About
An independent read of a public record
California publishes every decision its Independent Medical Review process issues, and has since 2001. 42,621 of them are analysed here, sorted by what was denied, for which condition, and what the reviewer relied on. Nobody had turned that record into base rates by class. This is that.
Who publishes this
An independent research project, with no institutional backer.
It is not affiliated with, funded by, or endorsed by the California Department of Managed Health Care. It is not owned by, funded by or working for a health plan, a provider group, a law firm, or any of the services that draft appeal letters for a fee. There is no advisory board and no clinical staff, and this page is not going to imply otherwise.
What stands behind the figures instead is the method, published in full — including the parts of it that did not work.
Where the data comes from
statutoryWhen a California health plan refuses a treatment as not medically necessary or as experimental, the enrollee can ask the state for an Independent Medical Review. A physician who does not work for the plan decides, and the plan is bound by the result.
Those decisions are public because Health & Safety Code § 1374.33(g) requires the Department to publish them, and each one carries a written summary of the standards and evidence behind it because § 1374.33(h)(1)(K) requires that too. We did not obtain this record by asking nicely or by scraping anything: the state publishes it, and the same statute strips the health plan’s name from every decision before it appears.
What we tested, and what failed
the part most sites leave outReading reviewers’ reasoning by machine is the part that can quietly go wrong, so every category is scored against a 250-decision hand-read before it is used. The results, in full:
3
passed and are used
D2, D4, D6
11
failed and appear nowhere
C1, C2, C3, C5, C6, C7, D1, D3, D7, D8, D9
2
withdrawn on their own results
C4, D5
A category that failed is absent, not shown with a warning next to it. Every score, passed and failed, is on the methodology page, including the two rules we withdrew after the evidence showed they were measuring the wrong thing.
The rules we work under
No percentage below 30 cases
With fewer than 30 decisions a rate moves several points every time one case changes. Those groups show their decisions and no percentage. It is applied before we look at the numbers, not after.
No prediction about anyone's case
This describes what reviewers decided in groups of past disputes. It is not medical advice, not legal advice, and it cannot tell you what will happen to your appeal.
The same product to both sides, at the same price
Patients, provider appeal teams and health plans get identical figures on identical terms. A record that only serves one side stops being a record.
No health plan named against its reasoning
California removes the plan's name before publishing, so this cannot be built from the source at all — and we do not attempt to infer one. There are no insurer league tables here.
Nothing quoted that could identify a person
The reviewers' written decisions stay in our build database. What you see are counts and cited guidelines. Every one of those decisions is a real person's medical history.
Corrections in public, with a date
If a figure here is wrong, it gets fixed and logged where anyone can see it.
What this cannot tell you
read before citingEvery figure here counts denials that were appealed all the way to independent review. Fewer than 1% of denials are appealed internally at all, so “65.2% overturned” is not the share of denials that are wrong — it is the share of contested denials that reviewers did not sustain. It also covers California only, and only plans the state regulates: not self-funded employer plans, Medicare or Medicaid.
Contact
read by a personYou do not need us. The California DMHC Help Center files an Independent Medical Review at no cost — 1-888-466-2219, dmhc.ca.gov. It is the same review every figure on this site describes, and it is free whether or not you ever read a page here. How these numbers were made · corrections · licence and attribution · privacy.