What Is an NPI Number? Complete Guide to National Provider Identifiers
May 01, 2020 Revised: September 02, 2026Learn what an NPI number is, who needs one, how NPIs are used in healthcare claims, and how to look up and validate a National Provider Identifier.
Medical Claim Resubmission: When Should You Resubmit?
September 01, 2026Learn when to resubmit a medical claim and when a corrected claim, replacement, void, reconsideration or appeal may be the appropriate next step.
Duplicate Medical Claim Denials: Causes & How to Avoid Them
August 31, 2026Learn why medical claims may be denied as duplicates, what Medicare CARC 18 means, and what to review before correcting or resubmitting a duplicate claim.
How to Correct a Medical Claim After It Has Been Paid
August 30, 2026Learn what to review when an error is found after a medical claim has been paid, including corrected claims, replacements, voids, overpayments and payer requirements.
Payer Claim Control Number & Original Reference Number
August 29, 2026Learn what a Payer Claim Control Number and Original Reference Number are, where to find them, and how they are used for replacement and void claims.