PR-45 denial code
The charge exceeds the fee schedule or allowed amount, and unlike CO-45, the PR prefix marks the excess as the patient's. That grouping is only legitimate in specific situations, so this code deserves a suspicious read before anyone gets billed.
PR: Patient Responsibility. The amount is the patient's to pay: deductible, coinsurance, or copay. These are not denials, and they are collectible.
Why you got it
- 1A genuinely out-of-network claim where the plan pays its OON allowance and leaves the balance to the patient.
- 2A payer grouping error: an in-network claim's contractual write-off mislabeled PR (it happens), and it invites a balance bill your contract forbids.
- 3A service where the patient accepted charges above the allowance in writing beforehand.
How do I fix a PR-45 denial?
- Establish network status for this plan and date first. If you are in-network, the excess is a write-off no matter what the prefix says: flag the remit error to the payer and do not bill the patient for it.
- If out-of-network, check surprise-billing protections (emergency care, OON providers at in-network facilities) before billing; where they apply, the patient owes in-network cost sharing and the rest is between you and the plan.
- Where balance billing is genuinely permitted and disclosed, bill the balance, with an explanation, because this bill is the kind patients call about.
How to stop the next one
Post by rule, not by prefix. A posting process that blindly bills whatever lands in PR will eventually balance-bill someone your contract or federal law says you can't, and that mistake costs more than the balance.
Our diagnosis scrubber will not catch this one. PR-45 is driven by procedure codes, modifiers, or eligibility rather than by the diagnosis set, and procedure-side checking needs CPT codes, which aren’t included yet. We would rather tell you that than sell you a tool that quietly misses your most common denial.
If denials like this are a volume problem rather than a one-off, the denial management page explains how the paid workspace catches the coding causes on every claim, and the free ICD-10-CM lookup shows the coding notes behind any diagnosis code on the remittance.