Public-Private Employee Retirement Parity Act - Excludes as creditable service under the Federal Employees' Retirement System any service performed by an employee or Member of Congress (including military service) performed after December 31, 2012, if that individual did not perform any period of creditable service (including military service) before January 1, 2013. Prohibits an employing agency from making any deduction or withholding from the basic pay of any employee or Member for such excluded service.