diff --git a/src/nancodes.py b/src/nancodes.py
new file mode 100644
index 0000000..37085a9
--- /dev/null
+++ b/src/nancodes.py
@@ -0,0 +1,19 @@
+"""Provides unified not-a-number codes for the indicators.
+
+Currently requires a manual sync between the covidcast-indicators
+and the utils repos.
+* in cmu-delphi/covidcast-indicators: _delphi_utils_python/delphi_utils/
+* in cmu-delphi/utils: src/
+"""
+
+from enum import IntEnum
+
+class Nans(IntEnum):
+    """An enum of not-a-number codes for the indicators."""
+
+    NOT_MISSING = 0
+    NOT_APPLICABLE = 1
+    REGION_EXCEPTION = 2
+    DATA_INSUFFICIENT = 3
+    PRIVACY = 4
+    UNKNOWN = 5