THE SHORT ANSWER
AmTrust’s own site lists several insurance companies. Two of them, Technology Insurance Company, Inc. and Wesco Insurance Company, hold California Department of Insurance licenses that include workers’ compensation. AmTrust’s claims page has an online tool that finds your adjuster from your claim number, and lists (844) 451-0750 for claims.
On this page
AmTrust is a group name. The policy itself is issued by one of the insurance companies in the group, and your letters, or the employer section of your DWCDWC Division of Workers’ Compensation, part of the Department of Industrial Relations. Administers the system. Information Services Center: 1-800-736-7401. 1, should name it. Below: which companies those are, what that means for your claim, how to find your adjusterClaims administrator / adjuster The person handling your claim for the insurer or self-insured employer., which doctors you may see, and what to do when nobody answers.
Who AmTrust is
A group of insurance companies. AmTrust’s insurance carriers page lists several. It describes one, Technology Insurance Company, as offering “mono-line workers’ compensation for small and mid-size businesses.”
Licensed in California. The California Department of Insurance lists Technology Insurance Company, Inc. and Wesco Insurance Company, both in the AmTrust Financial group, each with a license status of “Unlimited-Normal” and workers’ compensation among its lines of business.
Use the exact name on your letters. If they name a different company, write to that company by that name.
What that means for your claim
The AmTrust company is your employer’s insurer. The law lets an employer secure workers’ compensation by being insured by an insurer “duly authorized to write compensation insurance in this state.” The employer section of the DWC 1 names the insurer or claims administrator. The DWC 1, part by part
The deadlines are the Labor Code’s. The first temporary disabilityTD / TTD / TPD Temporary Disability, Total or Partial. Wage replacement while recovering. Two-thirds of average weekly earnings; 2026 maximum $1,764.11/week. payment within 14 days, up to $10,000 in treatment while the claim is decided, and the 90-day presumption apply to an AmTrust claim as to any other. Every deadline in one place
Finding your adjuster
Start with the claim number. It is on AmTrust’s letters to you. Put it on everything you send.
Look the adjuster up. AmTrust’s claims page says to use your claim number, with the date of loss, the date of injuryDate of injury For a cumulative or occupational disease claim, the law sets it as when you first suffered disability and knew or should have known it was work-related — not when the wear began. Almost every deadline runs off this. or the claimant’s date of birth, in its AmTrust Access tool to find your adjuster’s information.
AmTrust’s claims number. The same page lists (844) 451-0750 for reporting a workers’ compensation claim, and AmTrust’s home page lists it as its claims number.
Write to the claim. For correspondence on an existing claim, the claims page gives AmTrustClaims@amtrustgroup.com. A dated email, saying what you need and by when, is the record every remedy for delay depends on. My adjuster won’t call me back
Which doctors: the AmTrust California MPN
DWC’s list of active MPNs, current as of July 8, 2026, shows the AmTrust California MPNMPN Medical Provider Network. Your employer’s list of physicians. After the first visit you may switch within it without permission. (MPN ID 3154), filed by AmTrust North America, Inc. AmTrust’s home page links a California Medical Provider Directory.
Your MPN notice says which network applies. When an injury is reported, the employer or its insurer must give you a complete written MPN employee notification, with the MPN’s identification number, a toll-free Medical Access Assistant number, and the web address of its roster of treating physicians. Use the Medical Access Assistant number printed on that notice.
After the first visit you may switch to any other doctor in the network, without asking permission. How the MPN works
When nobody answers
Stop calling and write. Every remedy for delay depends on proof that you asked.
A late check is 10% more, automatically. A late indemnity payment is increased 10% and paid “without application.”
Unreasonable delay can cost more. The law allows up to 25% or up to $10,000, whichever is less, and the claim must be brought within two years of the date the payment was due. The 10% the law adds to a late check
The state’s help is free. Every DWC district office has an Information & Assistance officer who answers questions at no cost. Where the offices are
Frequently asked questions
My letters say Technology Insurance Company or Wesco. Is that AmTrust?
AmTrust’s carriers page lists both, and the Department of Insurance places both in the AmTrust Financial group.
How do I find my AmTrust adjuster?
Use your claim number in AmTrust Access, with your date of injury or date of birth, as AmTrust’s claims page describes. The claims number it lists is (844) 451-0750.
Does AmTrust have an MPN in California?
DWC’s active list shows the AmTrust California MPN. Your MPN notice tells you whether it is the network that applies to you.
Sources
- Labor Code § 3700
- § 4650
- § 5402· § 5814
- 8 CCR § 9767.12
- California Department of Insurance, company profiles: Technology Insurance Company, Inc.and
- Wesco Insurance Company
- DWC, Active Medical Provider Networks (as of July 8, 2026)
- AmTrust, Report a claim
- AmTrust, Insurance carriers
- AmTrust home page· § 4650(d) · Labor Code § 3700(a) · § 4650(a) · § 5402(c) · § 5402(b) · 8 CCR § 9767.12(a)
(213) 380-9310
General information about California law, not legal advice about your case.
Reviewed by Jamey Teitell, Partner & Trial Attorney · Last reviewed
Law Offices of Solov & Teitell, APC · (213) 380-9310
Printed from https://www.solovteitell.com/resources/claims-administrators/amtrust/ · Last reviewed