The Bikini Bottom Hospital is the main hospital in Bikini Bottom that appears throughout the series. It is first mentioned in "Boating School" and makes its first physical appearance in "Suds."
The exterior of the hospital, unlike its interior, has not changed much if at all. The exterior contains an arch, designed to appear as one-half of a lifesaver, with the word "Emergency" written on it. The main makeup of the building is basically a wooden cube. Expenditures, such as windows and blue building-like extensions, are present throughout the exterior of the building.
The interior of the hospital has changed extensively throughout its appearances in the series. In its debut appearance, it only features one large chrome doctor's room, belonging to Purple Doctorfish. Throughout the series' continuity, many rooms have been added, such as a waiting room, several hallways, large medical rooms, and other rooms.
It appears at the end of the episode. SpongeBob is treated for his suds here. Patrick is also given a cruel and unusual treatment known as the "starfish treatment," which serves as a comeuppance for impersonating a doctor.
It appears when Mr. Krabs is released after getting his arms pulled off when he tries to retrieve a coin from the sink. The Purple Doctorfish tells Mr. Krabs to come back if there are any troubles. Squidward runs past with only a cloud of bubbles covering his private areas. He is running to the Krusty Krab to check up on SpongeBob. As a result, Mr. Krabs' arms fall off again and he runs back into the hospital.
SpongeBob slips on an ice cube when he tries to enter The Salty Spitoon, injuring him in the process. He is then rushed to the Bikini Bottom Hospital. Because SpongeBob phrased his injury as "boo-boos," the Purple Doctorfish suggests that he go to Weenie Hut General.
Mr. Krabs eats a rotten patty and ends up in the hospital as a result.
After recovering from his illness, he asks the doctor if he is going to be okay, though the Purple Doctorfish is interrupted by the Flying Dutchman's sudden appearance.
Mr. Krabs lies about being Eugene Krabs. The Flying Dutchman believes him and tries to confirm this claim with the front desk. The Dutchman then returns after the receptionist says that Mr. Krabs' room is Eugene Krabs' room. The Flying Dutchman wants Mr. Krabs to go to Davy Jones' locker as Mr. Krabs pleads to the Dutchman to allow him to live.
The Flying Dutchman allows Mr. Krabs to live if he stops being greedy.
After a sandboarding accident on Sand Mountain, SpongeBob drastically injures his buttock bones and is sent to the hospital. The Purple Doctorfish tells him that they had to staple and eventually glue his butt back together. The Purple Doctorfish warns SpongeBob that if he fractures his buttocks once more, he will have to be permanently treated by the Iron Butt, a machine that is similar to the iron lung but for buttocks.
This is one of the main locations of the episode. After SpongeBob and Patrick replace Mr. Krabs' old mattress, Mr. Krabs goes into a money coma because his money was inside his old mattress. He ends up in the hospital as a result.
Dr. Actor tells SpongeBob, Squidward, and Patrick that the only way to get him out of the coma is to return his old mattress to him. Squidward tries to explain that it was all SpongeBob and Patrick's idea. However, Officer John Slugfish tells Squidward that since he wrote that it was all his idea in the card that SpongeBob and Patrick made, Squidward also has to help because if he does not he will go to jail. They go to The Dump and attempt to get it back from a guard worm.
Meanwhile, Dr. Actor tells the nurse that Mr. Krabs cannot afford a room. The nurse puts Mr. Krabs, who is on a stretcher, in the hall. Later, Dr. Sileen tells Dr. Actor that Mr. Krabs is blocking a vending machine. The nurse moves the stretcher outside.
Later, Administrator Flotsam tells Dr. Actor that he cannot have a patient outside.
The nurse then pushes him down a hill, which leads him to the dump, where he smells the money in the mattress and thus recovers from his coma.
After Squidward breaks his laugh box, he ends up in the hospital. SpongeBob, Patrick, Mr. Krabs, and Sandy visit Squidward. Patrick explains that they took out his laugh box. Dr. Actor explains that SpongeBob gave Squidward half of his, essentially making Squidward's laugh resemble that of SpongeBob.
