Thanks to all for your insights. I was able to get this question in with Los Angeles Center last week while airborne. The controller told me that regardless of the emergency code entered into the transponder (ads-b), his screen will only see the aircraft's callsign and a nondistinct code other than what was originally assigned but not anything specific. He further stated that operators need to verbally tell the controller the nature of the actual emergency since their ground systems can not distinguish the specific code entered into the transponder. i guess i'll go with that. thanks again.
stay safe,