diff --git a/lib/aba_file_validator.ex b/lib/aba_file_validator.ex
index 2ecbb62..4c044d8 100644
--- a/lib/aba_file_validator.ex
+++ b/lib/aba_file_validator.ex
@@ -8,11 +8,30 @@ defmodule AbaFileValidator do
 
   ## Examples
 
-      iex> AbaFileValidator.hello()
-      :world
+      iex> AbaFileValidator.get_transaction_code_description("11")
+      :not_provided
+
+      iex> AbaFileValidator.get_transaction_code_description(13)
+      "Externally initiated debit items"
 
   """
-  def hello do
-    :world
-  end
+  def get_transaction_code_description(13), do: "Externally initiated debit items"
+  def get_transaction_code_description("13"), do: "Externally initiated debit items"
+  def get_transaction_code_description(50), do: "Externally initiated credit items with the exception of those bearing Transaction Codes"
+  def get_transaction_code_description("50"), do: "Externally initiated credit items with the exception of those bearing Transaction Codes"
+  def get_transaction_code_description(51), do: "Australian Government Security Interest"
+  def get_transaction_code_description("51"), do: "Australian Government Security Interest"
+  def get_transaction_code_description(52), do: "Family Allowance"
+  def get_transaction_code_description("52"), do: "Family Allowance"
+  def get_transaction_code_description(53), do: "Pay"
+  def get_transaction_code_description("53"), do: "Pay"
+  def get_transaction_code_description(54), do: "Pension"
+  def get_transaction_code_description("54"), do: "Pension"
+  def get_transaction_code_description(55), do: "Allotment"
+  def get_transaction_code_description("55"), do: "Allotment"
+  def get_transaction_code_description(56), do: "Dividend"
+  def get_transaction_code_description("56"), do: "Dividend"
+  def get_transaction_code_description(57), do: "Debenture/Note Interest"
+  def get_transaction_code_description("57"), do: "Debenture/Note Interest"
+  def get_transaction_code_description(_), do: :not_provided
 end
diff --git a/test/aba_file_validator_test.exs b/test/aba_file_validator_test.exs
index 709b08e..a58bc76 100644
--- a/test/aba_file_validator_test.exs
+++ b/test/aba_file_validator_test.exs
@@ -2,7 +2,25 @@ defmodule AbaFileValidatorTest do
   use ExUnit.Case
   doctest AbaFileValidator
 
-  test "greets the world" do
-    assert AbaFileValidator.hello() == :world
+  test "transaction code description" do
+    assert AbaFileValidator.get_transaction_code_description(11) == :not_provided
+    assert AbaFileValidator.get_transaction_code_description(13) == "Externally initiated debit items"
+    assert AbaFileValidator.get_transaction_code_description("13") == "Externally initiated debit items"
+    assert AbaFileValidator.get_transaction_code_description(50) == "Externally initiated credit items with the exception of those bearing Transaction Codes"
+    assert AbaFileValidator.get_transaction_code_description("50") == "Externally initiated credit items with the exception of those bearing Transaction Codes"
+    assert AbaFileValidator.get_transaction_code_description(51) == "Australian Government Security Interest"
+    assert AbaFileValidator.get_transaction_code_description("51") == "Australian Government Security Interest"
+    assert AbaFileValidator.get_transaction_code_description(52) == "Family Allowance"
+    assert AbaFileValidator.get_transaction_code_description("52") == "Family Allowance"
+    assert AbaFileValidator.get_transaction_code_description(53) == "Pay"
+    assert AbaFileValidator.get_transaction_code_description("53") == "Pay"
+    assert AbaFileValidator.get_transaction_code_description(54) == "Pension"
+    assert AbaFileValidator.get_transaction_code_description("54") == "Pension"
+    assert AbaFileValidator.get_transaction_code_description(55) == "Allotment"
+    assert AbaFileValidator.get_transaction_code_description("55") == "Allotment"
+    assert AbaFileValidator.get_transaction_code_description(56) == "Dividend"
+    assert AbaFileValidator.get_transaction_code_description("56") == "Dividend"
+    assert AbaFileValidator.get_transaction_code_description(57) == "Debenture/Note Interest"
+    assert AbaFileValidator.get_transaction_code_description("57") == "Debenture/Note Interest"
   end
 end