Employees' State Insurance (Central) Rules, 1950
61. Medical benefits to retired insured persons
An insured person who leaves the insurable employment on attaining the age of superannuation after being insured for not less than five years, shall be eligible to receive medical benefits for himself and his spouse at the scale prescribed under the Act and the regulations made thereunder, subject to-
(i) the production of proof of his superannuation and having been in the insurable employment for a minimum of five years to the satisfaction of such officer as may be authorized by the Corporation; and
(ii) the payment of contribution at the rate of ten rupees per month in lump sum for one year at a time in advance to the concerned office of the Corporation in the manner prescribed by it.