California workers' comp

How to appeal a workers' comp bill reduction in California, step by step

California gives providers a two-step appeal for underpaid workers' comp bills: a second bill review by the carrier, then Independent Bill Review by the state. Each step has a hard deadline, and missing one forfeits the money. Here's the whole path, with every clock and the rule behind it.

The timeline

Miss step 2 or step 4 and, if the only dispute is the amount, the bill "shall be deemed satisfied" (LC 4603.2(e)(2); LC 4603.6(a)).

Before you start: is it an amount dispute?

This path is only for disputes over how much a bill should pay. Three kinds of dispute go elsewhere:

• Medical necessity. Utilization review and Independent Medical Review (LC 4610.5).
• Liability, meaning whether the injury or treatment is covered at all. It must be resolved first; the IBR clock doesn't start until it is (LC 4603.6(a)).
• Whether a PPO contract applies. IBR won't decide it (9792.5.7(b)). Send a written demand under LC 4609(c)(2): the payor has 30 business days to prove its right to the discounted rate, or it owes the lesser of your fee or the fee schedule within 10 days.

Step 1: read the EOR

Price every line to the Official Medical Fee Schedule and test every reason code. The EOR guide covers the codes and what to check for each. Keep the envelope: the postmark can set your deadline.

Step 2: second bill review, done right

Use DWC Form SBR-1 as the first page, or the original bill marked with condition codes BG/W3 (9792.5.5(c)). Include the original dates of service and codes (nothing new), the EOR date and claim number, the item and amount in dispute, the payment you want and why, and your support (9792.5.5(d)). A request missing any of these lets the carrier answer outside the 14- and 21-day deadlines (9792.5.5(f)). More on second bill review.

Step 3: Independent Bill Review, done right

File within 30 calendar days of service of the determination, pay $335, index the record into the seven categories the regulation lists, and serve the claims administrator at the same time (9792.5.7(d), (f)). Each request covers one date of service and one code unless you consolidate. Up to 20 disputes can share one fee when they're the same visit, the same code across dates (up to $4,000), or, if Maximus allows it, a pattern of underpayment on one code across patients (9792.5.12). More on IBR.

A worked example, start to finish

This is the bill from the EOR guide: a Sacramento orthopedic office, a knee injury, four lines, $593.50 underpaid.

The work that recovers this money is mostly clerical and almost entirely about deadlines: four lines, two forums, five clocks. It's also why most practices write it off.

OMFS maximums are base maximum fees under 8 CCR 9789.12.2 for an office (place of service 11) in the Sacramento locality, from the CMS RVU26B file and the $51.6091 conversion factor adopted in 8 CCR 9789.19(m) (DWC OMFS), computed by Redress's fee schedule engine. The visit, bill and carrier responses are illustrative.

Let someone else run the clocks

Redress reads every EOR, files the second reviews and PPO demands inside the window, takes the survivors to IBR, consolidating them where the rules allow, and collects the award. A licensed biller signs every filing, and you pay only a share of what we recover.

Last reviewed October 14, 2026. This guide is general information about California workers' compensation billing rules, not legal advice. Check the current statute and regulation before filing.