Doc Church is the physician in charge, and the Lone Wanderer can purchase medical supplies, have their wounds healed or even have radiation contamination removed. There is a holotape about the Replicated Man on the desk in the back (which one can talk to the doc about) and the clinic medical supplies (only accessible if the player character kills Doc and steals the key). There is a room opposite the entrance which may be empty or housing up to three unconscious patients.
There is a holotape on top of Doc Church's desk to the left of the broken computer terminal entitled Wanted: Trustworthy Surgeon. This holotape can activate The Replicated Man quest.
The Megaton clinic appears only in Fallout 3.