diff --git a/service/src/main/java/org/cbioportal/genome_nexus/service/cached/CachedVariantAnnotationFetcher.java b/service/src/main/java/org/cbioportal/genome_nexus/service/cached/CachedVariantAnnotationFetcher.java
index 6fdaea0b..77726296 100644
--- a/service/src/main/java/org/cbioportal/genome_nexus/service/cached/CachedVariantAnnotationFetcher.java
+++ b/service/src/main/java/org/cbioportal/genome_nexus/service/cached/CachedVariantAnnotationFetcher.java
@@ -34,7 +34,7 @@ public CachedVariantAnnotationFetcher(ExternalResourceTransformer<VariantAnnotat
 
     @Override
     protected Boolean isValidId(String id) {
-        return !id.contains("N") && !id.contains("-") && !id.contains("undefined") && !id.contains("g.0") && id.contains(":") && id.split(":")[1].matches(".*\\d+.*");
+        return !id.contains("-") && !id.contains("undefined") && !id.contains("g.0") && id.contains(":") && id.split(":")[1].matches(".*\\d+.*");
     }
 
     @Override
diff --git a/service/src/main/java/org/cbioportal/genome_nexus/service/cached/CachedVariantRegionAnnotationFetcher.java b/service/src/main/java/org/cbioportal/genome_nexus/service/cached/CachedVariantRegionAnnotationFetcher.java
index 686f0615..94ecb24f 100644
--- a/service/src/main/java/org/cbioportal/genome_nexus/service/cached/CachedVariantRegionAnnotationFetcher.java
+++ b/service/src/main/java/org/cbioportal/genome_nexus/service/cached/CachedVariantRegionAnnotationFetcher.java
@@ -39,7 +39,7 @@ protected Boolean isValidId(String id)
         // 17:36002278-36002277:1/A
         //  1:206811015-206811016:1/-
         return (
-            !id.contains("N") && !id.contains("undefined") && !id.contains("g.") &&
+            !id.contains("undefined") && !id.contains("g.") &&
             id.contains("-") &&
             // should have two :
             (id.length() - id.replace(":","").length() == 2) &&