Professor Pyg (DC Comics) is an insane but skilled surgeon being capable of reanimating the dead and even operate on himself.
Fran Madaraki (Franken Fran) possess surgical skills so advanced that she often turns regular people into unrecognizable monsters...
Like a girl who wanted to look more like an anime character but was turned into a horrific, alien-like abomination.
Neferpitou (HunterXHunter) using her Nen ability Doctor Blythe.
Doctor (Valkyrie Crusade) is a legendary brilliant doctor and surgeon who can cure anything, her surgery skills being called holy.
Trafalgar D. Water Law (One Piece) use the spatial manipulation powers of the Ope Ope no Mi to freely mutilate and modify people in a surgical manner, he can also used it to miraculously removed incurable diseases from patients's bodies.
Genjuro (Flame of Recca) is an accomplished physician who utilizes nothing but his magic hands to fiddle with DNA.
Biomon (Digimon) is an Appmon that preforms the most difficult surgeries even turning normal humans into other appmon.