Heaven Canceller (A Certain Magical Index) can heal anything, whether it is a terminal illness or mortal wounds, distorting the laws of heaven, so long as the patient is still alive.
Horatio Quentin Quack (Archie's Sonic the Hedgehog)
Fiona Fox (Archie's Sonic the Hedgehog) is knowledgeable in medicals.
Doc Ginger (Sonic Boom: Rise of Lyric)
Doctor (Black Cat) is very skilled in medicals, using soft chi kung to accelerate cellular functions, healing wounds, and reattaching limbs.
Retsu Unohana (Bleach) is considered the best healer in Soul Society.
Mayuri Kurotsuchi (Bleach) is very knowledgeable in medical science, having modified many people, including himself, in very innovative, yet disturbing, ways.
Szayelaporro Granz (Bleach) uses his scientific expertise to modify many of his subordinates for extra strength, or transform them into walking medicament.
Tenjirō Kirinji (Bleach) is the most powerful known healer, having taught Unohana many of her medical skills, personally, he specializes in balneotherapy, having invented powerful healing hot springs that not only cleanses bodies of impurities...
...but also instantly replenished lost blood.
Kanzaki Keine (Choujin Koukousei-tachi wa Isekai demo Yoyuu de Ikinuku you desu!) is a medical prodigy and the finest doctor in the world, having successfully saved thousands of patients without a single death.
Although psychotic and completely deranged, Professor Pyg (DC Comics) is an adept surgeon who can perform complicated surgeries.
As a former field medic, Alfred Pennyworth (DC Comics) can perform first aid and more complex medical procedures such as arthroscopy and other advanced surgery to suture grievous wounds and remove bullets, limiting the need for hospital care for the Batman Family.
A world-class surgeon and neurologist, Tommy Eliot/Hush (DC Comics) has achieved extraordinary, near-impossible medical breakthroughs with his talents alone...
...most infamously feat was a surgically stitched a collection of certain facial features from inmates in Arkham City to his own face to look exactly like Bruce Wayne.
Ra's al Ghul (DC Comics) was a genius master physician, whose medical knowledge was six hundred years ahead of his contemporaries. He even managed to refine the Lazarus Pit to bestow immortality and regeneration.
Dr. John Zoidberg (Futurama) was considered by Professor Farnsworth to be a fine physician for aliens despite his knowledge of human physiology being absolutely atrocious.
As the divine physician of Olympus, Apollo (Greek Mythology) is the Greek God of Medicine and Healing, not only can he give divine protection from epidemics but also induced deadly plague via his arrows.
Apollo's disciple, Chiron (Greek Mythology) is legendary as the founder of Greek herbalism and pharmacy.
The demi-god physician, Asclepius (Greek Mythology) has surpassed his father Apollo and mentor Chiron in the art of medicine, able to even heal others back to life from the brink of death and beyond.
Dr. Gregory House (House) is well-known for his excellent if unorthodox, methods of practicing medicine.
Before his car accident, Dr.Stephen Strange (Marvel Cinematic Universe) was one of the world's most renowned neurosurgeons.
Prior to becoming Big Boss' body double, Venom Snake (Metal Gear Solid V) was a talented combat medic, able to competently extract a bomb from Paz's abdomen without anesthetic and stitch her back up afterward.
A supremely skilled medical doctor, Para-Medic/Dr. Clark (Metal Gear series) gave Big Boss extensive advice on how to self-administer treatment for his wounds and eventually became head of FOXHOUND's medical staff...
...a position in which Naomi Hunter succeeded her following her death.
Tsunade (Naruto) is heralded as the Greatest Medical Ninja in History, able to perform even the most complicated surgeries and even developed the ultimate regeneration technique.
Orochimaru (Naruto) has tremendous knowledge of the human body, having studied so long to achieve immortality and drawing out human strength.
As Tsunade's first disciple, Shizune (Naruto) is one of Konoha's finest and greatest masters of medical ninjutsu...
