What the title says. List all the yaoi you know with doctors in them.
Preferably as one or both of the main characters.

Just off the top of my head:

Lovely Sick
COLD - Zettaireido no Koibitotachi
Junjou Romantica (Egoist arc)
Koi no Tsubo (historical, though.)
Jazz
Specter (...but not part of the couple.)
Zion no Koeda (...though it's hardly the focus.)

Innaikansen
Hakui no Shihaisha

They are terrible IMO. But you might like. 😮

Chitose Piyoko has a couple involving doctors. Not sure which ones.

Shitsuren Mania
Ore wa Koi no Haousama
Aruhi Totsuzen Koi wa Kuru?! Chap 4 only.
Tsukiyono Fushigi Chap 5 only.
Hachimitsu Darling
Nurse ga Oshigoto Chap 2.
Bi no Isu Chap 4 only.
Senaka Kara Daite Chap 1.
Egoism (AGAWA Kouko)
First Love
Shihaisuru Yubisaki and its sequel Kogareru Yubisaki
Rumble Rush Chap 2.
Finger Stinger

I don't know if you consider infirmary senseis as doctors, but here are some anyway:
Hatsukoi Monogatari (FUKAI Youki)
Shiroi Ori
Boku no Kichiku Megane
Sono Kuchibiru ni Ai wo
Inu Catalog
Kimi ni Sasayaku Mirai

Allure

The Secret of Fuyuki - doctor from a local clinic.
Kage Aru Tokoro ni - pediatric surgeon? :3
Hanataba ni Te wo Agero! ch 1-2
Mumyoutou - Historical.
Innaikansen :]
Tenshi no Uta
Kiraboshi Dial