diff --git a/adata/common/utils/code_utils.py b/adata/common/utils/code_utils.py
index e1f5bf2..547acca 100644
--- a/adata/common/utils/code_utils.py
+++ b/adata/common/utils/code_utils.py
@@ -12,6 +12,7 @@
     '43': '.BJ',
     '60': '.SH',
     '68': '.SH',
+    '81': '.BJ',
     '83': '.BJ',
     '87': '.BJ',
     '90': '.SH',