PR-45 & Balance Billing in Dental: What It Means and When It's Improper (2026)

Q: What does PR-45 mean?

Reason code 45 is 'charge exceeds fee schedule/maximum allowable or contracted fee arrangement.' The PR (Patient Responsibility) group in front of it routes that amount to the patient. For an in-network provider, 45 is normally a contractual write-off under the CO group — so PR-45 on an in-network claim is usually incorrect.

Q: Is balance billing allowed in dental?

For covered services from an in-network (participating) dentist, no — the participating-provider agreement requires the amount above the allowed fee to be written off, not billed to the patient. Out-of-network situations depend on state law and the plan. Dental is largely governed by the provider contract rather than the federal No Surprises Act, which mainly addresses surprise medical bills.

Q: How do I fix a PR-45?

If you are in-network, the reason-45 amount should be a contractual write-off (CO-45), not patient responsibility. Do not bill the patient. Post it as a write-off, and if the remittance itself assigned it to the patient in error, request corrected adjudication from the payer.

The group code in front of "45" decides who pays. Get it wrong, and you either lose revenue or bill a patient for money you agreed to write off.

Reason code 45 — "charge exceeds fee schedule/maximum allowable or contracted fee arrangement" — is one of the most common lines on a dental remittance. What matters is the group code in front of it. As CO-45 (Contractual Obligation), it's a write-off the in-network provider absorbs. As PR-45 (Patient Responsibility), the payer is telling you to bill the patient for that amount — which, for an in-network claim, is usually balance billing, and usually improper.

Why PR-45 is a red flag in-network

When you sign a participating-provider agreement, you agree to accept the plan's allowed amount as payment in full for covered services. The difference between your billed charge and the allowed amount is a contractual write-off — it belongs under CO. If it shows up under PR and lands on the patient's statement, one of two things went wrong: the remittance adjudicated it incorrectly, or it was posted to patient responsibility in error at your office. Either way, the patient shouldn't be billed.

ClaimZen reads the group code on every adjustment, flags reason-45 amounts routed to patient responsibility on in-network claims, and surfaces them before they hit a patient statement — with the correction documented.

When the patient can be billed

Legitimate patient responsibility. Deductible (PR-1), coinsurance (PR-2), and copay (PR-3) are the patient's — those are billed, not written off.
Non-covered services. If a service isn't a covered benefit, the amount may be the patient's — subject to any pre-treatment disclosure your plan or state requires.
Out-of-network. If you're not participating, balance-billing rules depend on state law and the plan; the contractual write-off obligation may not apply.

How to correct a PR-45

Confirm your network status for that plan. If you're participating, reason 45 is a CO write-off.
Don't bill the patient. Post the amount as a contractual write-off.
If the remittance itself assigned it to the patient in error, request corrected adjudication from the payer, citing your participating agreement.

See the denial-codes reference for how group codes work, and the underpayments guide for the related revenue leaks.

Frequently asked questions

What does PR-45 mean?

Reason 45 ("charge exceeds fee schedule") under the Patient Responsibility group. For an in-network provider, 45 is normally a CO contractual write-off, so PR-45 on an in-network claim is usually incorrect.

Is balance billing allowed in dental?

For covered services from a participating dentist, no — the amount above the allowed fee is written off, not billed to the patient. Out-of-network depends on state law and plan. Dental is governed mainly by the provider contract, not the federal No Surprises Act.

How do I fix a PR-45?

If you're in-network, treat reason 45 as a CO write-off — don't bill the patient. If the remittance assigned it to the patient in error, request corrected adjudication.

Sources

X12, Claim Adjustment Reason Codes: reason 45; group codes CO (Contractual Obligation) and PR (Patient Responsibility).

General information, not billing, legal, or coding advice. Balance-billing rules vary by state, plan, and your provider contract — verify before billing a patient.

PR-45 and balance billing: when a write-off is billed to the patient by mistake