Emergency Room denials: 46.5% overturned by independent reviewers
In 471 California IMR decisions from 2002 to 2025, reviewers overturned the plan 219 times (46.5%). In the last five years: 78.9% of 19. Denials reach IMR only when a member appeals all the way; read the caveats below before generalising.
By diagnosis
| Diagnosis category | Decisions | Overturned | Last 5 years |
|---|---|---|---|
| Orth/Musculoskeletal | 74 | 36.5% | 33.3% of 3 |
| Ears/Nose/Throat | 73 | 41.1% | — |
| Digestive System/ GI | 54 | 57.4% | 100.0% of 6 |
| Respiratory System | 42 | 38.1% | 50.0% of 2 |
| Skin Disorders | 35 | 25.7% | 100.0% of 1 |
| CNS/ Neuromusc Dis | 30 | 60.0% | 100.0% of 2 |
| GU/ Kidney Disorder | 24 | 58.3% | 50.0% of 2 |
| Trauma/ Injuries | 22 | 54.5% | 100.0% of 1 |
| OB-GYN/ Pregnancy | 20 | 40.0% | — |
| Cardiac/Circ Problem | 15 | 80.0% | 100.0% of 1 |
| Not Applicable | 13 | 53.8% | — |
| Mental Disorder | 11 | 36.4% | — |
| Infectious Disease | 11 | 63.6% | — |
| Vision | 11 | 45.5% | — |
| Pediatrics | 7 | 85.7% | — |
| Immuno Disorders | 6 | 33.3% | — |
| Cancer | 6 | 66.7% | — |
By year (last five)
| Year | Decisions | Overturned |
|---|---|---|
| 2021 | 2 | 0.0% |
| 2022 | 6 | 100.0% |
| 2023 | 2 | 100.0% |
| 2024 | 4 | 50.0% |
| 2025 | 5 | 100.0% |
What the findings mention
| What the findings mention | Decisions | Overturned | All decisions here |
|---|---|---|---|
| Urgent or emergencyThe findings mention urgency. | 467 | 46.5% | 46.5% |
| Records did not supportThe findings say the documentation did not show what was needed (usually an upheld denial). | 34 | 8.8% | 46.5% |
| Guidelines or criteria citedThe findings cite guidelines, criteria or a standard of care. | 10 | 10.0% | 46.5% |
| Published evidence citedThe findings refer to peer-reviewed or published evidence. | 8 | 87.5% | 46.5% |
Keyword matches on the reviewer’s findings, not causes. A tag that appears mostly in overturned decisions is worth documenting in an appeal; it is not a guarantee.
From recent overturned decisions
“The physician reviewer found that Nature of Statutory Criteria/Case Summary: A patient has requested reimbursement for medical services. In this case, the patient did not receive emergency medical services. However, the patient did receive urgent medical services. These services were necessary to prevent serious deterioration of the health of the patient, resulting from an unforeseen illness, injury, or complication of …”
“Nature of Statutory Criteria/Case Summary: A patient has requested reimbursement for emergency medical services after the patient was admitted for inpatient admission. Patients with colitis may be suffering from a range of etiologies including infectious colitis, neutropenic colitis, drug-induced colitis, and inflammatory bowel disease. Prompt diagnosis and management of acute colitis is essential to prevent severe complications and to provide …”
“Nature of Statutory Criteria/Case Summary: A patient has requested reimbursement for emergency medical services after the patient was admitted for inpatient admission. This patient presented to the emergency department with arm pain, swelling, and redness. While this complaint is common, multiple emergent causes are possible, including cellulitis, abscess, and osteomyelitis. Cellulitis can lead to life-threatening illnesses such as toxic shock …”
- 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 Emergency Room denials overturned?
In 471 California IMR decisions from 2002 to 2025, reviewers overturned the plan 219 times (46.5%). In the last five years: 78.9% of 19.
What did the reviewers' findings mention in overturned cases?
The table on this page counts keyword matches in the findings: prior therapies tried, contraindications, guidelines cited, published evidence, whether the records supported the request. They describe what the findings say, not why the case was decided.
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 the reasoning is the same kind: criteria, documentation and alternatives. Use the findings as a guide to what to document.
Related: California appeal rights · California external-review reversal rate · The levers library · CSV
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.