New Zealand NHI Number Validator
Online National Health Index (NHI) validator for New Zealand with HISO 10046 alphabet checks and Modulo 11 verification.
New Zealand NHI Verification
Validates strict compliance with Te Whatu Ora HISO 10046 healthcare identification standards.
Essential for clinical software development and integration tests.
NHI Number Anatomy & Structure
New Zealand clinical identifier in AAANNNN format:
| Position | Field | Length | Meaning & Specification | Example |
|---|---|---|---|---|
| 1 to 3 | Letter Series | 3 letters | Uppercase letters excluding I and O | ABC |
| 4 to 6 | Numeric Series | 3 digits | Patient base digits | 123 |
| 7 | Check Digit | 1 digit | Weighted Modulo 11 check digit | 4 |
Validation Algorithm (HISO 10046)
Verification of official Modulo 11 checksum:
Decreasing weights [7, 6, 5, 4, 3, 2] applied to first 6 characters.
- 1. Ensure the first 3 letters do not include I or O.
- 2. Apply weights [7, 6, 5, 4, 3, 2].
- 3. Confirm that calculated check digit matches the 7th character.