diff --git a/fieldExtraction/constants/constants.py b/fieldExtraction/constants/constants.py
index 14b96c5..d695a7f 100644
--- a/fieldExtraction/constants/constants.py
+++ b/fieldExtraction/constants/constants.py
@@ -124,6 +124,16 @@ class Constants:
             .from_excel("constants/mapping_csvs/rev_cd/rev.csv", "Code", "Description")
             .mapping
         )
+        self.GROUPER_APR_DRG_MAPPING = (
+            CrosswalkBuilder()
+            .from_excel("constants/mapping_csvs/grouper_cd/drg_mapping_apr-drg.csv", "Code", "Description")
+            .mapping
+        )
+        self.GROUPER_MS_DRG_MAPPING = (
+            CrosswalkBuilder()
+            .from_excel("constants/mapping_csvs/grouper_cd/drg_mapping_ms-drg.csv", "Code", "Description")
+            .mapping
+        )
 
         self.BILL_TYPE_MAPPING = (
             CrosswalkBuilder()
diff --git a/fieldExtraction/src/codes/code_funcs.py b/fieldExtraction/src/codes/code_funcs.py
index 7ef69e2..fcaec9a 100644
--- a/fieldExtraction/src/codes/code_funcs.py
+++ b/fieldExtraction/src/codes/code_funcs.py
@@ -426,6 +426,40 @@ def fill_bill_type(service, answer_dict, BILL_TYPE_MAPPING, BILL_TYPE_REVERSE_MA
     return answer_dict
 
 
+def fill_grouper_cd_desc(answer_dict, constants: Constants):
+    """
+    Fills the GROUPER_CD_DESC field in the answer dictionary based on the GROUPER_CD.
+
+    Args:
+        answer_dict (dict): The answer dictionary to update.
+
+    Returns:
+        dict: The updated answer dictionary.
+    """
+
+    grouper_cd = answer_dict.get("GROUPER_CD")
+    if string_utils.is_empty(grouper_cd):
+        return answer_dict
+    grouper_type = answer_dict.get("GROUPER_TYPE")
+    if string_utils.is_empty(grouper_type):
+        return answer_dict
+
+    grouper_descs = []
+    grouper_cd = eval(grouper_cd) if "[" in grouper_cd else grouper_cd
+
+    for code in grouper_cd:
+        code_without_severity = int(code.split("-")[0])  # Remove severity level if present
+        if grouper_type == "APR-DRG" and (code_without_severity in constants.GROUPER_APR_DRG_MAPPING):
+            grouper_descs.append(constants.GROUPER_APR_DRG_MAPPING[code_without_severity])
+        elif grouper_type == "MS-DRG" and (code_without_severity in constants.GROUPER_MS_DRG_MAPPING):
+            grouper_descs.append(constants.GROUPER_MS_DRG_MAPPING[code_without_severity])
+
+    if grouper_descs:
+        answer_dict["GROUPER_CD_DESC"] = "|".join(list(set(grouper_descs)))
+
+    return answer_dict
+
+
 def get_implicit_runs(answer_dict):
     """
     Determines which code runs should be executed implicitly based on the Claim Type and Bill Type
@@ -620,6 +654,11 @@ def code_breakout(merged_results: pd.DataFrame, constants: Constants):
         answer_dict.update(code_answer_dict)
         answer_dicts_with_code.append(answer_dict)
 
+    # Fill in GROUPER_CD_DESC based on GROUPER_TYPE and GROUPER_CD
+    answer_dicts_with_code = [
+        fill_grouper_cd_desc(answer_dict, constants) for answer_dict in answer_dicts_with_code
+    ]
+
     return pd.DataFrame(answer_dicts_with_code)