According to the ADAC website (see
ADAC-Hubschrauber-Flotte), the ADAC fleet consists of 21 EC-135s.
I however would tend to agree with the numbers that "skadi" gave above, i.e. 3 T1, 6 P1 and 15 P2. Now it should be noted that one of the mentioned 15 EC-135 P2s (D-HDCL) belongs to a sister company of the ADAC, called Elbe Helicopter and is based in Bautzen as a backup machine for Elbe Helicopter's BK-117.