NEW ZEALAND HEALTH INFORMATION SERVICE
National Health Index
The National Health Index number (NHI number) is a unique identifier that is assigned to every person who uses health and disability support services in New Zealand. A person’s NHI number is stored on the National Health Index (NHI) along with that person’s demographic details. The NHI and associated NHI numbers are used to help with the planning, co-ordination and provision of health and disability support services across New Zealand.
The NHI is associated with the Medical Warnings System (MWS), which is designed to warn healthcare providers of any known risk factors that may be important when making clinical decisions about individual patient care.
The following links provide more information about the NHI and MWS.
- Fact Sheet
- Leaflet about the NHI (with translations into 10 languages)
- Frequently Asked Questions
- Finding out the information about you in the NHI
- Statement of Use
- Stories and articles about the NHI
- NHI Upgrade Programme
- NHI training package
- Information for users of the NHI (for health and disability support services)
- Go to the login page for NHI Online (new users, please read the instructions below to gain access)
To gain access to the NHI and MWS, you will need do the following:
- First, obtain a digital certificate for authentication.
- Second, register for access to the NHI/MWS database (note that this link will not function unless you have a digital certificate installed).

