Function: npi()

npi(rng): string

A synthetic NPI - a 10-digit National Provider Identifier with a deliberately-invalid Luhn check digit, so it can never be a NPPES-issued NPI (a real NPI must satisfy the 80840-prefixed Luhn check). The 9-digit base is drawn from the seeded generator; the check digit is set to (correct + 1) mod 10, guaranteeing the full value fails validation.

Parameters

rng

Rng

The seeded generator.

Returns

string

A 10-digit NPI-shaped string that is provably not a real NPI.

Example

import { createRng, npi, isSyntheticNpi } from "@cosyte/synth";
isSyntheticNpi(npi(createRng(1))); // true - invalid check digit by construction