Mrs. Tanner (Kathryn Joosten)
An old lady who refused to undergo dialysis because she decided she had lived a long and eventful life and wanted to die peacefully.
Jill Tracy (Nicole Sullivan)
A recurring patient of the Sacred Hospital. J.D. and Cox found her rather annoying. She's one of the most recurring patients of the series.
- Armor-Piercing Question: "How have things been going lately?", which prompts her to admit she tried to kill herself.
- Ascended Extra: She appeared in a Season 1 episode, then returned for a few more episodes and then died in her second last appearance.
- Back for the Finale: She appeared in J.D's second last fantasy of him walking down the hallway to the exit of Sacred Heart.
- Driven to Suicide: A failed attempt in "My 15 Seconds", although J.D. and Cox manage to figure it out and try to help her. It's uncertain if it was her cocaine overdose or the rabies that killed her in "My Lunch", but J.D. was wrought with guilt thinking he could have helped her.
- Our Ghosts Are Different: After her death, she haunts Cox. It's comparable to how Laverne does this to Carla as she's dying.
- I Just Want to Be Loved: She's really lonely and once attempted suicide because her life went to hell.
- Motor Mouth: She can talk really fast and she says more words in one scene then most of the main cast say in half an episode.
- Stepford Smiler: Even though she's going through a rough period, she puts up a smiling façade.
- Unwitting Instigator of Doom: She had rabies when she died, which may have been what killed her, but everyone assumed that she committed suicide due to depression and since she was a donor and they had several patients waiting, her organs were transplanted before her disease was discovered, which meant that Dr Cox accidentally killed three of his own patients.
Ben Sullivan (Brendan Fraser)
Ben Sullivan is Jordan's little brother, and close friend to Dr. Cox. Infamous for taking photographs all of the time. Ends up in Sacred Heart as a patient suffering from leukemia. Played by Brendan Fraser.
- Anyone Can Die: Ben dies from complications due to his leukemia.
- BrotherSister Incest: Though he was probably just messing with JD. Probably.Ben: So, I understand you have slept with both of my sisters, which means we have something in common.
- Camera Fiend: Ben's hobby is taking pictures of people when they aren't expecting it because they're more real to him then taking still pictures of people smiling.
- Dead All Along: At the end of "My Screw Up", it's revealed that Ben is the patient that went into cardiac arrest and died, and all appearances subsequent to J.D. delivering this news were the hallucinations of Dr. Cox.
- Fun Personified: He's rarely ever serious and all about having a fun time taking pictures and being fun.
- Heterosexual Life-Partners: With Dr. Cox of all people.
- The Klutz: Informed Attribute. He first shows up with an Impaled Palm due a nailgun, and Jordan states he's too accident prone for construction work.Jordan: How many times have you hurt yourself with that nail gun?
Ben: Once. (Off her "Oh, really?" look) What? That nail gun, it's a new nail gun. Any other nail gun, the estimate would be slightly higher.
- Manchild: Has a childish and carefree attitude, but oddly enough this doesn't seem to annoy Dr. Cox.
- Nice Guy: Eccentricities aside, he's an incredibly nice guy who outside of Jordan (And even then it's due to exasperation at his antics), everyone likes. When he died, everyone showed up for his funeral.
- He's so nice that Dr. Cox's hallucination of him forces him to apologize to J.D. and to forgive himself before the funeral.
- Odd Friendship: Ben is friendly, charming, and has a goofy sense of humour. Dr. Cox is moody, surly and misanthropic. They are still very close friends and Cox is devastated when Ben dies.
- Token Good Teammate: Compared to both his sisters (Jordan and Danni) and his brother-in-law (Dr. Cox), he seems to be the only likable person in the family. We don't know much about his parents but in one episode Cox claims that Jordan is basically the same as her mother.
- Wham Line: The subject of two very powerful ones.Ben: Come on JD. We both know that none of this is real. note
JD: Where do you think we are? note
- And in his final appearance;
Harvey Corman (Richard Kind)
A patient that appeared in four episodes. He's a hypochondriac who constantly bothers doctors and insists that he has some sort of illness. He's an excellent tennis player as well.
- Hypochondria: His most defining trait. He will constantly insist he has some sort of disease, no matter how obscure. It annoys Dr. Cox to no end in a couple of episodes.
- Jerkass: He harassed Turk and then sued him over his surgery in Season 4, plus his hypochondria often made him a pain in the ass for anyone caring for him.
- Stalker Without a Crush: He once thought Turk's surgery on his arm affected his tennis game and Harvey kept bothering him about it. Turk had to end up getting a restraining order on him.
- Weak, but Skilled: He's not very athletic and his hypochondria holds him back, but his tennis swing was strong enough to send Dr. Cox flying into the fence behind him.
Mike Davis (Michael McDonald)
A semi recurring patient who appeared three times in the early seasons. Mike has a habit of being unable to hold his tongue, which gets him injured enough to be in the hospital.
- Back for the Finale: He appears in J.D.'s last fantasy in My Finale, claiming he broke his penis. For once, it wasn't because he insulted someone; he claimed it was for fun.
- Brutal Honesty: Arguably a deconstruction, since it gets him in a lot of trouble.
- Deadpan Snarker: A very harsh example and he gets harsh injuries as a result.JD: You broke your penis.
Mike: Great. I can't wait to get my cast signed.
- Jerkass: He's really rude to the doctors looking after him.
- Too Dumb to Live: He never shuts up when he really needs to and it gets him in a lot of trouble with people.