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N601 Remark Code: Hawaii Motor Vehicle RBRVS Payment

N601 means the auto insurer's recommended payment follows Hawaii Administrative Rules, Title 16, Chapter 23 (Motor Vehicle Insurance Law), which base payment on the Medicare Resource Based Relative Value Scale (RBRVS) applicable to Hawaii.

Quick facts

Code
N601 (RARC N601)
Status
Active In use since July 15, 2013.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The reduction to the Hawaii RBRVS-based amount. Hawaii's motor vehicle rules govern whether the difference can be billed to the patient.
Official description
In accordance with Hawaii Administrative Rules, Title 16, Chapter 23 Motor Vehicle Insurance Law payment is recommended based on Medicare Resource Based Relative Value Scale System applicable to Hawaii.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N601 means

Hawaii’s motor vehicle insurance rules tie medical payments for auto injuries to Medicare’s physician fee methodology as it applies in Hawaii. N601 tells you the carrier calculated the payment for this service that way, citing Hawaii Administrative Rules Title 16, Chapter 23.

This is a state-specific property and casualty remark code. It usually appears with CARC P23, P22, or 45.

How to verify the amount

  1. Identify the Medicare RBRVS amount for the service in Hawaii for the date of service, including the correct modifiers.
  2. Compare it with the allowance on the remittance.
  3. Check for adjustments that Hawaii’s rules or the carrier apply on top of the Medicare base, and ask the carrier to explain any you don’t recognize.
  4. Account for multiple-procedure and similar rules that also reduce Medicare amounts.

If the allowance looks wrong

  • Send the carrier a written request for reconsideration with your calculation and the rule citation.
  • Confirm that the procedure codes and modifiers on the claim match the documentation, since those drive the RBRVS amount.
  • Follow Hawaii’s dispute process for auto medical bills if the carrier doesn’t correct it.

Staying ahead

Keep a Hawaii motor vehicle rate table alongside your other payer fee schedules so allowances can be checked when payments post. How CARC and RARC codes work together explains how to read this remark with its paired CARC.

Codes that may appear with N601

  • CO-P23 (Medical Payments Coverage (MPC) or Personal Injury Protection (PIP)): A PIP or medical payments jurisdictional fee schedule adjustment.
  • CO-P22 (Payment adjusted based on the Medical Payments Coverage (MPC) and/or Personal Injury Protection (PIP)): Adjusted under PIP or medical payments jurisdictional rules.
  • CO-45 (Charge exceeds fee schedule/maximum allowable or contracted/legislated fee arrangement.): The charge exceeds the fee schedule or maximum allowable amount.
  • N599 (Our payment for this service is based upon a reasonable amount pursuant to both the terms and conditions of the policy of insurance under which the…): Florida's no-fault reasonable amount based on Medicare Part B.
  • N606 (The Oregon allowed amount for this procedure is based upon the Workers Compensation Fee Schedule (OAR 436-009).): Oregon's PIP allowance based on the workers' compensation fee schedule.
  • N669 (Adjusted based on the Medicare fee schedule.): A general adjustment based on the Medicare fee schedule.

N601 FAQ

Does N601 apply to Hawaii health plans?

No. It refers to Hawaii's motor vehicle insurance rules and appears on auto injury claims.

What is RBRVS?

The Resource Based Relative Value Scale, the system Medicare uses to set physician fees from relative value units, geographic adjustments, and a conversion factor.

Why does it say 'recommended'?

The official wording describes the payment as recommended under the rule. Treat it as the carrier's allowance and use the carrier's dispute process if you disagree.