I have an individual plan. The reimbursement was paid to me in the form of a check (separate from regular paycheck) for the exact premium amount, that I deposited into my bank account and used to pay the premium directly to my provider.
If an employee pays the premiums on personally owned health insurance or incurs medical costs and is reimbursed by the employer, the reimbursement generally is excluded from the employee’s gross income and not taxed under both federal and state tax law. This includes premiums for tax dependents and opposite-sex spouses. However, there are some circumstances in which the reimbursement is taxable income, including the following:
http://healthcoverageguide.org/reference-guide/laws-and-rights/tax-implications/