126b5..efcc3ff5b 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/BaseWorkerContext.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/context/BaseWorkerContext.java
@@ -1271,7 +1271,7 @@ public abstract class BaseWorkerContext extends I18nBase implements IWorkerConte
     Parameters pIn = new Parameters();
     pIn.addParameter().setName("coding").setValue(coding);
     if (options.isGuessSystem()) {
-      pIn.addParameter().setName("implySystem").setValue(new BooleanType(true));
+      pIn.addParameter().setName("inferSystem").setValue(new BooleanType(true));
     }
     setTerminologyOptions(options, pIn);
     return pIn;
@@ -1288,7 +1288,7 @@ public abstract class BaseWorkerContext extends I18nBase implements IWorkerConte
     Parameters pIn = new Parameters();
     pIn.addParameter().setName("coding").setValue(codingValidationRequest.getCoding());
     if (options.isGuessSystem()) {
-      pIn.addParameter().setName("implySystem").setValue(new BooleanType(true));
+      pIn.addParameter().setName("inferSystem").setValue(new BooleanType(true));
     }
     if (valueSet != null) {
       pIn.addParameter().setName("valueSet").setResource(valueSet);
@@ -1301,7 +1301,7 @@ public abstract class BaseWorkerContext extends I18nBase implements IWorkerConte
     Parameters pIn = new Parameters();
     pIn.addParameter().setName("coding").setValue(codingValidationRequest.getCoding());
     if (options.isGuessSystem()) {
-      pIn.addParameter().setName("implySystem").setValue(new BooleanType(true));
+      pIn.addParameter().setName("inferSystem").setValue(new BooleanType(true));
     }
     if (vsUrl != null) {
       pIn.addParameter().setName("url").setValue(new CanonicalType(vsUrl));