An Internal Control Number (ICN) is a unique 13-digit identifier assigned to healthcare claims during processing. It acts as a digital fingerprint, enabling providers and payers (like Medicare) to track claims, resolve disputes, and ensure accurate reimbursement.
ICNs are structured to encode critical details:
Example: ICN 2411123456789 = 2024 claim, professional type, processed by MAC “112”.
ICN | DCN |
Tracks claim only | Tracks all documents (claims, attachments, appeals) |
Assigned at claim submission | Generated for any system entry (e.g., appeals, corrections) |
Critical for reimbursement | Used for broader record-keeping |
For VA-related claims, a Veteran Internal Control Number is used to track veteran-specific medical billing. It follows the same principles as standard ICNs but links to VA funding systems for seamless reimbursement.
No—ICNs remain active indefinitely for audit purposes.
Contact the payer immediately; claims without ICNs risk delays or denials.
Most do, but formats vary. Always confirm with the payer’s guidelines.
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