Star Surgeon

It's kind of dated, All the characters are men.
It's kind of a weird projection into the future that doctors would be color coded.
It was awkward every time they mentioned Black Doctor Tanner.
It seems that I recall a few other SF stories from the 1950s and early 1960s where capes are a fashion thing.

To join the Galactic Federation,a planet has to have something to contribute to the Federation and what Earth has to offer is probably not realistic but unexpected and interesting.
The motive for Tanner hating our hero is believable but petty.

And the solution to the Brucker aliens medical problem was clever and a big surprise.