I guess the tricky question is, will AdComs understand the difference without a lengthy explanation? I know when I mention it to people, I usually have to explain the distinction. The general public doesn't understand that there are different types of ambulance service providers. AdCom members might be more informed, or they might not. When I worked in the hospital, the doctors just knew that they called a phone number, and an ambulance showed up to transfer the patient. I don't think they thought about how that particular ambulance crew only does transfers, not 911 calls.
That said, if you have the space to work it in, I don't think it would hurt! If not, I wouldn't worry about it. Every character is precious, and brevity is golden. I'm not planning on distinguishing between the two on my app, but my mind could change 100 times between now and June.