...able to successfully perform the most difficult surgical ninjutsu such as the Healing Resuscitation Regeneration technique to save a mortally wounded Neji.
One of the best of his generation
, Kabuto Yakushi (Naruto) is a very powerful medical ninja, so full of surprising talent that even Tsunade believes him to surpass her during prime.
Sakura Haruno (Naruto) has inherited all of Tsunade's medical skills, being her second disciple, and is considered to be her equal in prime.
Obito Uchiha (Naruto) possesses such skill in surgery that he was able to transplant one of Madara Uchiha's Rinnegan into himself.
Chiyo (Naruto) was considered to be one of the best medical ninjas in Hidden Sand Village/Sunagakure, as she created many poisons, and can even transfer life force to bring the dead back to life and heal the injured.
Shinnō (Naruto) may have utter disregard for human life, but his immense knowledge in the human body allows him to perform flawless surgeries with only minor tools, and even enhance his own body.
Haku (Naruto) was a knowledgeable herbalist and also a master of acupuncture...
...using his Thousand Needles of Death to precisely strike all his enemies' pressure points to kill them painlessly.
Trafalgar D. Water Law (One Piece) is a genius surgeon, he can treat the most brutal injuries such as magma burns, and with his Ope Ope no Mi, he can perform miraculous surgeries to treat incurable diseases.
Caesar Clown (One Piece) has tremendous medical knowledge, as he could use his chemical expertise to apply to heal and turn children into giants, as well as create artificial Devil Fruit ingredients that affects a person's bloodline.
Doctor Kureha (One Piece) is one of the finest doctors in the world as she maintains her aging 141-year-old body in top physical health and condition and trained
Tony Tony Chopper into an outstanding medical doctor and expert.
The brilliant student of Kureha, Tony Tony Chopper (One Piece) is an extraordinarily multi-talented prodigy in all fields of medical science...
...even inventing his own personal drug, the Rumble Ball, to enhance his Devil Fruit powers.
The Torino Tribe (One Piece) are the world's foremost masters of herbalism and pharmacology,...
...having researched and developed a massive collection of powerful medicines, far more advanced than most countries.
Rebecca Chambers (Resident Evil) possesses extensive knowledge in medical science.
Johann Faust VIII (Shaman King) has extraordinary talent in medical science. He could cure Eliza of an incurable disease and come up with unorthodox and gruesome, but effective healing methods such as deboning fractured bones to replace it with bones from corpses.
A surgical genius, Cioccolata's (JoJo’s Bizarre Adventure Part V/5: Golden Wind/Vento Aureo) sick medical experiments on his patients gave him an intimate knowledge of the human body, especially which body parts he can cut while preserving his victim's life...
...and with his surgery skills, he could perform surgery on himself quickly enough to bisect and reattach his own body.
Dr. Mario (Super Mario) is an excellent physician, having created special Megavitamins that can cure a common cold and the flu.
Asclepius (Valkyrie Crusade)
Minoru Kamiya (Yu Yu Hakusho) has medical knowledge as knowing the by striking certain pressure points/joints.
Oregano (Sora No Otoshimono) is a Medical Specialist Angeloid with an advanced medical system for accessing illness and injuries and restoring them to back to health
Horace Diaz (Mighty Med) is the greatest Doctor at Mighty Med Hospital beside his apprentices Kaz and Oliver.
Shin Walford (Wise Man's Grandson) applied modern medical knowledge of human anatomy into his Abjuration magic skills to heal injuries more effectively, restoring the body of dying patients at a cellular level.
Shirayuki (Akagami no Shirayuki-hime) is an extraordinary herbalist.
Mage Meadowbrook (My Little Pony: Friendship is Magic)
Ayesha Altugle (Atelier Ayesha: The Alchemist of Dusk) is talented in making all sorts of remedies and medications.
