"Notice 2015-87 reaffirms that HRAs limited to retirees may reimburse individual market insurance premiums (including Medicare supplement plans) and other medical-related costs.... Unless the retiree-only exception applies, unused amounts in an HRA cannot be used to reimburse premiums paid by former employees for individual market coverage even if the amounts were originally earned in the HRA when the HRA was properly integrated with a group health plan.... An HRA that reimburses medical expenses for an employee and the employee's spouse and dependents cannot be integrated with self-only group health plan coverage provided by the employer. However, the IRS will not enforce this requirement until 2017."