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.
Sakura Haruno (Naruto) is Tsunade's best student, able to use various ninjutsu techniques for treating injuries and even cleanse bodies of poison.
Shin Uchiha (Naruto) has advanced surgical skills which he combined with his Mangekyo Sharingan to transplant his clone's organs into himself.
Kanzaki Keine (Choujin Koukousei-tachi wa Isekai demo Yoyuu de Ikinuku you desu!) is a tremendously gifted master surgeon...
able to even resuscitate a recently dead patient of disembowelment while also curing him of gastric cancer.
Kureha Shinogi (Baki The Grappler) is a genius able to do surgeries that normally take several hours in only 30 minutes.
Isshi-100 (One Piece) is part of a group of doctors who are skilled enough to save a recently decapitated man back to life within minutes.
Urahara Kisuke (Bleach) Bankai Modification of the Crimson Princess' Dissection at the Doors of Avalokiteśvara has the ability to restructure the attribute of all things through surgical sutures...
...such as dissecting an enemy offensively...
..and restoring irreversibly damaged organs such as eyes.