BlueCross BlueShield officials estimated that a false fire alarm in which the Cameron Hill campus was evacuated cost the company $251,000.
Nicole Denise Coleman, a 34-year-old BlueCross intern, admitted to pulling a fire alarm, police said.
She was arrested on Monday on charges of reckless endangerment and making a false report in the incident last Sept. 22.
Several thousand employees of the insuror had to evacuate just before 4 p.m.
The cost figure was based on lost time from work and several injury claims as a result of the evacuation.