That figure is part of a damage estimate in legal papers filed by Stow's attorneys.
Stow and his children have filed suit against Dodgers owner Frank McCourt and others. The suit alleges a lack of security, lighting and other problems at the ballpark.
Stow suffered a traumatic brain injury. Stow's health has been up and down in the months since the near-fatal beating. His doctor said it's unclear how long the recovery will take.
Two men who are charged in the attack have pleaded not guilty.
The Associated Press contributed to this report.