US National Provider Identifier (NPI) Regex for JavaScript

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching us national provider identifier (npi), ported and verified for JavaScript. Identity and credential patterns need both correctness and safety, since they're frequent targets for adversarial input. The snippet below is ready to drop into your JavaScript project — whether you're validating in an Express middleware, a Next.js API route, or a client-side form.

Javascript Implementation

// US National Provider Identifier (NPI)
// ReDoS-safe | RegexVault — Identity & PII > Health Identifiers

const usNationalProviderIdentifierNpiRegex = /^[0-9]{10}$/;

function validateUsNationalProviderIdentifierNpi(input: string): boolean {
  return usNationalProviderIdentifierNpiRegex.test(input);
}

// Example
console.log(validateUsNationalProviderIdentifierNpi("1234567893")); // true

Test Cases

When to use this pattern

This pattern is drawn from the Identity & PII > Health Identifiers category and carries a ReDoS-safe certification. That matters for JavaScript developers because especially critical in long-running Node.js event loops where a ReDoS vulnerability can block the entire process. RegexVault audits patterns against known backtracking attack vectors, ensuring you have the necessary context before using this regex in a high-stakes production environment.

Common Pitfalls

Technical Notes

NPI is the US healthcare provider identifier under HIPAA. Issued by CMS (Centers for Medicare and Medicaid Services). The last digit is a Luhn check digit (applying the Luhn algorithm with prefix 80840 prepended to the 9-digit base). Type 1 NPI = individual, Type 2 = organization.