CO-45: Charge exceeds fee schedule
Triage: Contractual write off, not a denial
By Dr. Daniel Turner, DC · Reviewed September 2, 2026
What does denial code CO-45 mean?
This is not a denial at all. It is the contractual difference between what you billed and what your contract with the payer allows. It appears on nearly every paid claim.
What does CO-45 usually mean in a chiropractic office?
The danger is treating it like a balance. The CO-45 amount is never patient billable when you are in network. Billing patients for contractual adjustments is a contract violation and one of the fastest ways to generate complaints.
How do you fix a CO-45 denial?
- Post the payment, adjust the CO-45 amount off as contractual, and move on.
- Watch the pattern over time: if allowed amounts shrink, that is a fee schedule change worth confirming with the payer.
What this looks like in practice
You bill 98941 at $85 against a contract that allows $52. The ERA shows a CO-45 of $33 on the line beside the payment. Nothing went wrong; the number is your negotiated discount showing itself on every claim. The failure mode is a biller moving that $33 to the patient, which violates the contract.
How to stop it from happening again
- ✓Post contractual adjustments automatically from the ERA so nobody hand keys them onto patient balances
- ✓Track allowed amounts per payer per code over time; a shrinking allowable is a fee schedule change worth confirming
How Cervica handles CO-45
When a biller reviews and posts an ERA, Cervica records the contractual adjustment separately from patient responsibility. The payment learning table tracks allowed amounts per code per payer so a quiet fee schedule change shows up as a variance.
Related codes
- →PR-100 / CO-100 · Payer paid the patient, not the practice
- →PR-119 / CO-119 · Benefit maximum reached
- →98940 · the CPT side of this denial
Quick answers
What does denial code CO-45 mean?
This is not a denial at all. It is the contractual difference between what you billed and what your contract with the payer allows. It appears on nearly every paid claim.
What does CO-45 usually mean in a chiropractic office?
The danger is treating it like a balance. The CO-45 amount is never patient billable when you are in network. Billing patients for contractual adjustments is a contract violation and one of the fastest ways to generate complaints.
How do you fix a CO-45 denial?
Post the payment, adjust the CO-45 amount off as contractual, and move on. Watch the pattern over time: if allowed amounts shrink, that is a fee schedule change worth confirming with the payer.
General information for billing teams, not legal or payer specific advice. CARC definitions belong to X12; payer policies vary and control. Verify against the payer contract before acting on any individual claim.