An adjudication number is a unique case identifier assigned by a state’s workers' compensation board—most notably the California Division of Workers' Compensation (DWC)—once an official Application for Adjudication of Claim is filed. It serves as the permanent tracking number for all legal proceedings, hearings, and court filings associated with a specific workplace injury case.
In the complex landscape of workers' compensation, documentation is the cornerstone of a successful claim. While many injured workers are familiar with their insurance claim number, the adjudication number (often abbreviated as the ADJ number) represents a shift from a private administrative process to a formal legal matter. As of 2026, the adjudication number remains the primary key for accessing the Electronic Adjudication Management System (EAMS), which is the digital infrastructure used to manage workers' compensation cases in jurisdictions like California. Understanding how to locate, use, and protect this number is essential for injured workers, medical providers, and legal representatives alike.
The Distinction Between Claim Numbers and Adjudication Numbers
One of the most frequent points of confusion for individuals navigating the workers' compensation system is the difference between an insurance claim number and an adjudication number. These two identifiers serve distinct roles and originate from different entities.
Insurance Claim Numbers
When an employee reports an injury to their employer, the employer notifies their workers' compensation insurance carrier. The carrier then assigns an internal "claim number." This number is used for administrative tasks such as processing medical bills, issuing temporary disability checks, and internal record-keeping. The insurance claim number is a private identifier used between the worker, the employer, and the insurance company.
Adjudication (ADJ) Numbers
An adjudication number is only generated when a case enters the state’s legal system. This typically happens when a party—either the injured worker or the insurance company—files an "Application for Adjudication of Claim" with the state’s workers' compensation appeals board. In California, this number is assigned by the DWC and starts with the prefix "ADJ," followed by a series of digits (e.g., ADJ1234567). Unlike the insurance claim number, the ADJ number is a matter of public record and is required for all formal court interactions, including filing liens, requesting hearings, or submitting mandatory settlement documents.
How to Obtain an Adjudication Number
An adjudication number does not exist the moment an injury occurs. It is created only through a formal filing process. If you are currently receiving benefits but have never been to court or filed a formal application with the state board, you likely do not have an ADJ number yet.
Filing the Application for Adjudication of Claim
To obtain an ADJ number, an injured worker (or their attorney) must file an Application for Adjudication of Claim at the district office of the Workers' Compensation Appeals Board (WCAB) in the county where the worker resides or where the injury occurred. This document officially opens a case file with the state. Once the DWC processes the application, they will mail a notice to all parties involved—the worker, the employer, and the insurance carrier—listing the newly assigned ADJ number.
Using the EAMS Public Search Tool
For cases that have already been filed, the adjudication number can be retrieved through public databases. In California, the EAMS public search tool allows users to search by the injured worker’s name and date of birth or date of injury. As of 2026, these digital portals have become more streamlined, providing real-time access to case numbers. It is important to note that if a case was filed many years ago, it might have a "Legacy Number" (an older format), but the EAMS system has mapped these to modern ADJ numbers for consistency.
Contacting an Information and Assistance Officer
If you are an unrepresented worker (meaning you do not have an attorney), the state provides Information and Assistance (I&A) officers. These individuals are employees of the DWC who help workers navigate the system. An I&A officer can look up your case details and provide your ADJ number if an application has already been filed. They can also provide the necessary forms to file an application if one does not yet exist.
Why the Adjudication Number is Essential in 2026
The adjudication number is more than just a tracking ID; it is a functional requirement for nearly every legal step in a workers' compensation case. Without it, the "gears" of the state's legal machinery cannot turn for your specific claim.
Legal Filings and Documentation
Every document submitted to the court must feature the ADJ number prominently. This includes petitions for medical evaluations, declarations of readiness to proceed to a hearing, and settlement agreements like a "Compromise and Release." Because the EAMS system uses Optical Character Recognition (OCR) to sort and file thousands of documents daily, an incorrect or missing ADJ number can lead to a document being rejected or "lost" in the system, causing significant delays in benefits.
Medical Provider Liens and Billing
Medical providers use the ADJ number to file liens if the insurance company refuses to pay for authorized treatment. In 2026, the integration between medical billing software and state adjudication systems requires the ADJ number to link medical evidence to the correct legal case. If a doctor cannot find an ADJ number, they may be unable to file the necessary paperwork to get paid, which can sometimes lead to friction in the doctor-patient relationship.
