California Workers’ Comp Claim on Delay: What the 90-Day Investigation Period Means

Review the primary official source.

Day Zero: Filing the DWC-1 and Proving Delivery

A claim can be under investigation while medical treatment is needed now. The investigation period is not a blanket instruction to wait for care. First separate the date the DWC 1 was filed, the request for treatment and the administrator’s response. They answer different questions.

The DWC filing guide explains that an employer must give or mail a claim form within one working day after learning of the work injury or illness. That obligation is addressed by Labor Code section 5401. The compensability presumption under section 5402 instead turns on filing the claim form. An incident report or first medical visit is not necessarily that event.

For most claims, section 5402(b)(1) uses 90 days after filing. Subdivision (b)(2) uses 75 days for the specified injuries and illnesses defined in sections 3212–3212.85 and 3212.9–3213.2. Do not apply the headline’s 90-day shorthand to every claim. Confirm the applicable category and trigger before relying on a deadline calculation.

Keep the completed employee section and proof of delivery. DWC recommends certified mail with return receipt when mailing the form. Ask for the employer’s completed copy too. A dispute about delivery needs the document and receipt, rather than a reconstructed date from memory. Our California workers’ compensation practice page provides the broader overview.

The Delay Letter and Provisional Medical Treatment

A delay notice says that liability is still being investigated; it is not an acceptance or denial. Under the DWC benefit-notice rule, section 9812(g), the notice must explain the reason, additional information needed and expected determination date. Keep any later notice changing that explanation or date.

Section 5402(c) requires authorization, within one working day after the claim form is filed, for treatment consistent with the applicable treatment guidelines for the alleged injury. The obligation continues until acceptance or rejection, with liability for this provisional treatment limited to $10,000. This is a medical-treatment limit, not a $10,000 check payable to the worker, a promise to authorize every requested service or a final limit on an accepted claim.

If a clinic says it cannot schedule because the claim is “on delay,” ask what is missing: The administrator’s authorization, a doctor’s treatment request, a network referral or a decision on a specific service? Keep the answer in writing. A general liability delay and a decision on medical necessity are different issues; the complete notice determines which process needs review.

• Requested care: Identify the service, ordering clinician and date of the request.
• Authorization: Keep the response, approved provider, number of visits and any stated conditions.
• Care actually supplied: Record visit dates, services and related invoices or payment explanations.
• Unresolved care: Identify the particular service still awaiting an answer, rather than assuming every appointment has the same status.

For example, approval for an initial examination does not answer whether a later therapy course has been authorized. Nor does a clinic’s estimate show how much the administrator has treated as provisional medical liability. Ask for an explanation of the services and amounts counted if the $10,000 limit is raised. Do not spend an assumed “remaining balance” as though it were an individual care allowance.

What Happens During the 90-Day Investigation

While the administrator investigates causation and coverage, keep the medical-access question moving separately. Tell the treating office which claim is being investigated and give it the correct administrator information. If an appointment is cancelled, preserve who cancelled it, why and what follow-up was requested. This helps distinguish an unanswered authorization from a scheduling problem or a disputed treatment recommendation.

Use one short care note for each unresolved request: “The doctor requested [service] on [date]. The clinic says [specific obstacle]. Please identify the authorization or decision and who should arrange the next appointment.” Attach the actual request and response. This is an inquiry to clarify care, not a substitute for a required review form, hearing request or filing deadline.

An investigation may also involve medical records, a statement or a medical-legal evaluation. Read the actual notice and ask what procedure it invokes. Do not assume the insurer may simply choose any examining doctor for an “IME.” Section 9812(g) provides specific QME-panel information for unrepresented workers when the stated conditions apply. If represented, discuss the notice with counsel. Our QME and AME preparation guide addresses the worker’s personal history and examination preparation.

Keep work restrictions and wage-loss notices beside, but separate from, the treatment file. An authorization to see a doctor does not by itself decide temporary disability payments. Likewise, a payment question does not tell the clinic whether a particular service was approved.

After Day 90: Acceptance, Denial, and Your Next Steps

If liability is not rejected within the applicable 90- or 75-day period, section 5402 establishes a presumption that the injury is compensable. The statute permits rebuttal only with evidence discovered after that period. Whether evidence qualifies and whether the clock was triggered can require legal review. The presumption does not itself calculate disability periods, wages or every requested benefit.

When the decision arrives, compare it with the care already requested. An acceptance may leave a particular condition or treatment issue disputed. A denial does not erase the earlier provisional-care obligation: Section 9812(i)(3) directs the administrator to advise the worker to submit bills for qualifying services provided between filing the completed claim form and rejection, subject to the $10,000 maximum.

Make the handoff specific: Which appointments remain scheduled? Which authorizations are outstanding? Which pre-denial bills have not been addressed? What does the actual decision say about further care? Do not assume all post-denial outside treatment will be reimbursed, or that a pending dispute permits abandoning urgent medical needs. Obtain prompt guidance on both medical access and the legal challenge.

For a consultation, bring the DWC 1 and receipt, all delay and decision notices, the doctor’s outstanding request and the clinic’s explanation of the obstacle. That lets counsel assess the investigation period and the immediate care problem together. Our claim deadlines and denial guide explains the separate adjudication route. Contacting the firm does not file that challenge or extend a deadline.