diff --git a/openair2/COMMON/e1ap_messages_types.h b/openair2/COMMON/e1ap_messages_types.h
index ccac11b19d..adcff5e8cd 100644
--- a/openair2/COMMON/e1ap_messages_types.h
+++ b/openair2/COMMON/e1ap_messages_types.h
@@ -615,5 +615,14 @@ typedef struct e1ap_lost_connection_t {
   int dummy;
 } e1ap_lost_connection_t;
 
+/// @brief 9.2.2.6 BEARER CONTEXT MODIFICATION FAILURE
+typedef struct e1ap_bearer_context_mod_failure_s {
+  // gNB-CU-CP UE E1AP ID (M)
+  uint32_t gNB_cu_cp_ue_id;
+  // gNB-CU-UP UE E1AP ID (M)
+  uint32_t gNB_cu_up_ue_id;
+  // NG-RAN PDU Session Resource Modified List (O)
+  e1ap_cause_t cause;
+} e1ap_bearer_context_mod_failure_t;
 
 #endif /* E1AP_MESSAGES_TYPES_H */
diff --git a/openair2/E1AP/lib/e1ap_bearer_context_management.c b/openair2/E1AP/lib/e1ap_bearer_context_management.c
index 81ac737cf6..b14d132880 100644
--- a/openair2/E1AP/lib/e1ap_bearer_context_management.c
+++ b/openair2/E1AP/lib/e1ap_bearer_context_management.c
@@ -2128,3 +2128,101 @@ void free_e1ap_context_mod_response(const e1ap_bearer_modif_resp_t *msg)
     free(msg->pduSessionMod[i].ng_DL_UP_TL_info);
   }
 }
+
+/* ===========================================
+ *   E1AP Bearer Context Modification Failure
+ * ============================================ */
+
+/** @brief Bearer Context Modification Failure encoding (9.2.2.6 38.463)
+ *         gNB-CU-UP → gNB-CU-CP */
+struct E1AP_E1AP_PDU *encode_E1_bearer_context_mod_failure(const e1ap_bearer_context_mod_failure_t *msg)
+{
+  E1AP_E1AP_PDU_t *pdu = calloc_or_fail(1, sizeof(*pdu));
+  pdu->present = E1AP_E1AP_PDU_PR_unsuccessfulOutcome;
+  asn1cCalloc(pdu->choice.unsuccessfulOutcome, type);
+  type->procedureCode = E1AP_ProcedureCode_id_bearerContextModification;
+  type->criticality = E1AP_Criticality_reject;
+  type->value.present = E1AP_UnsuccessfulOutcome__value_PR_BearerContextModificationFailure;
+  E1AP_BearerContextModificationFailure_t *out = &type->value.choice.BearerContextModificationFailure;
+  // gNB-CU-CP UE E1AP ID (M)
+  asn1cSequenceAdd(out->protocolIEs.list, E1AP_BearerContextModificationFailureIEs_t, ie1);
+  ie1->id = E1AP_ProtocolIE_ID_id_gNB_CU_CP_UE_E1AP_ID;
+  ie1->criticality = E1AP_Criticality_reject;
+  ie1->value.present = E1AP_BearerContextModificationFailureIEs__value_PR_GNB_CU_CP_UE_E1AP_ID;
+  ie1->value.choice.GNB_CU_CP_UE_E1AP_ID = msg->gNB_cu_cp_ue_id;
+  // gNB-CU-UP UE E1AP ID (M)
+  asn1cSequenceAdd(out->protocolIEs.list, E1AP_BearerContextModificationFailureIEs_t, ie2);
+  ie2->id = E1AP_ProtocolIE_ID_id_gNB_CU_UP_UE_E1AP_ID;
+  ie2->criticality = E1AP_Criticality_reject;
+  ie2->value.present = E1AP_BearerContextModificationFailureIEs__value_PR_GNB_CU_UP_UE_E1AP_ID;
+  ie2->value.choice.GNB_CU_UP_UE_E1AP_ID = msg->gNB_cu_up_ue_id;
+  // Cause (M)
+  asn1cSequenceAdd(out->protocolIEs.list, E1AP_BearerContextModificationFailureIEs_t, ie3);
+  ie3->id = E1AP_ProtocolIE_ID_id_Cause;
+  ie3->criticality = E1AP_Criticality_reject;
+  ie3->value.present = E1AP_BearerContextModificationFailureIEs__value_PR_Cause;
+  ie3->value.choice.Cause = e1_encode_cause_ie(&msg->cause);
+  return pdu;
+}
+
+/** @brief Bearer Context Modification Failure decoding (9.2.2.6 38.463)
