The Converter tab converts National Drug Codes between 10-digit and 11-digit formats.

NDCs come in two main formats:

• 10-digit NDC — The format printed on drug labels, with three segments separated by hyphens. There are three possible configurations:
  • 4-4-2 — e.g., 0071-0155-23
  • 5-3-2 — e.g., 12345-123-01
  • 5-4-1 — e.g., 12345-1234-1
• 11-digit NDC — The standardized format used in billing and claims, always formatted as 5-4-2 with zero-padding

1. Tap the Converter tab
2. Enter an NDC in any format (with or without hyphens)
3. Tap Convert
4. The app displays:
   • 10-digit NDC — Original format
   • 11-digit NDC — Zero-padded 11-digit code
   • 11-digit formatted — With hyphens (5-4-2)

10-digit to 11-digit: The app detects which segment is “short” based on the hyphenated format and adds a leading zero to that segment:

• 4-4-2 → 04444-4444-22 (zero added to first segment)
• 5-3-2 → 55555-0333-22 (zero added to second segment)
• 5-4-1 → 55555-4444-01 (zero added to third segment)

11-digit to 10-digit: The app identifies which segment has a leading zero that can be removed and strips it.

Important: A plain 10-digit NDC without hyphens is ambiguous — the app cannot determine the segment configuration. Always include hyphens when entering a 10-digit NDC.

Tap the converted NDC values to copy them to your clipboard.