The UK has a largely state-run healthcare system called the National Health Service (NHS). The NHS provides universal coverage to all citizens and is funded primarily through taxes. It consists of four independently operated public healthcare systems, one each for England, Scotland, Wales, and Northern Ireland. Primary care is accessed through general practitioners (GPs) and includes services like dentists and opticians. Secondary and tertiary care requires referral by GPs and includes specialized services delivered through hospitals, which are organized into trusts. While mostly public, the UK system also includes some private healthcare options.