Medicare Generator - Complete Guide

Medicare number generator creates valid test Medicare card numbers for Australian healthcare system testing. Medicare numbers use a specific format with check digit validation. For software testing only - not for actual healthcare use.

How It Works

Generate 8-digit base number plus check digit using weighted sum algorithm. Medicare format: 10 digits displayed as XXXX XXXXX X. IRN (Individual Reference Number) 1-9 appended for family members.

Technical Details

Medicare format: 10 digits (8 base + 1 check + 1 IRN). Check digit: weighted sum with weights [1,3,7,9,1,3,7,9], mod 10. IRN: 1-9 for card members. Cards valid 1-5 years. Green (resident), Blue (interim), Yellow (reciprocal).

Common Use Cases

1. Healthcare Software: Test patient management systems.
2. Form Validation: Verify Medicare input validation.
3. Integration Testing: Test Medicare claiming integrations.
4. Database Testing: Seed test databases with valid numbers.

Code Examples

Medicare Number Generator

// Medicare check digit weights
const MEDICARE_WEIGHTS = [1, 3, 7, 9, 1, 3, 7, 9];

// Calculate Medicare check digit
function calculateMedicareCheckDigit(digits) {
  if (digits.length !== 8) throw new Error('Need 8 digits');

  const sum = digits.reduce((acc, digit, i) => {
    return acc + (digit * MEDICARE_WEIGHTS[i]);
  }, 0);

  return sum % 10;
}

// Validate Medicare number
function validateMedicare(medicare) {
  const digits = String(medicare).replace(/\s/g, '').split('').map(Number);

  if (digits.length !== 10 || digits.some(isNaN)) {
    return false;
  }

  // Check digit is position 9 (index 8)
  const baseDigits = digits.slice(0, 8);
  const checkDigit = calculateMedicareCheckDigit(baseDigits);
  const irn = digits[9];

  return checkDigit === digits[8] && irn >= 1 && irn <= 9;
}

// Generate valid Medicare number
function generateMedicare(irn = 1) {
  if (irn < 1 || irn > 9) irn = 1;

  // Generate 8 random digits (first digit 2-6 typically)
  const digits = [
    2 + Math.floor(Math.random() * 5), // 2-6
    ...Array(7).fill(0).map(() => Math.floor(Math.random() * 10))
  ];

  // Calculate check digit
  const checkDigit = calculateMedicareCheckDigit(digits);
  digits.push(checkDigit);
  digits.push(irn);

  return digits.join('');
}

// Format Medicare number
function formatMedicare(medicare) {
  const clean = String(medicare).replace(/\D/g, '');
  return clean.replace(/(\d{4})(\d{5})(\d{1})/, '$1 $2 $3');
}

// Generate with expiry
function generateMedicareCard(irn = 1) {
  const number = generateMedicare(irn);
  const now = new Date();
  const expiry = new Date(now.getFullYear() + Math.floor(Math.random() * 5) + 1, Math.floor(Math.random() * 12), 1);

  return {
    number: formatMedicare(number),
    irn: irn,
    expiry: `${String(expiry.getMonth() + 1).padStart(2, '0')}/${expiry.getFullYear()}`
  };
}

// Examples
console.log(generateMedicareCard(1));
// { number: "2345 67890 1", irn: 1, expiry: "06/2027" }

console.log(validateMedicare('2345 67890 1')); // Depends on check digit

Complete Medicare number generation with check digit validation and formatting.

Tips & Best Practices

• IRN must be 1-9 (position 10)
• Check digit uses specific weights [1,3,7,9,1,3,7,9]
• Generate multiple IRNs for family card testing
• Include expiry date in test data
• Format with spaces for display

Common Mistakes to Avoid

• Using for real healthcare claims (illegal)
• Wrong weight sequence for check digit
• Forgetting IRN must be 1-9, not 0
• Not validating 10-digit length
• Missing expiry date in test scenarios

When to Use This Tool

Use for testing Australian healthcare software, patient management systems, or Medicare claiming integrations. Never use generated numbers for actual healthcare services.

Frequently Asked Questions

Can I use generated numbers for real claims?

No. Generated numbers aren't linked to real people. Medicare fraud is a criminal offense. Use only for software testing.

What is the IRN?

Individual Reference Number (1-9) identifies the person on a family card. Position 10 of Medicare number. Each family member has unique IRN on same card.

How do I validate a real Medicare number?

Check format and check digit locally, then verify with Services Australia API (requires registration). Generator creates valid format but not registered numbers.

What about card expiry?

Medicare cards have MM/YYYY expiry. Generate future dates for testing. Expired cards should fail validation in your system.

Get Started

Ready to try Medicare Generator? Use the tool now - it's free, fast, and works right in your browser.

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Last updated: June 27, 2026