the amount of any payment (including any amount paid by an employer for insurance or annuities, or into a fund, to provide for any such payment) made to, or on behalf of, an employee or any of his dependents under a plan or system established by an employer which makes provision for his employees generally (or for his employees generally and their dependents) or for a class or classes of his employees (or for a class or classes of his employees and their dependents), on account of—

(A) sickness or accident disability (but, in the case of payments made to an employee or any of his dependents, this subparagraph shall exclude from the term “wages” only payments which are received under a workmen’s compensation law), or

(B) medical or hospitalization expenses in connection with sickness or accident disability, or

(C) death;