and here the last ones, sorry for the delay:

Schäfer, Karl-Ernst Dr.med., MStA d.R. U-468
Schellbach, Herbert, Dr.med.,MStA, U-539
Schmelzer,... Dr.med.,...d.R. U-267
Schönberg, Walter, Dr.med. MOAss. d.R. U-762
Schubert,...,Dr.med. MStA d.R. U-758
Schwentafsky,Rudolf, Dr.med. MStA d.R. U-93,U-220,+28.10.43
Seyerlein,Hans Friedrich, Dr.med.MStA d.R. U-866
Siebert,Peter, Dr.med. MStA U-490 (no patrol)
Siemering,Günter, Dr.med.,MOAssA d.R.,U-3507
Springorum, Paul-Werner,Dr.med. MOAssAd.R. U-460
Steen,Klaus, Dr.med. MStA, U-621
Stenger, ... ,Dr.med. MStA d.R. U-461
Täger,Klaus, Dr.med. MStA d.R. U-46,U-65
Torge,Friedrich, Dr.med. MStA, U-550
Vole, Heinz, Dr.med. MStA d.R. U-172 +12.12.43
Wetzel,Hans-Karl, Dr.med. MStA U-413
Zapp, Alfred, Dr.med. MStA d.R. U-871,+26.9.44

source: Nöldeke/Hartmann, Der Sanitätsdienst in der deutschen U-Boot-Waffe