N45: Payment based on authorized amount
The payer paid according to a prior authorization amount rather than the billed charge. If the billed amount is higher than what was authorized, the difference was adjusted off.
Corrective actions
- 1
Compare authorization to billed services
Pull the original authorization and confirm the units, dates, and codes match what was billed; a mismatch is the usual cause of a reduced payment.
- 2
Request an authorization amendment if justified
If additional medically necessary units or services were provided beyond the authorization, contact the payer's utilization management department to request a retroactive amendment before appealing.
Denial codes it is usually paired with
N45 is the detail behind a CARC rather than an adjustment in its own right. These are the denial codes our dataset records it alongside.
Frequently asked questions
What does remark code N45 mean?
The payer paid according to a prior authorization amount rather than the billed charge. If the billed amount is higher than what was authorized, the difference was adjusted off.
Retrieved 2026-07-18.
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Denial7 provides billing and administrative guidance based on published CMS and X12 sources. It is not medical advice, not a coverage determination, and not a guarantee of payment. NCCI and MUE edits are republished quarterly and payer policies vary by contract. Always confirm against the payer's own current policy before submitting or appealing.