diff --git a/src/genomehubs/lib/hub.py b/src/genomehubs/lib/hub.py
index 6da6d4d4..e3f1315a 100644
--- a/src/genomehubs/lib/hub.py
+++ b/src/genomehubs/lib/hub.py
@@ -503,3 +503,31 @@ def set_column_indices(types, header):
                     index = headers.get(value["header"], None)
                     if index is not None:
                         value.update({"index": index})
+
+
+def write_imported_rows(rows, opts, *, types, header=None, label="imported"):
+    """Write imported rows to processed file."""
+    file_key = "%s-exception" % opts["index"]
+    dir_key = "%s-dir" % opts["index"]
+    if file_key in opts and opts[file_key]:
+        outdir = opts[file_key]
+    else:
+        outdir = "%s/%s" % (opts[dir_key], label)
+    os.makedirs(outdir, exist_ok=True)
+    outfile = "%s/%s" % (outdir, types["file"]["name"])
+    data = []
+    header_len = 0
+    if header is not None:
+        data.append(header)
+        header_len = 1
+    if isinstance(rows, dict):
+        for row_set in rows.values():
+            for row in row_set:
+                data.append(row)
+    else:
+        for row in rows:
+            data.append(row)
+    LOGGER.info(
+        "Writing %d records to %s file '%s", len(data) - header_len, label, outfile
+    )
+    tofile.write_file(outfile, data)
diff --git a/src/genomehubs/lib/index.py b/src/genomehubs/lib/index.py
index 5a1c0445..344c5e0b 100644
--- a/src/genomehubs/lib/index.py
+++ b/src/genomehubs/lib/index.py
@@ -71,6 +71,7 @@
 from .hub import process_row
 from .hub import set_column_indices
 from .hub import validate_types_file
+from .hub import write_imported_rows
 from .taxon import add_names_and_attributes_to_taxa
 from .taxon import fix_missing_ids
 from .version import __version__
@@ -84,14 +85,16 @@ def index_file(es, types, data, opts):
     rows = csv.reader(
         data, delimiter=delimiters[types["file"]["format"]], quotechar='"'
     )
-    header = None
-    if types["file"].get("header", False):
+    if "header" in types["file"] and types["file"]["header"]:
         header = next(rows)
         set_column_indices(types, header)
+    else:
+        header = None
     with_ids = defaultdict(list)
     taxon_asm_data = defaultdict(list)
     without_ids = defaultdict(list)
     failed_rows = defaultdict(list)
+    imported_rows = []
     blanks = set(["", "NA", "N/A", "None"])
     taxon_types = {}
     for taxonomy_name in opts["taxonomy-source"]:
@@ -112,6 +115,7 @@ def index_file(es, types, data, opts):
                 taxon_asm_data[processed_data["taxonomy"]["taxon_id"]].append(
                     taxon_data
                 )
+                imported_rows.append(row)
             else:
                 if "taxonomy" in types and "alt_taxon_id" in types["taxonomy"]:
                     without_ids[processed_data["taxonomy"]["alt_taxon_id"]].append(
@@ -147,11 +151,15 @@ def index_file(es, types, data, opts):
             types=types,
             taxon_template=taxon_template,
             failed_rows=failed_rows,
+            imported_rows=imported_rows,
             with_ids=with_ids,
             blanks=blanks,
             header=header,
         )
         if with_ids or create_ids:
+            write_imported_rows(
+                imported_rows, opts, types=types, header=header, label="imported"
+            )
             LOGGER.info("Indexing %d entries", len(with_ids.keys()))
             if opts["index"] == "taxon":
                 docs = add_names_and_attributes_to_taxa(
@@ -164,6 +172,7 @@ def index_file(es, types, data, opts):
                     _op_type="update",
                 )
             elif opts["index"] == "assembly":
+                # TODO: keep track of taxon_id not found exceptions
                 assembly_template = assembly.index_template(taxonomy_name, opts)
                 docs = add_identifiers_and_attributes_to_assemblies(
                     es,
diff --git a/src/genomehubs/lib/taxon.py b/src/genomehubs/lib/taxon.py
index 19187de3..c60e7dd6 100644
--- a/src/genomehubs/lib/taxon.py
+++ b/src/genomehubs/lib/taxon.py
@@ -2,11 +2,9 @@
 
 """Taxon methods."""
 
-import os
 import sys
 from collections import defaultdict
 
-from tolkein import tofile
 from tolkein import tolog
 from tqdm import tqdm
 
@@ -17,6 +15,7 @@
 from .hub import add_attribute_values
 from .hub import chunks
 from .hub import index_templator
+from .hub import write_imported_rows
 from .taxonomy import index_template as taxonomy_index_template
 
 LOGGER = tolog.logger(__name__)
@@ -177,6 +176,7 @@ def fix_missing_ids(
     types,
     taxon_template,
     failed_rows,
+    imported_rows,
     with_ids=None,
     blanks=set(["NA", "None"]),
     header=None,
@@ -211,29 +211,15 @@ def fix_missing_ids(
     if without_ids and failed_rows:
         for key, value in found_ids.items():
             if key in failed_rows:
+                imported_rows += failed_rows[key]
                 del failed_rows[key]
         if failed_rows:
             LOGGER.info(
                 "Unable to associate %d records with taxon IDs", len(failed_rows)
             )
-            data = []
-            exception_key = "%s-exception" % opts["index"]
-            dir_key = "%s-dir" % opts["index"]
-            if exception_key in opts and opts[exception_key]:
-                outdir = opts[exception_key]
-            else:
-                outdir = "%s/exceptions" % opts[dir_key]
-            os.makedirs(outdir, exist_ok=True)
-            outfile = "%s/%s" % (outdir, types["file"]["name"])
-            if header:
-                data.append(header)
-            for rows in failed_rows.values():
-                for row in rows:
-                    data.append(row)
-            LOGGER.info(
-                "Writing %d records to exceptions file '%s", len(data) - 1, outfile
+            write_imported_rows(
+                failed_rows, opts, types=types, header=header, label="exceptions"
             )
-            tofile.write_file(outfile, data)
     return with_ids, without_ids