After an attempt to run a hotel fails, Mr. Krabs, SpongeBob, Squidward, and Patrick end up in the hospital. After receiving the bill, Mr. Krabs tells the others that they will be going to medical school, so he can run a hospital.
After SpongeBob accidentally slams the door in Squidward's face, he ends up in the hospital for cosmetic surgery. SpongeBob waits in the waiting room for Squidward to recover; the purple doctor comes into the waiting room and tells SpongeBob to come back in two weeks.
Two weeks later, he visits the hospital again with a bouquet of flowers. He visits Mable and gives her a flower. He then visits Squidward. The Purple Doctorfish then tells SpongeBob that he cannot be anywhere near Squidward during the revelation of Squidward's new face.
When the doctorfish finally takes off the bandages, he faints because of how handsome Squidward is. He also makes Sadie, who is a nurse, faint. Squidward requests a mirror and then sees himself in the mirror, admiring himself in the process.
Squidward gets carried away with using a slide whistle to seek attention. Eventually, he hijacks a truck and ends up falling off a cliff. He is subsequently sent to the hospital.
The Purple Doctorfish says that thanks to the slide whistle getting lodged in Squidward's throat people were able to rescue him. However, with the current technology of the hospital, they cannot surgically remove it. SpongeBob and Patrick then have fun around the hospital with their own slide whistles.
After SpongeBob, Patrick and Larry slam into Ripper's Reef at full force, and all are impaled with the rocks, they end up in the hospital. Patrick and Larry are put in full body casts, while SpongeBob is put in a wheel chair.
Mermaid Man and Barnacle Boy end up in the hospital because of SpongeBob and Patrick's usage of the Mermarang. Barnacle Boy gets a call on his shellphone from the police commissioner. He tells Barnacle Boy that they need to go to a shuffle-boarding competition. However, they are unable to attend in their condition. SpongeBob and Patrick say that they are certified Mermaid Man and Barnacle Boy impersonators. With no other options, Barnacle Boy gives them two rings that, when put together, allow them to have Mermaid Man and Barnacle Boy costumes.
Later, after SpongeBob and Patrick have made the citizens of Bikini Bottom angry by impersonating them, SpongeBob and Patrick visit Mermaid Man and Barnacle Boy in the hospital to give them the trophies. Mermaid Man and Barnacle Boy take back the costumes and are then released to find an angry mob rioting against them.
After Mr. Krabs uses Gary's power to conduct money, he ends up collapsing by a title wave of money at an arcade and thus ends up in the hospital. It is revealed that Gary's powers came from a Mermaid Man and Barnacle Boy magnet that he swallowed. Mr. Krabs gets the bill but says that he cannot pay it. The Purple Doctorfish says that Mr. Krabs has enough money in coins to pay the bill.
This is one of the main locations of the episode. Plankton impersonates Gary to enter the Krusty Krab because it is a special day where SpongeBob can take Gary to work. However, things go awry when SpongeBob notices that there is something off about "Gary," so he takes "Gary" to the hospital.
After SpongeBob accidentally breaks Mrs. Puff's puffing gland, she is sent to the hospital. Here, she learns that the hospital does demolition derbies with patients. This gives her the idea to try and kill SpongeBob in a demolition derby.
Squidward gets disturbed by SpongeBob and Patrick behaving noisily. He accidentally slips on one of their toys, causing him to land in a movable playpen. His momentum from slipping makes him hit his head on SpongeBob's mailbox. His head enlarges and he starts babbling.
At the hospital, the Purple Doctorfish tells SpongeBob and Patrick that Squidward has a condition that makes him act like a baby. It was caused by Squidward hitting the mailbox. He explains that it should wear off if they don't keep hitting his head.
"The String" - The hospital was presumably destroyed when SpongeBob unraveled all of Bikini Bottom and the Milky Way with the string.
Gary and Karen have never been to this hospital. However, in "Shellback Shenanigans," they are both mistaken for things in the hospital. SpongeBob believes that Plankton is Gary and takes him to the hospital, and Plankton believes that one of the heart monitors in the hospital is Karen.