The Administrator can not require that the services be rendered by a particular health care services provider. (insubuy.com)
... each Individual is already unimpeded from seeking voluntary cooperation from health care service providers; if I may take a «softened» stance for a moment, what I believe those professing a «human right to health care» likely have at issue is that some people wish to contract services with no means of consideration for contracts required to obtain those services peacably. (politics.stackexchange.com)
June 2011 - «Canada Revenue Agency provides list of exempt and taxable health care service providers», Tax Bulletin (lexsage.com)