US National Provider Identifier (NPI) Regex for Go

What this pattern does

This page provides a lightweight, single-purpose regular expression for matching us national provider identifier (npi), ported and verified for Go. 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 Go project — whether you're validating in a Gin handler, a gRPC service, or a command-line tool.

Go Implementation

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

package validation

import "regexp"

var usNationalProviderIdentifierNpiRe = regexp.MustCompile(`^[0-9]{10}$`)

func ValidateUsNationalProviderIdentifierNpi(s string) bool {
    return usNationalProviderIdentifierNpiRe.MatchString(s)
}

// Example
// fmt.Println(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 Go developers because Go's RE2 engine is inherently safe from catastrophic backtracking, but this pattern has been additionally verified for correctness. 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.