Meddy.EXE (Mega Man Battle Network 5)
Akihiro Kanou (Tokyo Ghoul) is a brilliant surgeon, even creating a procedure to create artificial one-eyed ghouls by transplanting a kakuhou into humans.
Jonathan Reid (Vampyr) is a renowned surgeon and blood specialist, even serving as a medic during World War I.
Particularly skilled in the esoteric applications of medical qigong, Kyou Kai (Kingdom) is one of the resident medical experts and healers in the Hi Shin Army...
...thanks to her Shiyuu knowledge on chi, she can harness her own Chi to speed a person's recovery time as she did for Ri Shin after their duel and battle with Clan Gouma...
...and with knowledge on rare herbs and plants, she can create potent and effective medical ointments that can mend and boost a person's healing rate like with Ri Shin as he nearly lost his arm after a bloody duel with Rin Ko of the Four Heavenly Kings and Ou Hon as he nearly died after his fight with Gyou'un.
Kikyō (InuYasha) is extremely talented in Japanese Kampo medicine, having managed to save numerous lives despite the poor health care quality of the Sengoku era.
Ajay "Lifeline" Che (Apex Legends) can heal and revive her squad mates rapidly, with the aid of her D.O.C Drone.
Dr. Henry "Hank" McCoy (Marvel Comics) is an extraordinary medical genius in genetics and biochemistry, having managed to cured the Legacy Virus a deadly mutated plague which can kill even mutants.
Doraemon (Doraemon) has sufficient medical knowledge and training to used 22nd century Health technology to analyze and cure illness and diseases.
Satou Pendragon (Death March Kara Isekai Hajimaru) has exceptional alchemy talent to brew the highest quality medicinal potions for healing illness and injuries.
Queen (One Piece) is a genius virologist, in inventing abnormal viruses and creating antitodes for them as a countermeasure,
Crocus (One Piece) is one of the greatest doctors in the world, being the only doctor who could suppressed Gol D. Roger's incurable disease, prolonging the latter's life long enough to reach Laugh Tale and conquer the Grand Line.
Azuza Aizawa (I've Been Killing Slimes for 300 Years and Maxed Out My Level) is a master herbalist, having once managed to cure a plague.
Dian Cecht Familia (DanMachi) is the best medicinal type familia of Orario,
producing various types of medicine, healing potions and elixirs of extremely high quality.
Porlyusica/Edolas Grandenney (Fairy Tail) is the hermit witch doctor of Fairy Tail.
Sei Takanashi (Seijo No Maryoku Wa Bannou Desu) is an avid herbalist, applying modern herbalism into magic to brew the most effective medicinal potions.
Shinobu Kocho (Demon Slayer: Kimetsu no Yaiba) has immense talent in medical and pharmaceutical fields, able to modify her own body to become lethelly poisonous to Demons as well as create antidotes to counteract Demon's poison and venom.
Tamayo (Demon Slayer: Kimetsu no Yaiba) has profound medical skills comparable to Shinobu.
Kureha Shinogi (Baki The Grappler) is a surgical genius, able to finished long lasting difficult surgeries in a short period of time.
Isshi 100 (One Piece) are the most highly skilled doctors of Sakura Kingdom lead by Doctor Kureha.
Madara Uchiha (Naruto) has profound medical skills, such as modifying his physiology with Hashirama's DNA, and extended his lifespan with the Gedo Statue,
eventually doing the same to a dying Obito, saving his life and restored his permanently damaged body to optimal condition.
Dr. Genus (One-Punch Man) was able to unlocked medical secrets of genetic science.
which he used to restored his declining health, making him physically fit in his prime.
Having learnt from Orochimaru, Shin Uchiha (Naruto) has advanced skills in medical science and ninjutsu
Kanji Yakutani (Isekai Yakkyoku) is genius medical researcher who have invented new medicines for incurable illness, even doing the same in his next life as Falma.
Hogback (One Piece) is a genius surgeon who have saved countless patients with what was described as miraculous surgeries.