What is Workers’ Compensation Bill Review?

Medical costs are the dominant financial driver in workers’ compensation. For claims professionals, keeping those costs accurate and defensible is crucial. Workers’ compensation bill review is the structured process that makes that possible.

Why Workers’ Compensation Bill Review Matters

The financial impact of workers’ compensation claims is substantial, and medical costs make up a large share of those expenses. According to NCCI’s 2025 State of the Line Guide, medical expenses account for about 90% of total costs in claims with more than $5 million in incurred losses. Even routine claims are becoming more expensive, with NCCI reporting a 6% increase in medical lost-time claim severity in accident year 2024.

At the same time, medical billing is highly complex, which increases the risk of mistakes and improper charges. Common issues include upcoding, duplicate billing, unbundling procedure codes, and billing for services that were never provided. These problems are well documented across the healthcare system. In one California case pursued by the U.S. Department of Justice, a provider was ordered to repay more than $11 million related to billing practices that included charges for services never rendered.

None of this suggests that providers should be viewed with suspicion. Most bill accurately and in good faith. However, it does highlight the importance of having a strong review process in place. Coding rules change often, billing requirements are detailed, and even unintentional errors can lead to significant unnecessary costs if they are not identified early.

What is Workers’ Compensation Bill Review?

Workers’ compensation bill review is a detailed review of medical bills submitted for injured workers. The goal is to confirm that charges are accurate, medically necessary, properly coded, and compliant with state regulations before payment is made.

Effective bill review checks each bill against several key standards:

• State fee schedules set the maximum amount that can be paid for specific medical services in each state. If a bill exceeds those limits, the charges are reduced to the allowed amount. Research from NCCI shows that states with fee schedules tend to have slower medical cost growth than those without them.
• AMA CPT® coding guidelines create a standardized system for medical billing codes. Bill review helps ensure the codes used on a bill accurately match the services that were actually performed and follow AMA coding rules.
• NCCI edits help identify billing mistakes, such as code combinations that should not be billed together. These edits are designed to prevent issues like unbundling, which can improperly increase reimbursement.
• State-specific workers’ compensation rules add another layer of review because every state has different requirements, coverage rules, and billing procedures.
• PPO and specialty network agreements may provide discounted contracted rates that lower costs beyond the standard fee schedule.
• Usual and Customary (U&C) reviews are used in states without fee schedules to compare charges against what other providers in the same area typically bill for similar services.

A Step-by-Step Look at the Bill Review Process

Understanding how bill review actually flows helps claims adjusters set appropriate expectations, catch issues early, and make better use of the information the process generates.

Step 1: Intake and Coding Review

When a medical bill is received, the first step is checking that the billing and diagnosis codes are correct. This includes making sure the CPT® procedure codes match the services provided, the diagnosis codes are supported by medical records, and the billing follows AMA coding guidelines. This step also catches obvious issues early, such as incorrect codes, missing modifiers, or unsupported charges.

Step 2: Fee Schedule and Network Discounts

After the coding is confirmed, the bill is reviewed against the state’s workers’ compensation fee schedule to make sure charges stay within the allowed reimbursement limits. Any applicable PPO or network discounts are also applied. Because fee schedules are updated regularly across different states, staying current is an important part of accurate bill review.

Step 3: Medical Necessity Review

Some bills require a closer clinical review based on factors like the total cost, type of treatment, or diagnosis involved. In these cases, medical bill analysts or nurses evaluate whether the treatment relates to the workplace injury, whether the services were medically necessary, and whether the billing accurately reflects the care that was provided.

Step 4: Error and Fraud Detection

The final step focuses on identifying billing problems such as duplicate charges, incorrect code combinations, upcoding, or charges for services that are not covered. Catching these issues early can help reduce unnecessary costs and may also reveal larger billing patterns that deserve additional review over time.

Final Thoughts

Workers’ compensation bill review can produce cleaner claims files, stronger documentation, and savings that compound across an entire caseload, but its real value comes from where it sits within a broader medical management strategy.

The billing environment is complex, coding standards evolve constantly, and errors compound quietly over time. Understanding how the process works, and what it can and can’t do on its own, is essential for any claims professional serious about controlling medical spend.

Want to see how structured bill review can improve accuracy and control medical costs in your claims process? Connect with our experts today.

Check out our sources:

American Medical Association. “CPT® Overview and Code Approval.” AMA, 2025, www.ama-assn.org/practice-management/cpt/cpt-overview-and-code-approval.

Glenn, Donna. 2025 State of the Line Report. National Council on Compensation Insurance, May 2025, www.ncci.com/Articles/Documents/AIS2025-SOTL-Presentation.pdf.

National Council on Compensation Insurance. 2025 State of the Line Guide. NCCI, May 2025, www.ncci.com/SecureDocuments/SOLGuide_2025.html.

National Council on Compensation Insurance. “Inflation and Workers Compensation Medical Costs—Physician Services.” NCCI, 7 Feb. 2023, www.ncci.com/Articles/Pages/Insights-Inflation-WorkersComp-Medical-Costs-Physician-Services-Redirect.aspx.

Sinclair, Jon, and Katherine Norris. “Medicare Fee Schedules and Workers Compensation in 2024.” National Council on Compensation Insurance, 20 June 2024, www.ncci.com/Articles/Pages/Insights-Medicare-Fee-Schedules-and-Workers-Compensation-in-2024.aspx.

United States, Department of Labor, Office of Workers’ Compensation Programs. “Medical Fee Schedule Instructions.” DOL, 2025, www.dol.gov/agencies/owcp/medical.