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How Do You Dispute a Workers Comp Underpayment?

Check the payment against your state's workers' compensation fee schedule, read the explanation of review for the carrier's reason, then file the state's dispute step before its deadline. The deadlines are short and they differ by state: in California a provider has 90 days to ask for a second review, and in Florida a provider has 45 days to petition the state.

Written by Salman Saeed, CEO and Co-Founder · Reviewed by a Certified Medical Coder ·
Billing specialist comparing a workers' compensation explanation of review with the state fee schedule on a desk
The state's dispute clock starts on the explanation of review, not on the day someone reads it.

In short: a workers' comp underpayment is disputed in the state's own process, not through a commercial appeal. Recalculate the expected payment from the fee schedule, ask the carrier to review its own payment first where the state requires it, and take the amount to the state's bill review step only if the carrier does not correct it. Put the deadline on the calendar the day the explanation of review arrives.

What Counts as a Workers' Comp Underpayment?

It is a payment below the amount the state fee schedule, or a contract that the state allows in place of it, says the bill is worth. In California the regulations define the "amount of payment" in dispute as payment for services that have an adopted fee schedule or a contract for reimbursement rates under Labor Code section 5307.11 (8 CCR 9792.5.4(a)). In Florida, payment to a provider is subject to the medical fee schedule, and fees may not exceed the schedule unless the provider has agreed in writing to identified procedures (section 440.13).

A denial because the carrier says the injury is not work related is a different fight. California states that issues of contested liability must be resolved before independent bill review (9792.5.7(b)). Sort the two before you choose a path. The workers' comp and no-fault billing service page covers the basics of who pays first.

What Do You Check Before Disputing?

1
Find the Fee Schedule Amount
Price each line from the state schedule that was in force on the date of service: code, modifier, units and any facility or geographic factor the schedule uses. California's physician fee schedule for services on or after January 1, 2014 sits in sections 9789.12.1 to 9789.19.1.
2
Read the Explanation of Review Line by Line
The carrier's explanation gives the reason for each reduction. Match each reason to a line. A reduction with no reason is itself something to raise.
3
Check for a Contract or Agreement
If you signed a rate agreement with the carrier or its network, the contract rate may replace the schedule. Know which one applies before you quote either.
4
Confirm the Bill Was Complete and on Time
California requires medical bills within 12 months of the date of service, and an uncontested bill is payable within 45 days of receipt. A carrier that contests, denies or calls a bill incomplete must tell you within 30 days.
5
Calculate the Shortfall in One Line
Expected amount minus amount paid. If the shortfall is smaller than what the dispute will cost in staff time and fees, record it and move on.

How Does the California Dispute Process Work?

California has two steps in order. The first is a second review by the carrier, and the second is independent bill review. You cannot skip to the second.

StepDeadlineWhat to send
Second review requestWithin 90 days of the date of service of the explanation of review (8 CCR 9792.5.5(b))The same bill and itemized services, marked with NUBC condition code qualifier BG and condition code W3, or DWC Form SBR-1. Include the explanation of review date, claim number, items and amounts in dispute, and the additional payment requested with the reason.
Carrier response14 days from receipt of a compliant request (9792.5.5(g))A written determination on each disputed item.
Payment of any balance owedWithin 21 days of receipt of the request (9792.5.5(h))Payment of any amount no longer in dispute or found payable.
Independent bill reviewWithin 30 calendar days of the carrier's final written determination (9792.5.7(c))The IBR request form with the fee, plus the original bill, supporting documents, the first explanation of review, your second review request and the carrier's second review determination.

Two rules catch offices out. A second review may not add new dates of service or new billing codes (9792.5.5(d)). And if the only dispute is the amount and you do not request a second review in time, the bill is deemed satisfied and nobody owes anything further (9792.5.5(e)). An IBR request covers one provider, one injured worker, one carrier and either one date of service and code or one hospital stay, unless disputes are consolidated, and the regulation text sets a fee per request, so check the current form before you file small items.

How Does the Florida Dispute Process Work?

Florida runs through a petition to the state. Under section 440.13(7), a provider who contests a carrier's disallowance or adjustment must petition the Department of Financial Services within 45 days after receiving notice of the disallowance or adjustment.

  • Serve a copy of the petition on the carrier and all affected parties by certified mail.
  • Attach every document that supports the petition. A petition without them is dismissed.
  • The carrier has 30 days after receiving the petition to send its documents. If it does not, it waives all objections.
  • The department issues a written determination within 120 days after it receives all the documentation.
  • If the department finds an improper disallowance or adjustment, the carrier must reimburse within 30 days.

