Gemeinsame Armee
In the Austria-Hungarian Common Army (de: Gemeinsame Armee or k.u.k. Armee) there was the rank "Oberstabsarzt 2. Klasse" (en: Senior staff surgeon 2nd class) until 1918 equivalent to "Oberfeldarzt" in Germany. That particular rank was comparable to the "Oberstleutnant" OF4-rank (en: colonel) as well.