OON Referral for Cancer: 41.4% of denials overturned
In 29 California IMR decisions from 2002 to 2025, reviewers overturned 12 (41.4%). In the last five years: 50.0% of 4. 26 were medical-necessity disputes, 2 experimental/investigational, 1 urgent care.
By year (last five)
| Year | Decisions | Overturned |
|---|---|---|
| 2021 | 2 | 50.0% |
| 2023 | 1 | 0.0% |
| 2025 | 1 | 100.0% |
What the findings mention
From recent overturned decisions
“The physician reviewer found that a patient has requested authorization and coverage for a tertiary level of care for a bilateral mastectomy with immediate reconstruction (bilateral deep flap reconstruction). Medical literature notes that bilateral deep inferior epigastric perforator flap reconstruction is associated with higher procedural complexity and increased risk of complications compared to unilateral procedures. The procedure in this case …”
“Nature of Statutory Criteria/Case Summary: The patient has requested authorization and coverage for a tertiary level of care esophagogastroduodenoscopy procedure. Sheikh and colleagues note that duodenal neuroendocrine tumors are rare. Dewan and colleagues report that most cases of neuroendocrine carcinoma in the duodenum show rapid progression of the disease. Sato and colleagues explain that therapy for duodenal neuroendocrine tumors is …”
“Nature of Statutory Criteria/Case Summary: An enrollee has requested reimbursement for the office visit and related services required on an emergent or urgent basis. Findings: The physician reviewer found that the patient presented with a concern for a recurrence of testicular cancer. The physical examination did not demonstrate a palpable mass. Moreover, an ultrasound is not indicated in the setting …”
And one the reviewer upheld
“Nature of Statutory Criteria/Case Summary: The patient has requested authorization and coverage for follow-up oncology care with a tertiary facility. Findings: The physician reviewer found that the records provided for review document that this patient has an uncomplicated stage I invasive breast cancer. The patient’s prior breast surgery was performed at a tertiary cancer center. The patient had a follow-up …”
- California only: these are decisions by independent reviewers under California's IMR program (plans regulated by the Department of Managed Health Care). Other states and self-funded employer plans use different reviewers and rules.
- Selection: only denials that a member took all the way to IMR appear. Most denials are never appealed, and the ones that reach an external reviewer are not a random sample.
- Overturned means the reviewer disagreed with the plan; it does not mean the treatment worked or that a similar request will be approved.
- Argument tags are keyword matches on the reviewer's findings. They describe what the findings mention, not why the case was decided.
- Categories are DMHC's own labels (treatment sub-category and diagnosis category); 'Other' is a catch-all and is excluded from rankings.
Source: California Department of Managed Health Care, Independent Medical Review (IMR) Determinations, Trend (CHHS Open Data). Public California government data; Apellica's aggregates and tags are CC BY 4.0.
Questions
How often were OON Referral denials for Cancer overturned?
In 29 California IMR decisions from 2002 to 2025, reviewers overturned 12 (41.4%). In the last five years: 50.0% of 4. 26 were medical-necessity disputes, 2 experimental/investigational, 1 urgent care.
What should an appeal document, based on these findings?
Whatever the plan's criteria ask for, shown in the record: the treatments already tried and their results, contraindications to the plan's preferred option, the guideline or evidence that supports the request, and the treating clinician's reasoning written to the criteria. The tag table shows which of these the reviewers mentioned most in overturned cases.
Does a California IMR result apply to my plan?
Only California plans regulated by the Department of Managed Health Care go to IMR. Other states and self-funded employer plans use different reviewers, but they weigh the same things.
Independent reviewers reverse plans when the record answers the criteria. Upload the denial letter; a senior reviewer reads it within 24 hours and tells you in writing whether it can be appealed and how. $0 upfront, 10% of what is recovered, nothing if we do not recover. Not a law firm.