Walker General Hospital was a large hospital in San Francisco. In 1999, Grace Holloway worked there as a cardiologist. The Seventh Doctor was brought there after being shot by a criminal gang. After the Doctor died under anaesthesia and his body disappeared from the morgue, hospital administrator Swift covered up the incident, prompting Grace to quit. (TV: Doctor Who)
The hospital was particularly significant to the Doctor, as its morgue was the location of his regeneration into his eighth self. The event was apparently traumatic enough that it made the Doctor thereafter uncomfortable in hospitals. (PROSE: Legacy of the Daleks, Kursaal; TV: New Earth)
Behind the scenes
On-screen, the name of the hospital is not given in any dialogue, and can only be seen clearly on the toe tag the Doctor wears throughout his regeneration cycle; no other name tags, signage, or other graphics clearly reveal it. The printed script and the novelisation confirm that this is the hospital's name.