diff --git a/sonic_platform_base/sonic_xcvr/api/public/cmis.py b/sonic_platform_base/sonic_xcvr/api/public/cmis.py
index a550b22..621b557 100644
--- a/sonic_platform_base/sonic_xcvr/api/public/cmis.py
+++ b/sonic_platform_base/sonic_xcvr/api/public/cmis.py
@@ -779,6 +779,14 @@ def get_module_pwr_down_duration(self):
         duration = self.xcvr_eeprom.read(consts.MODULE_PWRDN_DURATION)
         return float(duration) if duration is not None else 0
 
+    def is_tx_tunable(self):
+        '''
+        Returns True if transmitter is tunable(Page04h and 12h supported)
+        '''
+        if self.is_flat_memory():
+            return False
+        return self.xcvr_eeprom.read(consts.TX_TUNABLE_SUPPORT_FIELD)
+
     def get_host_lane_count(self):
         '''
         This function returns number of host lanes for default application
diff --git a/sonic_platform_base/sonic_xcvr/fields/consts.py b/sonic_platform_base/sonic_xcvr/fields/consts.py
index 68ff4b2..c5573dc 100644
--- a/sonic_platform_base/sonic_xcvr/fields/consts.py
+++ b/sonic_platform_base/sonic_xcvr/fields/consts.py
@@ -55,6 +55,7 @@
 TX_FAULT_SUPPORT_FIELD = "TxFaultSupported"
 TX_DISABLE_FIELD = "TxDisable"
 TX_DISABLE_SUPPORT_FIELD = "TxDisableSupported"
+TX_TUNABLE_SUPPORT_FIELD = "TxTunableSupported"
 
 TX_POWER_FIELD = "TxPower"
 TX_POWER_SUPPORT_FIELD = "TxPowerSupported"
diff --git a/sonic_platform_base/sonic_xcvr/mem_maps/public/cmis.py b/sonic_platform_base/sonic_xcvr/mem_maps/public/cmis.py
index 8702e76..b6bb219 100644
--- a/sonic_platform_base/sonic_xcvr/mem_maps/public/cmis.py
+++ b/sonic_platform_base/sonic_xcvr/mem_maps/public/cmis.py
@@ -213,6 +213,7 @@ def __init__(self, codes):
             ),
             NumberRegField(consts.CTRLS_ADVT_FIELD, self.getaddr(0x1, 155),
                 RegBitField(consts.TX_DISABLE_SUPPORT_FIELD, 1),
+                RegBitField(consts.TX_TUNABLE_SUPPORT_FIELD, 6),
                 size=2, format="<H"
             ),
             NumberRegField(consts.TX_FLAGS_ADVT_FIELD, self.getaddr(0x1, 157),
diff --git a/sonic_platform_base/sonic_xcvr/xcvr_api_factory.py b/sonic_platform_base/sonic_xcvr/xcvr_api_factory.py
index 5cc9558..6883767 100644
--- a/sonic_platform_base/sonic_xcvr/xcvr_api_factory.py
+++ b/sonic_platform_base/sonic_xcvr/xcvr_api_factory.py
@@ -85,7 +85,7 @@ def create_xcvr_api(self):
                 xcvr_eeprom = XcvrEeprom(self.reader, self.writer, mem_map)
                 api = CmisApi(xcvr_eeprom)
 
-            if api.is_coherent_module():
+            if api.is_tx_tunable():
                 mem_map = CCmisMemMap(codes)
                 xcvr_eeprom = XcvrEeprom(self.reader, self.writer, mem_map)
                 api = CCmisApi(xcvr_eeprom)