NHS Status Checker

Validate UK NHS numbers instantly using the official checksum algorithm

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< 15ms

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About This Tool

The Online NHS Checker is a free tool that validates UK National Health Service (NHS) numbers according to the official NHS algorithm. NHS numbers are 10-digit identifiers used in the UK healthcare system, with the last digit being a checksum for validation. This tool allows you to quickly check if an NHS number is valid by verifying its format, digit structure, and checksum calculation. Simply enter any NHS number to get instant validation results with detailed information about the number's structure and validity status.

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How to Use

Enter a 10-digit NHS number in the input field (with or without spaces)
Click the 'Validate NHS Number' button
View the validation results showing whether the number is valid
If invalid, see detailed error information about what's wrong with the number
Use the 'Clear' button to reset the form and check another number

Frequently Asked Questions

Find Quick Answers

What is an NHS number?

An NHS number is a unique 10-digit identifier assigned to everyone registered with the UK National Health Service. It's used for healthcare records and services across England, Wales, and the Isle of Man.

What format should NHS numbers have?

Valid NHS numbers are 10 digits long. They are often displayed with spaces (e.g., 485 777 3456) but the tool accepts both spaced and unspaced formats. The last digit is a checksum calculated from the first 9 digits.

How does the validation work?

The tool checks: 1) The number has exactly 10 digits, 2) All characters are numeric, 3) The checksum digit matches the calculated value using the official NHS algorithm (multiplying each digit by 11-position and checking modulo 11).

Is this tool storing or sharing the NHS numbers I enter?

No. All validation happens locally in your browser. No data is sent to any server or stored anywhere. The tool works entirely client-side for complete privacy.

What does the validation result show?

The result shows whether the NHS number is valid or invalid. For valid numbers, it displays the formatted number. For invalid numbers, it provides specific error details like incorrect length, non-numeric characters, or checksum mismatch.

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