The AFRN Talkgroup listings here at RR show a HEAR 800 – Hospital Emergency Administrative Radio group. For some reason that listing is under the ‘Alabama Law Enforcement Agency Talkgroups’. Also, under the ‘System Wide Interoperability Talkgroups’, Lifesaver & Medflight have talkgroups.
The National 700 MHz InterOp Plan has several numbered Air to Ground channels for public safety agencies.
I cannot verify usage on any of the above.