NHI

A function to check strings against the New Zealand Ministry of Health NHI Validation Routine. Supports the old and new NHI number formats specified in HISO 10046:2025.

Install

pip install python-nhi

For the other versions of this library, see:

• nhi on Hex (Elixir)
• nhi on JSR (JavaScript)
• nhi on Crates (Rust)
• nhi with Pkl

Usage

New format NHI values:

from nhi import is_nhi

is_nhi("ABC12DS")  # True
is_nhi("ABC12D0")  # False

Old format NHI values:

from nhi import is_nhi

is_nhi("AAA1116")  # True
is_nhi("AAA1110")  # False

By default, test NHI values (starting with 'Z') are rejected:

from nhi import is_nhi

is_nhi("ZZZ00AC")  # False

Test values can be allowed with the allow_test_values flag:

from nhi import is_nhi

is_nhi("ZZZ00AC", allow_test_values=True)  # True

See Also

• https://www.tewhatuora.govt.nz/publications/hiso-100462025-consumer-health-identity-standard/