Practical Tips · The Demer Factors · Factor One · Discovery · July 2026
What the insurer paid its expert — and how often it had paid before — is the cheapest, most-discoverable proof of bias. In a bad-faith claim it isn’t private. It is evidence the investigation was built to deny.
When an insurer denies a claim on the strength of an expert’s report, the first question worth asking is not whether the expert was wrong. It is how much the insurer paid the expert, and how often it had paid that expert before. Financial dependence is where the bias inquiry begins, because it is the part of the inquiry that leaves a paper trail — more discoverable than the methodology, more concrete than a fight over credentials, and available at the start of the case rather than the end.
The companion explainer, The Two Metrics That Trigger the Burden-Shift, covers how to recognize financial-dependence bias. This page is about how to reach it — and how to get past the one case insurers cite to stop you.
An expert who depends on an insurer for a meaningful share of income has a reason to keep that income coming. The dollars paid are the direct measure of that dependence; where the dollars are hidden, the number of assignments times a typical fee gets to the same place. Standing alone, the money rarely proves bias outright. Its power is that it either shifts the burden onto the insurer to show its expert was impartial, or it opens the door to discovery of the harder-to-reach factors — the pattern-and-practice files from other insureds’ claims that show the expert’s outcome record, and the insurer’s own safeguards (or absence of them) — the categories buried deepest in the insurer’s cabinet. The compensation metrics are the wedge that pries them loose.
Insurers fight this discovery with a borrowed argument. In an ordinary lawsuit, an expert’s pay is offered to attack credibility — and courts are right to be cautious there, because contract and tort law impose no duty, express or implied, to hire an unbiased expert. Insurance is different. A first-party insurer owes its policyholder a duty to conduct a full and fair investigation before it denies a claim — the duty California recognized in Egan v. Mutual of Omaha. The same is true beyond first-party claims: the broader implied covenant of good faith and fair dealing obliges an insurer to exercise its discretionary powers — including the choice of who investigates — reasonably and in good faith. When the insurer hands that investigation to an expert who depends on its repeat business, the compensation is no longer a credibility sidebar. It is evidence the insurer breached the duty. (ERISA, which governs much of the disability world, has no comparable duty, no bad-faith cause of action, and no equivalent covenant — so an insurer’s stack of ERISA opinions refusing this discovery was decided under a far more constrained body of law.)
Insurers block this discovery with two privacy objections, usually raised together. The first is constitutional financial privacy, for which the case cited most is Valley Bank of Nevada v. Superior Court (1975). Read to its holding it is not a bar: the information “is discoverable in a proper case,” subject only to notice and a protective-order opportunity, with courts told to “impose partial limitations rather than outright denial of discovery.” The second is statutory — California’s Insurance Information and Privacy Protection Act — but the act carries its own exceptions (disclosure by subpoena or court order, and disclosure otherwise permitted by law), so the statute insurers wave is the one that authorizes the production. A related point is worth keeping straight: California’s tax returns carry their own, separately guarded statutory privilege, but the ordinary financial records that prove an expert’s income — invoices, payment statements, W-2s, 1099s — do not. Aim there, not at the return. The Brzezinski case study shows what happens when a claimant answers only one of the two.
There is a clock on this. The reputational side of the bias case — the data showing how often an expert’s opinions favor the insurer across many claims — is exactly what the industry is now seeking, through legislation in several states, to delete or de-identify. If that information disappears, compensation evidence stops being merely the first proof and becomes the primary proof. The checkbook may soon be the most durable record left.
Read the series → See the checklist → See the case study →
Recognize the bias in The Two Metrics That Trigger the Burden-Shift; work the discovery with Ten Moves Before You Ask What the Expert Was Paid; and see the mistakes to avoid in the Brzezinski case study.
Drawn from the project’s doctrinal synthesis of California and federal orders on expert-compensation discovery. Seminal authority — Egan v. Mutual of Omaha Ins. Co., 24 Cal.3d 809 (1979); Valley Bank of Nevada v. Superior Court, 15 Cal.3d 652 (1975); Demer v. IBM Corp. LTD Plan, 835 F.3d 893 (9th Cir. 2016). The implementing corpus is reserved for the subscriber series. Educational and informational only; not legal advice.