+ *         gNB-CU-UP → gNB-CU-CP */
+bool decode_E1_bearer_context_mod_failure(e1ap_bearer_context_mod_failure_t *out, const E1AP_E1AP_PDU_t *pdu)
+{
+  DevAssert(pdu != NULL);
+  _E1_EQ_CHECK_INT(pdu->present, E1AP_E1AP_PDU_PR_unsuccessfulOutcome);
+  E1AP_UnsuccessfulOutcome_t *type = pdu->choice.unsuccessfulOutcome;
+  _E1_EQ_CHECK_LONG(type->procedureCode, E1AP_ProcedureCode_id_bearerContextModification);
+  _E1_EQ_CHECK_INT(type->value.present, E1AP_UnsuccessfulOutcome__value_PR_BearerContextModificationFailure);
+  const E1AP_BearerContextModificationFailure_t *in = &type->value.choice.BearerContextModificationFailure;
+  // Check mandatory IEs first
+  E1AP_BearerContextModificationFailureIEs_t *ie;
+  E1AP_LIB_FIND_IE(E1AP_BearerContextModificationFailureIEs_t, ie, in, E1AP_ProtocolIE_ID_id_gNB_CU_CP_UE_E1AP_ID, true);
+  E1AP_LIB_FIND_IE(E1AP_BearerContextModificationFailureIEs_t, ie, in, E1AP_ProtocolIE_ID_id_gNB_CU_UP_UE_E1AP_ID, true);
+  E1AP_LIB_FIND_IE(E1AP_BearerContextModificationFailureIEs_t, ie, in, E1AP_ProtocolIE_ID_id_Cause, true);
+  for (int i = 0; i < in->protocolIEs.list.count; i++) {
+    ie = in->protocolIEs.list.array[i];
+    AssertFatal(ie != NULL, "in->protocolIEs.list.array[i] shall not be null");
+    switch (ie->id) {
+      case E1AP_ProtocolIE_ID_id_gNB_CU_CP_UE_E1AP_ID:
+        out->gNB_cu_cp_ue_id = ie->value.choice.GNB_CU_CP_UE_E1AP_ID;
+        break;
+      case E1AP_ProtocolIE_ID_id_gNB_CU_UP_UE_E1AP_ID:
+        out->gNB_cu_up_ue_id = ie->value.choice.GNB_CU_UP_UE_E1AP_ID;
+        break;
+      case E1AP_ProtocolIE_ID_id_Cause:
+        out->cause = e1_decode_cause_ie(&ie->value.choice.Cause);
+        break;
+      default:
+        PRINT_ERROR("Invalid or unhandled optional IE (%ld) in Bearer Context Modification Failure message\n", ie->id);
+        break;
+    }
+  }
+  return true;
+}
+
+/** @brief E1AP Bearer Context Modification Failure: deep copy */
+e1ap_bearer_context_mod_failure_t cp_E1_bearer_context_mod_failure(const e1ap_bearer_context_mod_failure_t *msg)
+{
+  e1ap_bearer_context_mod_failure_t cp = {0};
+  cp = *msg;
+  return cp;
+}
+
+/** @brief E1AP Bearer Context Modification Failure: equality check */
+bool eq_E1_bearer_context_mod_failure(const e1ap_bearer_context_mod_failure_t *a, const e1ap_bearer_context_mod_failure_t *b)
+{
+  if (!a || !b)
+    return false; // Null-check both inputs
+  _E1_EQ_CHECK_INT(a->gNB_cu_cp_ue_id, b->gNB_cu_cp_ue_id);
+  _E1_EQ_CHECK_INT(a->gNB_cu_up_ue_id, b->gNB_cu_up_ue_id);
+  _E1_EQ_CHECK_INT(a->cause.type, b->cause.type);
+  _E1_EQ_CHECK_INT(a->cause.value, b->cause.value);
+  return true;
+}
+
+/** @brief E1AP Bearer Context Modification Failure: free */
+void free_E1_bearer_context_mod_failure(const e1ap_bearer_context_mod_failure_t *msg)
+{
+  // do nothing
+}
diff --git a/openair2/E1AP/lib/e1ap_bearer_context_management.h b/openair2/E1AP/lib/e1ap_bearer_context_management.h
index fb8c57e011..6565f31749 100644
--- a/openair2/E1AP/lib/e1ap_bearer_context_management.h
+++ b/openair2/E1AP/lib/e1ap_bearer_context_management.h
@@ -52,4 +52,10 @@ void free_e1ap_context_mod_response(const e1ap_bearer_modif_resp_t *msg);
