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CO-P29 Denial Code: Liability Benefits Fee Schedule

CO-P29 means an auto insurer reduced the billed charge to the amount allowed under a jurisdictional fee schedule for liability benefits. It's the liability coverage version of a fee schedule adjustment.

Quick facts

Code
CO-P29 (CARC P29)
Status
Active In use since November 1, 2017.
Code set
Claim Adjustment Reason Codes (CARC)
Group codes
  • CO (Contractual Obligation): The usual group. The reduction follows the applicable fee schedule; state rules decide whether the claimant can be billed for any difference.
Official description
Liability Benefits jurisdictional fee schedule adjustment. Usage: If adjustment is at the Claim Level, the payer must send and the provider should refer to the 835 Class of Contract Code Identification Segment (Loop 2100 Other Claim Related Information REF). If adjustment is at the Line Level, the payer must send and the provider should refer to the 835 Healthcare Policy Identification Segment (loop 2110 Service Payment information REF) if the regulations apply. To be used for Property and Casualty Auto only.
X12 Claim Adjustment Reason Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What CO-P29 means

CARC P29 is a liability benefits jurisdictional fee schedule adjustment. X12 limits it to property and casualty auto claims.

Most auto fee schedules apply to first-party benefits such as PIP. In some jurisdictions, a fee schedule also applies to certain liability benefits. When a carrier prices a bill under such a schedule, it reduces your charge to the schedule amount and reports the difference with CO-P29.

The P&C fee schedule codes form a set, one for each coverage line:

  • CO-P12 for workers’ compensation.
  • CO-P23 for MPC and PIP.
  • CO-P29 for liability benefits.

The usage note points to the contract or schedule reference in the 835 class of contract code segment (loop 2100 REF) for claim-level adjustments, and the healthcare policy identification segment (loop 2110 REF) for line-level ones.

Common causes

  • Charges above the schedule amount, the normal case.
  • Wrong schedule version for the date of service.
  • Wrong region or locality.
  • Modifier or facility rules applied incorrectly.
  • Schedule applied where it doesn’t govern the coverage in question.

How to check it

  1. Identify the schedule the carrier cited and confirm it applies to this claim and jurisdiction.
  2. Calculate the expected allowance for the code, modifiers, and region.
  3. Compare it with the payment.
  4. Post valid reductions as adjustments.
  5. Dispute errors through reconsideration and the state’s process, within its deadlines.
  6. Check state rules before billing the claimant for any difference.

How to prevent problems

  • Know which jurisdictions apply fee schedules to liability benefits.
  • Keep those schedules current in your billing system.
  • Review carrier reductions regularly to catch misapplied schedules.

Specialty notes

Providers near state lines should confirm which jurisdiction’s rules govern an auto claim, since the accident location, policy state, and treatment state may differ.

Remark codes that may appear with CO-P29

  • N600 (Adjusted based on the applicable fee schedule for the region in which the service was rendered.): Adjusted based on the fee schedule for the region where the service was rendered.
  • N608 (The fee schedule amount allowed is calculated at 110% of the Medicare Fee Schedule for this region, specialty and type of service.): An example of a schedule calculated as a percentage of the Medicare fee schedule.
  • CO-P12 (Workers' compensation jurisdictional fee schedule adjustment.): The workers' comp jurisdictional fee schedule adjustment.
  • CO-P23 (Medical Payments Coverage (MPC) or Personal Injury Protection (PIP)): The MPC and PIP fee schedule adjustment.
  • CO-P28 (Payment adjusted based on the Liability Coverage Benefits jurisdictional regulations and/or payment policies.): A liability adjustment for reasons other than fee schedule pricing.
  • CO-P5 (Based on payer reasonable and customary fees.): Reasonable and customary pricing when no legislated schedule applies.

CO-P29 FAQ

Do liability carriers use fee schedules?

In most places liability coverage isn't governed by a medical fee schedule, but some jurisdictions apply one to certain auto liability benefits. When a schedule applies, carriers report the reduction with CO-P29.

Where does the payer identify the schedule?

At claim level, in the 835 class of contract code segment (loop 2100 REF). At line level, in the healthcare policy identification segment (loop 2110 REF), when regulations apply.

How do I verify a CO-P29 amount?

Identify the schedule and version cited, calculate the allowance for your code and region, and compare it to the payment.

Is CO-P29 used for workers' comp?

No. X12 limits it to property and casualty auto claims. Workers' comp uses CO-P12.

Is CO-P29 a denial?

No. The line was paid at the fee schedule allowance. It needs attention only if the allowance is lower than the schedule actually provides.

Can I bill the injured person for the difference?

It depends on the jurisdiction. Where a fee schedule governs, balance billing is often restricted. Confirm the rules for the state that governs the claim.