D.C. Code § 47-1379

The Superior Court shall not open a judgment rendered in an action for foreclosure of the right of redemption, except on the grounds of lack of jurisdiction or fraud in the conduct of the action to foreclose; provided, that the reopening of a judgment on the ground of constructive fraud in the conduct of the action to foreclose shall not be entertained by the court unless an application to reopen a judgment rendered is filed within 90 days from the date of the judgment.