diff --git a/.gitignore b/.gitignore
index f4fbcc9..45aa949 100644
--- a/.gitignore
+++ b/.gitignore
@@ -549,3 +549,6 @@ dmypy.json
 
 # End of https://www.toptal.com/developers/gitignore/api/visualstudiocode
 **/__pycache__/**
+
+# MacOS generated files
+.DS_STORE
diff --git a/src/dcm_classifier/utility_functions.py b/src/dcm_classifier/utility_functions.py
index 81d5cbc..ec6c058 100644
--- a/src/dcm_classifier/utility_functions.py
+++ b/src/dcm_classifier/utility_functions.py
@@ -766,7 +766,15 @@ def get_coded_dictionary_elements(
                 else:
                     dataset_dictionary[feature] = 0
         elif name == "ContrastBolusAgent":
-            no_contrast_list = ["none", "no", "no contrast", "no_contrast", "n", ""]
+            no_contrast_list = [
+                "none",
+                "no",
+                "no contrast",
+                "no_contrast",
+                "n",
+                "",
+                "-12345",
+            ]
             if str(value).lower() in no_contrast_list:
                 dataset_dictionary["ContrastBolusAgent"] = "None"
             else:
diff --git a/tests/testing_data/anonymized_testing_data/contrast_data/without_contrast/no_contrastbolusagent_tag.dcm b/tests/testing_data/anonymized_testing_data/contrast_data/without_contrast/no_contrastbolusagent_tag.dcm
new file mode 100644
index 0000000..0f4c7fa
--- /dev/null
+++ b/tests/testing_data/anonymized_testing_data/contrast_data/without_contrast/no_contrastbolusagent_tag.dcm
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:5d710631c61e7953e600b37d02ba3009ebe5b28f51b866cb7c29cca8e23a1468
+size 132604
diff --git a/tests/testing_data/integration_testing/classify_study_data/output.json b/tests/testing_data/integration_testing/classify_study_data/output.json
index b180d2d..e42308d 100644
--- a/tests/testing_data/integration_testing/classify_study_data/output.json
+++ b/tests/testing_data/integration_testing/classify_study_data/output.json
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:c0e3d723c3bd7976e68491d0674bdefffde8a378bb0cf49fbea01bf63bb22e89
-size 33747
+oid sha256:eac37171712b3b71e90a9f200e24f84f735ea9d50b48691a897d14b030c32e38
+size 32941
diff --git a/tests/unit_testing/test_dicom_series.py b/tests/unit_testing/test_dicom_series.py
index 6d5b179..129f417 100644
--- a/tests/unit_testing/test_dicom_series.py
+++ b/tests/unit_testing/test_dicom_series.py
@@ -205,7 +205,9 @@ def test_dcm_series_no_contrast(no_contrast_file_path):
     study.run_inference()
 
     for series_number, series in study.series_dictionary.items():
-        assert series.get_has_contrast() is False
+        assert (
+            series.get_has_contrast() is False
+        ), f"File {series.get_volume_list()[0].get_one_volume_dcm_filenames()[0].name} came back with contrast"
 
 
 def test_dcm_series_has_contrast(contrast_file_path):