The Accident Compensation Corporation says it won't review a staff card which can be used for visits to day-spas and treatments such as manicures and botox.
The National Party says the Activa scheme costs the ACC $750,000. It also offers access to pet care and funeral services.
Despite National's concerns, ACC says the scheme won't be reviewed.
It says the Activa card costs ACC only 0.1% of its overall salary bill.
ACC says the benefits are increased productivity, fewer sick days and better staff retention.