The basics are covered visits to the doctor,medicines, treatments - although adults are required to pay a nominal co-pay fee for some items and services.
VOA: standard.2009.09.28
To state this was the first income tax is not only absurd but ludicrous, unless the author contends that employers who deduct from their employees payitems required as a term of employment such as meals, uniforms etc. is somehow a form of income tax levied by the government to compensate the employer for such expenses.