A carrier that shows a pattern of arbitrarily or unreasonably reducing payments can face repayment, a fine of up to $5,000 per instance and an award of the provider's costs, including a reasonable attorney fee (440.13(7)(f)).

What If the Claim Is in Another State?

Look up the workers' compensation agency's medical dispute rules before the first denial arrives, not after. The step names, the clock and the form differ by state, and some clocks run from the date the carrier serves its response rather than the date you read it. California counts from the date of service of the explanation of review, and presumes five calendar days after the postmark when there is no proof of service. Until you have confirmed the state's process from its agency, treat the shortest deadline you can find as the working deadline.

What Do the Dates and Dollars Look Like?

Example: Made-Up California Short Payment

The explanation of review was served on Wednesday, March 3, 2027 with a proof of service. The fee schedule amount and payment are invented. Dates are counted in calendar days.

Fee schedule amount for the line$212.40
Carrier payment$150.00
Shortfall to request$212.40 minus $150.00 = $62.40
Last day to request second review (90 days)Tuesday, June 1, 2027
Request received June 1: carrier response due (14 days)Tuesday, June 15, 2027
Payment due if owed (21 days from receipt)Tuesday, June 22, 2027
If the determination is served June 15: IBR request due (30 calendar days)Thursday, July 15, 2027

Send the request well before day 90, with proof of the date it left your office. Whether a $62.40 gap justifies an IBR fee is a business decision. Batch recurring short payments from the same carrier so one pattern is worth the effort.

What Goes in the Dispute Package?

  1. The bill as first submitted and proof of the submission date.
  2. The explanation of review, with its service date or postmark.
  3. Your fee schedule calculation, one line per disputed code, naming the schedule section and edition.
  4. The contract page, if a rate agreement applies.
  5. A short cover note that states the amount requested and the reason, in the order the explanation lists the reductions.

Keep it factual. The same structure works for a commercial appeal, and the claim appeal letter post shows the wording. The method for spotting short pays across many claims is in finding payer underpayments against your contract.

How Does Nucleus Align Handle Workers' Comp Underpayments?

Workers' comp and no-fault billing is one of our services, and we work denials within 48 hours. Urgent care billing clients see these cases most often, especially from employer and occupational visits. More explainers are on the blog, or book a call.

Sources
  1. 8 CCR 9792.5.5, Second Review of Medical Treatment Bill · California Department of Industrial Relations
  2. 8 CCR 9792.5.7, Requesting Independent Bill Review · California Department of Industrial Relations
  3. 8 CCR 9792.5.4, Second Review and Independent Bill Review Definitions · California Department of Industrial Relations
  4. Standardized paper billing FAQs, California DWC · California Department of Industrial Relations
  5. Florida Statutes section 440.13, Medical services and supplies · The Florida Senate

We check every rule, code and deadline against the official source. See our editorial policy.

Written by Salman Saeed, CEO and Co-Founder
Reviewed by a Certified Medical Coder. Our editorial policy explains how every article is checked.
FAQ

Common Questions

Straight answers from the team that does the work.

Still have a question?

Ask a billing lead directly. A 20-minute call, Monday to Friday, 9am to 5pm Eastern.

01How long do I have to dispute a workers comp underpayment?

It depends on the state. In California you have 90 days from the date of service of the explanation of review to request a second review. In Florida you have 45 days after receiving notice of the disallowance or adjustment to petition the state. Confirm your own state's clock with its workers' compensation agency.

02What is a second review in California workers comp billing?

It is a request that the carrier re-examine its own payment on a bill. It must be filed within 90 days of the explanation of review, uses the same dates of service and codes, and is marked with condition code W3 or DWC Form SBR-1. The carrier answers within 14 days.

03What is independent bill review?

In California it is the step after second review, for disputes over the amount of payment only. Request it within 30 calendar days of the carrier's final written determination, with the required fee and the listed documents. Liability disputes must be resolved first.

04What happens if I miss the dispute deadline?

In California, if the only dispute is the amount of payment and you miss the second review window, the bill is deemed satisfied and no further payment is owed. In Florida, a late petition is outside the 45-day window in section 440.13(7).

05Can I dispute a payment that the carrier denied for liability?

A liability denial is handled separately from an amount dispute. California requires issues of contested liability to be resolved before independent bill review, so work the liability issue through the claim first, with the carrier and the state process for that question, and return to the payment dispute afterward.

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