Kureha Shinogi (Baki The Grappler) is a genius able to do surgeries that normally take several hours in only 30 minutes.
Kisuke Urahara's (Bleach) Bankai, Kannonbiraki Benihime Aratame, can restructure the attributes of all things through surgical sutures...
...such as dissecting an enemy offensively...
..and restoring irreversibly damaged organs such as eyes.
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...
... and even alter a patient's personality through brain surgery...
... turning a corrupt man into a compassionate humanitarian by modifying his brain.
Lazlo Valentin/Professor Pyg (DC Comics) is an insane but skilled surgeon being capable of reanimating the dead and even operate on himself.
Biomon (Digimon) is an Appmon that preforms the most difficult surgeries even turning normal humans into other appmon.
Genjuro (Flame of Recca) is an accomplished physician who utilizes nothing but his magic hands to fiddle with DNA.
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.
Misuzu Kanzaki (In Another World, I'm Called: the Black Healer) with her mastery of medical magic can perform any type of complicated medical surgeries.
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/Boruto: Naruto Next Generations) has advanced surgical skills which he combined with his Mangekyo Sharingan to transplant his clone's organs into himself.
Isshi-100/100 MDs (One Piece) is part of a group of doctors who are skilled enough to save a recently decapitated man back to life within minutes.
Already a skilled surgeon, Trafalgar D. Water Law (One Piece) can use the Spatial Manipulation powers of his Ope Ope no Mi to mutilate and modify people in a surgical manner, or to remove incurable diseases from patients' bodies.
After barely surviving being hit by the seatrain Puffing Tom, Franky (One Piece) used his inner Science Intuition and inventing skills to operated on his entire front body and transforming himself into a Super bionic cyborg.
Doctor (Valkyrie Crusade) is a legendary brilliant doctor and surgeon who can cure anything, her surgery skills being called holy.