Statutory Text (Selected Highlights):
Labor Code §4603.2(a):
Upon submission of the billing for medical treatment, the employer shall pay for the medical treatment provided or object to the treatment provided within 45 working days of receipt of each separate itemized billing, unless the billing is contested.Labor Code §4603.2(b):
If the billing is contested, denied, or considered incomplete, the employer shall provide an explanation of review that states the reasons for the action taken and the decision regarding the services billed.Labor Code §4603.2(d):
If payment is not made timely as required by this section, the amount of payment shall be increased by 10 percent and shall carry interest at the rate of 7 percent per annum.Labor Code §4603.2(e):
The employer is not liable for payment of medical treatment unless the physician is authorized to provide treatment pursuant to this division.
Understanding Labor Code §4603.2 – Medical Billing and Payment Timelines in California Workers’ Comp
When you’re injured at work and receive treatment, the billing process behind the scenes has strict rules under California law. Labor Code §4603.2 governs how quickly employers and insurance companies must pay medical providers—and what happens when they don’t.
This law protects both doctors and injured workers by ensuring timely payment for services rendered, which in turn ensures access to care.
What This Law Requires
When a doctor or clinic submits a bill for treating a work-related injury, the employer or insurer must do one of two things within 45 working days:
- Pay the bill in full, or
- Deny or contest the bill and issue an Explanation of Review (EOR) that details:
- Why the payment is denied or reduced
- What information is missing
- The legal or factual basis for the denial
This timeline applies to every individual billing submitted—not just the first one.
What Happens if They Miss the Deadline?
If the insurance company or employer fails to pay or object within 45 working days, they owe:
- A 10% penalty on the amount due
- 7% interest per year from the date payment was due
This means delays are costly—and they’re supposed to be. The law is designed to encourage prompt payment and keep the treatment process moving smoothly for injured workers.
What If the Billing Is Incomplete?
If the billing is missing key documentation, the employer can issue a denial. However, they must still follow strict rules and provide an EOR explaining what’s missing. The delay must be justified and specific.
This prevents employers from using vague or bad-faith denials to stall payment.
Who Is Eligible for Payment?
Per subsection (e), payment responsibility only applies to authorized physicians—those who are:
- In the Medical Provider Network (MPN)
- Approved by Utilization Review (UR)
- Treating in compliance with the workers’ compensation system
If a doctor isn’t authorized, the employer may not be liable for their services—even if they provided needed treatment.
Why Labor Code §4603.2 Matters
This law ensures:
- Doctors get paid, so they continue treating injured workers
- Injured workers don’t face care delays due to behind-the-scenes payment issues
- Employers and insurers are held accountable for slow payments
When the system works properly, treatment flows smoothly. But when insurers abuse delays, it can lead to denied care and disrupted recovery.
How EFLL Can Help
At Employees First Labor Law, we help injured workers:
- Understand why their care is being delayed
- Demand compliance with Labor Code §4603.2
- File penalty claims for late payments or improper denials
- Ensure that physicians in their case are authorized and reimbursed
We also work with medical providers who are owed payments and need help navigating the workers’ comp billing system.
Getting the Care You Deserve Starts with Timely Payment
If your treatment is being denied or delayed due to billing issues, you don’t have to fight alone. Contact Employees First Labor Law today for a free consultation. We’ll ensure your rights—and your medical care—are protected every step of the way.
📚 Learn More
Want to understand more key protections under California law? Check out our full guide:
👉 Top 25 California Labor Codes for Workers’ Comp
Contact Employees First Labor Law to make sure your medical rights are protected and your recovery isn’t compromised.
