In this guide7 sections
Labor Code §4603.2 sets the rules for how doctors and other providers bill for treating a work injury in California, and how fast the employer or its insurer must pay. In most cases the payer has 45 days after receiving an itemized bill to pay it, with an explanation of review, and it must tell the provider within 30 days if it is contesting, denying or treating the bill as incomplete. Late payments carry a 15% increase plus interest. For you as the injured worker, the key point is that these disputes are between the provider and the payer, and a provider generally can’t bill you while your claim is pending.
Key takeaways
- Payers generally must pay a provider’s itemized bill within 45 days of receipt (60 days for government employers), at rates set by the official medical fee schedule.
- If a bill is contested, denied or incomplete, the provider must be notified within 30 days, and an incomplete-bill notice must say what’s missing.
- Late-paid amounts increase by 15%, plus interest at the rate for civil judgments, unless the payer meets the deadline and explains its review.
- Under Labor Code §3751(b), once you’ve filed a claim form, a provider who knows the claim is pending generally can’t collect from you directly.
What Labor Code §4603.2 says
Section 4603.2 has several parts. In plain English:
- Physician reports (subdivision (a)). When you choose a treating physician under §4600, the employer must be told the doctor’s name and address, and the doctor must report to the employer within five working days of the first exam. If you were entitled to treat with a doctor outside the employer’s network, the employer pays from the first exam, as long as that report arrived on time.
- What a bill must include (b)(1). Providers submit an itemization of services and charges, required reports, any referral or prescription from the treating doctor, and proof of authorization. For services on or after January 1, 2017, the bill generally must be submitted within 12 months of the date of service, and it must include the provider’s national provider identifier.
- Payment deadline and penalty (b)(2)–(3). Payment at fee schedule rates is due within 45 days of receiving each separate itemization, or 60 days for a governmental employer. Notice of a contested, denied or incomplete item is due within 30 days. Late amounts are increased by 15% plus interest.
- How bills are reviewed (d). A bill reviewer must have the documents the provider submitted and can’t change billing codes or recommend a lower payment without reviewing them. If payment isn’t recommended as billed, the explanation must give specific reasons.
- Second review and independent bill review (e). A provider that disputes the amount paid may request a second review within 90 days of the explanation of review. The payer must issue a final written decision within 14 days and pay undisputed amounts within 21 days. If the provider still disagrees, it requests independent bill review under §4603.6.
Key deadlines at a glance
| Step | Deadline | Section |
|---|---|---|
| Treating doctor’s first report to employer | 5 working days after the initial exam | §4603.2(a)(1) |
| Provider submits bill (services on or after 1/1/2017) | Generally 12 months from date of service | §4603.2(b)(1)(B) |
| Payer notifies provider that a bill is contested, denied or incomplete | 30 days after receipt | §4603.2(b)(2) |
| Payer pays the bill with explanation of review | 45 days after receipt (60 for government employers) | §4603.2(b)(2)–(3) |
| Provider requests second review | 90 days after the explanation of review | §4603.2(e)(1) |
| Payer’s final decision / payment of undisputed balance | 14 days / 21 days after the request | §4603.2(e)(3) |
| Provider requests independent bill review | 30 days after the second review decision | §4603.6 |
If the provider misses the second-review or independent-review deadline on a dispute only about the amount, the bill is treated as satisfied, and neither the employer nor you owe more.
Why this matters to injured workers
Billing rules can feel like a fight between doctors and insurance companies, but they affect your care. When a payer routinely pays late or underpays, some providers stop accepting workers’ comp patients or delay scheduling. The 15% increase and interest give providers a way to push back without involving you.
More importantly, you are generally protected from the bills themselves. Under Labor Code §3751(b), after you file a claim form, a provider that knows your claim is pending may not collect money directly from you, unless it has received written notice that the employer rejected liability and has given you a copy. A provider that collects unlawfully can owe three times the amount, plus attorney’s fees and costs.
Here is a hypothetical. Teresa injures her wrist at a packing plant and files a DWC-1 claim form. Her claim is accepted, but three months later she receives a past-due notice from the physical therapy clinic. Teresa should send a copy to the claims administrator and tell the clinic, in writing, that her workers’ comp claim is open, with the claim number. The clinic’s remedy is to bill the payer and use the second review and independent bill review process, not to collect from Teresa.
Related sections
- Labor Code §4600 – your right to reasonably required medical treatment.
- Labor Code §4610 – utilization review of treatment requests, which is separate from billing review.
- Labor Code §5814 – penalties owed to you for unreasonable delay of benefits. Section 4603.2 says late-payment liability to providers doesn’t affect the employer’s liability to employees under §5814.
- Labor Code §4603.6 – independent bill review, with a written decision that is binding unless appealed to the Workers’ Compensation Appeals Board within 20 days on narrow grounds.
Frequently asked questions
A doctor’s office sent me a bill for my work injury. Do I have to pay it?
Generally not while your claim is pending, if you’ve filed a claim form and the provider knows about it. Send the bill to the claims administrator, tell the provider in writing that you have an open claim, and keep copies.
What if my claim was denied?
A provider may bill you directly only after it receives written notice that the employer rejected liability and gives you a copy. Some denied claims are later accepted, and providers may file liens in your case instead. See denied workers’ comp claims.
Can I collect the 15% late-payment increase?
No. The §4603.2 increase goes to the provider whose bill was paid late. If your own benefits were unreasonably delayed, a separate penalty under §5814 may apply.
Does the insurer have to pay whatever the doctor charges?
No. Section 4603.2 ties payment to the reasonable maximum amounts in the official medical fee schedule for the date of service.
Talk to a California workers’ comp lawyer
Employees First Labor Law represents workers exclusively in workers’ comp cases across California. We offer free virtual consultations if your treatment is delayed or you’re receiving bills for a work injury. Contact us or call (310) 853-3461. The DWC Information and Assistance Unit also gives free help to injured workers.
This article is general information about California law as of 2026, not legal advice for your situation. Reading it does not create an attorney-client relationship.
