Saijou Mikoto was born with a bad heart. It was thanks to the incredible skills of Japanese leading pediatric heart surgeon, Shindou Mamoru, that he survived into adolescence, and he's decided to show his gratitude by becoming the greatest pediatric surgeon the world has ever known.

I was supposed to be dead, but when I woke up, I was a rat!
...or, more accurately, I became a virus and infested a rat!!
The more I infect, the more bodies and skills I get!
I'm going to cause a pandemic in this other world!

Web Novel (Japanese): https://ncode.syosetu.com/n9004es/

A catastrophic event has thrust the world into an age where disease begets disease. Ostracized for his unconventional treatment methods, the dark Doctor Ikuru is stricken with an immortalizing disease. On a desperate mission to die, he must save a world desperate to live. This medical science-fiction adventure will go to the very edge of humanity and back in one man's search for an ending to his suffering, all while saving the world he wishes to leave.

(Source: MANGA Plus)

Note: The manga got originally published as a short series of 4 chapters on February, 2020 in Shounen Jump +. On September 6, 2022, the manga got serialized and its 4 original chapters got republished as part of the serialization.

A status window appeared in front of Ryu Young-jun, a researcher at a pharmaceutical company.
Rosalin's status window, an artificial cell that knows everything about biology.

[By the studio that brought you and !]

Raymond was the illegitimate son of the king.

After being shamed and scorned, he ran away and became a healer… only to end up being ridiculed for getting an F rank.

Then, one day, a miracle came upon him.

[You have awakened as a player!]

[Job: Surgeon (SSS-rank)]

Raymond gained medical knowledge that had not existed in this world. The great legend of Raymond, the first surgeon, begins now!

Doctor K is a doctor with exceptional skill. Graduated from a top-tier, high profile medical college, instead of working in a hospital or running his own clinic, he prefers to live his life wandering around to treat people in needs of help.

It is about a young, prominent surgeon, who left a prestigious hospital in Tokyo and moved to an isolated island in the southern part of Japan. He works at a clinic there as the only doctor on the island. First the islanders didn't trust him but slowly he gains their respect.

In 2004 Dr. Koto Shinryoujo won the Shogakukan Manga Award for general manga.

Spin-off "Cells at Work" (Hataraku Saibou) on the activity of leukocytes.

Misuzu, a female college student who loves herbs, noticed one day in a lush forest. What a different world where magical power and monsters exist! It was the hunter Alex who helped her when she was about to be attacked by a monster. Misuzu offers to treat his injury in gratitude. When a compress is applied using herbs, his arm, which had been stuck due to a curse, immediately moves …!? A reincarnation fantasy that heals a different world with the magic of herbs given by the goddess, the long-awaited comicalization!

A spin-off of Hataraku Saibou that focuses on the idle daily lives of erythroblasts (immature red blood cells) who don't want to work.

New York, 1920s. On the day of his execution, David Douglas, a prisoner on death row, meets Victoria Frankenstein, a 13-year-old medical genius. This encounter was the beginning of a life after death...

Kim Jihyun, who lived his life as a disreputable surgeon, gains a second chance to relive his life. He then goes back to his middle school days, and live his life to the fullest unlike before, he studies nonstop. His goal is to become a dermatologist who make lots of money instead of the poor surgeon he was from previous life!

From Etc:
Dr. Katou is an ambitious woman who seeks to revolutionize the corrupt and inefficient Japanese medical system from within by becoming a professor in a teaching hospital. She enlists a maverick surgeon, Dr. Asada Ryuutarou, to help her with research that would catapult her to a professorship should they succeed and publish. However, Asada's refusal to conform to the system soon threatens to destroy not only her plans but her entire career. Katou is prepared to do anything, including going along with the system, in order to achieve her end goal, but she begins to question whether she has gone too far as Asada's actions bring many of the system's shortcomings to light.

Note: Won the 50th Shogakukan Manga Award for general manga in 2005.

"Are you in need of drugs effective against villains?" Poisons, aphrodisiacs, wonder drugs, anything. Shin, a mysterious pharmacist whose origin is unknown to everyone, is creating miracles today too with the deluxe medicine he creates.

Genius Doctor Si Kong Jiu Ye was transmigrated into a mysterious place. She was harassed by the narcissistic prince, and offended the icy cold prince, and the medicine crazy guy fall in love with her.
What would be the outcome of the story?

Happiness is simple. You and me.

Werewolves, vampires, dragons, and all sorts of other mythological beings are real, and they live hidden among us. But in order to stay hidden, they need special doctors who can treat them without having to worry about their true natures being revealed. Toketsu Tatsumaki is one such doctor, a young yet brilliant human boy who has genetically altered his own body to better be of service to the supernatural community.Winner of Weekly Shonen Jump's 2015 Golden Future Cup.

Hito Natsu no Kids Game (ひと夏のKIDSゲーム Hito Natsu no KIDS Gēmu) is a short, debut manga work by Ken Akamatsu, the creator of Love Hina. The manga was published on September issue of Kodansha’s Magazine Fresh on September 10, 1993. Ken Akamatsu later received Kodansha’s "Freshman Manga Award" (Japanese: 新人漫画賞/少年マガジン新人賞) and Special Jury Award (Japanese: 審査員特別賞) for this work.The manga was re-published on 20 May 2001.

(Description taken from Wikipedia)