Accessing Case Status and History
The ADJ number allows parties to view the "Case Summary" or "Log," which details every action taken in the case. This includes when a judge was assigned, when hearings were held, and which documents have been officially filed. For workers, this transparency is vital to ensure their attorney or the insurance company is moving the case forward as expected.
Comparison: Claim Identifiers in Workers' Compensation
To better understand where the adjudication number fits, the following table compares the most common identifiers used throughout a claim's lifecycle.
| Identifier | Issued By | Visibility | Primary Use |
|---|---|---|---|
| Insurance Claim Number | Insurance Carrier (e.g., State Fund, Travelers) | Private | Medical billing, disability check issuance, and adjuster communication. |
| Adjudication (ADJ) Number | State DWC / WCAB | Public Record | All court filings, hearings, trials, and legal settlements. |
| Social Security Number | Social Security Administration | Highly Private | Used for initial identification; usually masked or replaced by ADJ in court records for privacy. |
| UAN (Uniform Assigned Name) | State DWC | Registry List | Used specifically to identify the law firms and insurance companies involved in a case. |
Common Troubleshooting with ADJ Numbers
Despite being a standardized system, issues frequently arise regarding adjudication numbers. Managing these problems early can prevent long-term complications in a claim.
The "Multiple Case" Problem
If a worker has had multiple workplace injuries over several years, they will have a unique ADJ number for each specific date of injury. A common mistake is filing a document for a 2026 back injury using the ADJ number from a 2022 knee injury. This results in the document being filed in the wrong "jacket," and the judge presiding over the current case will never see it. Always verify that the ADJ number matches the specific date of injury relevant to the filing.
Missing ADJ Numbers for Medical-Legal Evaluations
When a worker is sent to a Qualified Medical Evaluator (QME), the doctor must include the ADJ number on their report. If the number is missing because an application hasn't been filed yet, the doctor may use "None" or "Pending." However, once a number is assigned, it is the responsibility of the parties to update the doctor so that future supplemental reports are correctly indexed.
Privacy and the Public Record
Because ADJ numbers are part of the public record, anyone with your name and date of injury can technically look up your case status. While specific medical records are kept confidential and are not viewable by the general public, the "fact" of the litigation (dates of hearings, names of parties) is accessible. Workers concerned about privacy should discuss with their counsel how their information is presented in public-facing EAMS summaries.
Frequently Asked Questions
Can I have a workers' compensation claim without an adjudication number?
Yes. Many claims are "non-litigated," meaning the insurance company pays for medical care and disability benefits without the need for court intervention. In these instances, you will only have an insurance claim number. You only receive an ADJ number if someone files a formal application with the state board to preserve legal rights or resolve a dispute.
What should I do if I lose my adjudication number?
You can retrieve it by using the California DWC EAMS Search portal. You will need to enter your first name, last name, and either your date of birth or the date of the injury. If the search returns no results and you are certain a case was filed, contact your attorney or an Information and Assistance officer at the local WCAB district office.
Does an adjudication number expire?
The number itself does not expire, but the case it represents can become "inactive" or be "dismissed" if there is no activity for several years. Even if a case is settled, the ADJ number remains the permanent historical record of that specific legal matter. If you sustain a new injury at a later date, you will be assigned a completely new ADJ number.
Why does my attorney keep asking for the ADJ number if they filed the case?
While law firms usually have this on file, they may ask for it to verify they are looking at the correct file among multiple injuries, or to ensure that a newly assigned "Consolidated" number hasn't replaced a previous one. In complex cases involving multiple body parts or employers, cases are often "joined," and one ADJ number may become the "Master" number for all future filings.
Can a medical provider refuse treatment without an ADJ number?
Legally, no. Treatment is based on the insurance claim's validity. However, as of 2026, many providers prefer to have the ADJ number on file because it ensures they have a legal path to payment (via a lien) if the insurance company later denies the claim. Providing the ADJ number to your doctor helps ensure a smoother administrative process for your medical care.
Final Recommendation for Injured Workers
If you are involved in a workers' compensation claim that involves any level of dispute—such as a denial of surgery, a disagreement over your disability rating, or a delay in payments—your first priority should be to ensure an Application for Adjudication of Claim has been filed. Once filed, secure your adjudication number and keep it in a dedicated file alongside your insurance claim number. Use this ADJ number in every communication with the court and ensure your medical providers have it. Having this number readily available is the most effective way to prevent administrative delays and ensure that your case remains visible and active within the state's judicial system.
