The MERCI channels are 155.340 ("MERCI 340"), 155.400 ("MERCI 400"), 155.280 ("MERCI 280") and occasionally 155.160 ("MERCI 160").
While other areas call them MERCI 1, 2, 3 etc., 154.430 is not one of the MERCI channels, it is basically a fire dispatch channel in many areas.
All that said, it well could be what is used for med choppers in some areas, but just not as a MERCI Channel.
I could be mistaken, but I believe that is one of the "Merci" channels. Possibly 3 or 4, mainly used for ambulance or air-medics to talk to the hospital. Around here it is "Merci 1" which is what Airlife and Arch use when coming to Carle Hospital.
Ian