PR-85: Patient Interest Adjustment
Interest charges are the patient's responsibility. Post to the patient account and collect. Dispute with the payer if the interest stems from a payer processing error.
What Does PR-85 Mean?
PR-85 is the only valid group code for CARC 85. The payer is explicitly designating the interest charge as the patient's financial obligation. This could result from patient non-payment on an outstanding balance, interest accrued during claim processing delays, or interest required under state prompt-pay statutes when the underlying charge is the patient's responsibility.
CARC 85 is unique among adjustment codes because it is restricted to a single group code: PR (Patient Responsibility). When this code appears on a remittance, the payer is adding an interest component to the patient's financial obligation. This is not a claim denial or a reduction in provider payment — it is an adjustment to what the patient owes.
The interest charges behind CARC 85 can arise from several scenarios. Most commonly, the patient has an overdue balance on which interest has been accruing per the terms of their payment agreement or the provider's billing policy. In other cases, a payer's delayed claim processing pushed the resolution timeline out far enough to trigger interest under state prompt-pay laws, and that interest liability is assigned to the patient because the underlying charge is the patient's responsibility.
Because CARC 85 is always PR, the provider's action is straightforward: post the interest amount to the patient's account and collect it as part of the patient balance. However, billing staff should verify the interest calculation before posting. If the interest accrued due to a payer processing error rather than patient non-payment, the provider may have grounds to dispute the interest assignment with the payer. Additionally, state regulations vary on whether and how interest can be charged on patient medical balances — compliance staff should ensure the interest amount aligns with applicable state law.
Common Causes
| Cause | Frequency |
|---|---|
| Late payment by insurance company triggering interest The payer delayed processing or payment beyond contractual or regulatory timeframes, resulting in interest charges that accrue on the patient's account as part of the overall balance adjustment | Most Common |
| Patient non-compliance with payment terms The patient failed to make timely payments on their balance according to the agreed-upon payment plan or terms, and interest charges were applied to the outstanding amount | Most Common |
| Claim denial resulting in patient interest liability A denied claim made the patient responsible for the full charge, and interest accrued during the time between the denial and patient notification or payment | Common |
| Delayed claim submission by provider The provider submitted the claim late, causing delayed adjudication and subsequent interest charges that are passed to the patient's account | Common |
| Coordination of benefits delays Disputes or processing delays between multiple insurers prolonged claim resolution, and interest charges accumulated during the extended processing period | Occasional |
| State prompt-pay law interest requirement Some states require payers to add interest when claims are not paid within mandated timeframes. This interest may be reflected as a patient adjustment when the underlying charge is the patient's responsibility | Occasional |
How to Resolve
Verify the interest calculation, post it to the patient's account, and collect the total balance including interest.
- Validate the interest amount Review the interest rate, time period, and principal balance to confirm the calculation is correct. Cross-reference with your patient payment agreement terms.
- Check state compliance Verify the interest charge complies with your state's medical billing interest regulations. Ensure required notices were issued to the patient before interest began accruing.
- Post and bill the patient Add the interest charge to the patient's balance. Send a statement that separates the principal balance from the interest amount with a clear explanation of how the interest was calculated.
- Pursue collection Enter the total balance (principal plus interest) into your patient collections workflow. For large balances, offer a payment plan that addresses both the principal and the interest.
This adjustment is correct per the patient's benefit plan. The amount is the patient's financial responsibility. Collect from the patient rather than appealing.
Common RARC Pairings
The RARC code tells you exactly what triggered the PR-85:
| RARC | Description |
|---|---|
| N115 | Alert: This adjustment represents interest charges applied to the patient's outstanding balance. |
| N381 | Alert: Consult your contractual agreement or state regulations for interest charge rules and patient billing guidelines. |
How to Prevent PR-85
- Submit claims promptly to avoid processing delays that could trigger interest charges assigned to the patient
- Verify patient eligibility and benefits before service delivery to minimize denials that delay payment and lead to interest accrual
- Maintain accurate patient demographic and insurance data to prevent claim rejections that extend the billing timeline
- Implement clear financial policies that explain interest charges upfront so patients understand their obligations
- Follow up on aged patient balances before interest thresholds are reached to encourage timely payment
- Stay current on state prompt-pay laws and medical billing interest regulations to ensure compliance
General Prevention
- Submit claims within required timeframes to avoid processing delays that could generate interest charges
- Verify patient benefits and eligibility before service delivery to reduce claim denials that lead to delayed payment and interest accrual
- Maintain accurate patient demographic and insurance information to prevent claim rejections that prolong the payment cycle
- Implement clear patient payment policies with transparent terms about interest charges on overdue balances
- Monitor claim processing timelines and follow up on aged claims before interest triggers are reached
- Train staff on state-specific prompt-pay regulations that may affect interest charge calculations