Tredegar Medical Aid Society was founded in Tredegar in South Wales. In return for a contribution from its members it supplied free health care. This society contributed the model which established the British National Health Service.
In 1890, a merger of various local societies in Tredegar allowed the Tredegar Workmen's Medical Aid and Sick Relief Fund to be formed. This merger included a large number benevolent societies including one society which provided medical benefits and funeral expenses to its 3,000 members. This foundation enabled the society to grow in its ambitions.
The local Cottage Hospital was established in 1904 following a proposal made at the society in 1901. The hospital's land had been funded by Lord Tredegar after a separate committee of thirty had been formed to organise the hospital's establishment. The cost of the building's construction came from the Tredegar Iron and Coal Company and other local philanthropists, whilst the running of the hospital was underwritten by the ironworkers. Each worker agreed to contribute a halfpenny per week and in 1909 this was increased to a penny per week.
By June 1911 the society was well regarded nationally. A delegation which included Sir Arthur Markham Bt. and T. Richards MP conceded that "the Tredegar Workmen's Medical Aid and Sick Relief Fund was far in advance and more beneficial in respect to its members than any of the other societies." The visit had been organised because of the 1911 Invalidity Bill which increased the rights of workers in the event of them being unable to work. The Tredegar society made large changes that year as the new legislation meant they needed to stop giving sick pay of two shillings per week. The society converted itself into a benevolent society but substantially kept its aims. It was now able to claim money from the Government to supplement the work it had previously done using its members' contributions.
In the same year the society employed Dr ETH Davies as their lead medic and the society became the Tredegar Workmen's Medical Aid Society. Dr Davies was to be a key part of the society for the next 38 years. He was said to be the most qualified medical person in Wales when he won a ballot for his appointment. Dr Davies won due to grassroots support when he achieved 2,584 votes whilst there were 1,804 votes for his competitor.