CARC P5 Active

CO-P5: Reasonable and Customary Fee Adjustment — P&C Only

TL;DR

CO-P5 is a P&C reasonable and customary fee adjustment. Dispute with prevailing charge documentation if the rate is below market.

Action
Review & Decide
Who Pays
Provider
Appeal
Yes
Patient Impact
None
Disclaimer
This content is for informational purposes only and does not constitute professional billing advice. Always verify information against your payer contracts and current coding guidelines. Consult a certified billing specialist for specific claim issues.

What Does CO-P5 Mean?

When paired with Group Code CO, the R&C adjustment is contractual for P&C claims. The provider absorbs the difference. Dispute with prevailing charge data if the rate is below market.

CARC P5 applies exclusively to property and casualty claims and indicates the payer adjusted the charges to match reasonable and customary (R&C) rates for the service in the provider's geographic area. This code appears when no state-legislated fee schedule applies, so the payer applies its own R&C methodology.

R&C determinations are based on surveys of prevailing charges in the geographic area. If your charges exceed the payer's R&C rate, the difference is adjusted. Unlike state fee schedule adjustments (P12), R&C rates are set by the individual payer rather than by statute, which makes them more negotiable.

Disputing an R&C determination typically involves providing evidence of prevailing charges in your area from fee surveys, published databases, or comparable payer reimbursement data showing the payer's R&C rate is below market.

Common Causes

Cause Frequency
Charges exceed reasonable and customary rates The billed charges exceed the P&C payer's reasonable and customary (R&C) fee determination for the service in the geographic area Most Common
No legislated fee schedule applicable There is no state-mandated fee schedule for this P&C service, so the payer applies its own R&C determination Most Common
Geographic fee variation The R&C determination is based on the geographic area and the provider's charges exceed the area standard Common

How to Resolve

  1. Check the R&C rate Compare the allowed amount to prevailing charges.
  2. Gather fee data Collect fee surveys and comparable payer rates.
  3. Dispute if below market Submit a fee dispute with prevailing charge evidence.
  4. Negotiate directly Contact the P&C adjuster for rate negotiation.
Appeal Guide

Dispute the R&C determination with documentation of prevailing charges in your geographic area. Include fee surveys, published fee databases, and documentation from other P&C payers showing higher allowed amounts for the same service.

Common RARC Pairings

The RARC code tells you exactly what triggered the CO-P5:

RARC Description
N381 Alert: Consult your contractual agreement for restrictions, billing, and payment information. Review the payer's R&C fee schedule and your agreement for payment terms →

How to Prevent CO-P5

Also Filed As

The same CARC P5 may appear with different Group Codes:

OA-P5 PR-P5

Related Denial Codes

CO-24 — Charges Covered Under Capitation/Managed Care CO-44 — Prompt-Pay Discount CO-45 — Charge Exceeds Fee Schedule/Maximum Allowable CO-69 — Day Outlier Amount CO-70 — Cost Outlier Adjustment

Sources

  1. https://x12.org/codes/claim-adjustment-reason-codes
  2. https://www.cms.gov/medicare/coordination-benefits
  3. Codes maintained by X12. Visit x12.org for official definitions.