In Starfield, doctors are the easiest way for players to heal their status effects or purchase more aid items. Just about every major city in the galaxy has a doctor, but without a detailed city map, they can be difficult to find.
Starfield: Where To Find The Doctor In New Atlantis
New Atlantis is the first major city players will find in Starfield with two doctors to visit should they need to be healed or buy Aid items.
