Kaiser said that the two people injured in the fire were employees.
Firefighters say that the fire was contained as of 8:27 a.m. Tuesday. No medical offices have been impacted by the fire.
The cause of the fire is under investigation.
Kaiser released the following statement:
"Our thoughts are with our two employees who were injured in this morning's electrical fire in the basement of the 2238 Geary St. garage, and with their families. We are very grateful to our medical staff who provided immediate assistance on the scene. Our medical offices are open and fully operational and we are cooperating with the San Francisco Fire Department as they examine the cause of the fire."