We only use a few 10 codes
10-4 Acknowledge
10-5 Transporting Non-Emergency
10-6 Busy
10-7 Out of Service
10-8 In Service / Enroute to call
10-9 Repeat
10-10 Out of the unit
10-15 Transporting Emergency Patient
10-19 Enroute to station
10-20 or just 20 Location
10-21 or just 21 Call by phone
10-22 Disreguard
10-50 Negative
10-97 or 97 On scene
10-98 or 98 Completed last assignment
98 8 is Completed last assignment in service
Hope this helps. If you have any question email me
a.j.powell@us.army.mil