 e1ap_bearer_modif_resp_t cp_bearer_context_mod_response(const e1ap_bearer_modif_resp_t *msg);
 bool eq_bearer_context_mod_response(const e1ap_bearer_modif_resp_t *a, const e1ap_bearer_modif_resp_t *b);
 
+struct E1AP_E1AP_PDU *encode_E1_bearer_context_mod_failure(const e1ap_bearer_context_mod_failure_t *msg);
+bool decode_E1_bearer_context_mod_failure(e1ap_bearer_context_mod_failure_t *out, const struct E1AP_E1AP_PDU *pdu);
+void free_E1_bearer_context_mod_failure(const e1ap_bearer_context_mod_failure_t *msg);
+e1ap_bearer_context_mod_failure_t cp_E1_bearer_context_mod_failure(const e1ap_bearer_context_mod_failure_t *msg);
+bool eq_E1_bearer_context_mod_failure(const e1ap_bearer_context_mod_failure_t *a, const e1ap_bearer_context_mod_failure_t *b);
+
 #endif /* E1AP_BEARER_CONTEXT_MANAGEMENT_H_ */
diff --git a/openair2/E1AP/tests/e1ap_lib_test.c b/openair2/E1AP/tests/e1ap_lib_test.c
index 68ce89cae1..e7102bc904 100644
--- a/openair2/E1AP/tests/e1ap_lib_test.c
+++ b/openair2/E1AP/tests/e1ap_lib_test.c
@@ -617,6 +617,49 @@ static void test_bearer_context_modification_response_fail(void)
   free_e1ap_context_mod_response(&orig);
 }
 
+/** @brief Test E1AP Bearer Context Modification Failure encoding/decoding */
+static void test_bearer_context_modification_failure(void)
+{
+  // Create the original failure struct
+  e1ap_bearer_context_mod_failure_t orig = {
+      .gNB_cu_cp_ue_id = 0x1111,
+      .gNB_cu_up_ue_id = 0x2222,
+      .cause.type = E1AP_CAUSE_TRANSPORT,
+      .cause.value = E1AP_TRANSPORT_CAUSE_RESOURCE_UNAVAILABLE,
+  };
+
+  // Encode the original message
+  E1AP_E1AP_PDU_t *enc = encode_E1_bearer_context_mod_failure(&orig);
+
+  // Decode the encoded message
+  E1AP_E1AP_PDU_t *dec = e1ap_encode_decode(enc);
+
+  // Free the encoded message
+  e1ap_msg_free(enc);
+
+  // Decode into a new struct
+  e1ap_bearer_context_mod_failure_t decoded = {0};
+  AssertFatal(decode_E1_bearer_context_mod_failure(&decoded, dec),
+              "decode_E1_bearer_context_mod_failure(): could not decode message\n");
+
+  // Free the decoded PDU
+  e1ap_msg_free(dec);
+
+  // Compare original and decoded messages
+  AssertFatal(eq_E1_bearer_context_mod_failure(&orig, &decoded),
+              "eq_E1_bearer_context_mod_failure(): decoded message doesn't match\n");
+
+  // Deep copy the original message
+  e1ap_bearer_context_mod_failure_t cp = cp_E1_bearer_context_mod_failure(&orig);
+
+  // Compare original and copied messages
+  AssertFatal(eq_E1_bearer_context_mod_failure(&orig, &cp), "eq_E1_bearer_context_mod_failure(): copied message doesn't match\n");
+
+  // Free the decoded and copied messages
+  free_E1_bearer_context_mod_failure(&decoded);
+  free_E1_bearer_context_mod_failure(&cp);
+}
+
 int main()
 {
   // E1 Bearer Context Setup
@@ -626,9 +669,10 @@ int main()
   test_e1_cuup_setup_request();
   test_e1_cuup_setup_response();
   test_e1_cuup_setup_failure();
-  // E1 Bearer Context Modification Request
+  // E1 Bearer Context Modification
   test_bearer_context_modification_request();
   test_bearer_context_modification_response();
   test_bearer_context_modification_response_fail();
+  test_bearer_context_modification_failure();
   return 0;
 }