Administrative Law Judge Katherine Morgan, one of seven judges in the Office of Disability Adjudication and Review in Portland, said in the lawsuit filed Thursday in U.S. District Court in Portland that she was targeted by the office’s chief judge because of her age. She is 71.

Morgan, who has been a judge since 1994, filed a written complaint to her immediate supervisor, Chief Judge Guy Fletcher, after she was told on Dec. 11, 2013, that she was being targeted in an investigation by the Social Security Administration for her performance. The investigation focused on Morgan’s high production rate in deciding cases, for approving a high number of appeals and for attendance issues, according to the lawsuit.

The Portland Press Herald reported that Judge Morgan’s recent hearing statistics.  In the most recent fiscal year, Maine judges approved 53 percent of disability claim appeals, dismissed 24 percent of claims and denied 23 percent, according to the website’s statistics.

Morgan approved more appeals than any other judge in the Portland office. She approved 65 percent of disability claim appeals, dismissed 20 percent and denied 15 percent. She decided 148 cases from last Oct. 1 to March 11.