Nerve Block for CNS/ Neuromusc Dis: 68.9% of denials overturned
In 103 California IMR decisions from 2010 to 2026, reviewers overturned 71 (68.9%). In the last five years: 80.3% of 61. 13 were medical-necessity disputes, 90 experimental/investigational.
By year (last five)
| Year | Decisions | Overturned |
|---|---|---|
| 2021 | 6 | 66.7% |
| 2022 | 12 | 50.0% |
| 2023 | 11 | 81.8% |
| 2024 | 18 | 100.0% |
| 2025 | 13 | 84.6% |
| 2026 | 1 | 100.0% |
What the findings mention
| What the findings mention | Decisions | Overturned | All decisions here |
|---|---|---|---|
| Published evidence citedThe findings refer to peer-reviewed or published evidence. | 55 | 72.7% | 68.9% |
| Prior therapies failedThe findings mention treatments that were tried without adequate response. | 34 | 94.1% | 68.9% |
| Records did not supportThe findings say the documentation did not show what was needed (usually an upheld denial). | 8 | 0.0% | 68.9% |
| Guidelines or criteria citedThe findings cite guidelines, criteria or a standard of care. | 7 | 71.4% | 68.9% |
| Experimental or investigationalThe findings discuss whether the treatment is experimental. | 5 | 20.0% | 68.9% |
| Urgent or emergencyThe findings mention urgency. | 4 | 50.0% | 68.9% |
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 a patient has requested reimbursement for greater occipital nerve block. The patient met the clinical criteria for primary headache disorder, had migraines, and had failed multiple medications and other treatments. The patient previously demonstrated improvement with an occipital nerve block. Published literature notes that occipital nerve blocks are often considered first‑line treatment and may serve …”
“The physician reviewer found that a patient has requested reimbursement for an anesthetic and/or steroid into the greater occipital nerve.The patient was noted to have a history of cervicogenic headache, temporomandibular joint dysfunction (TMD), cervical spine disease, and bilateral eustachian tube dysfunction. The patient has received treatment with prior procedures, acupuncture, and physical therapy. The patient underwent an injection of …”
“The physician reviewer found that Nature of Statutory Criteria/Case Summary: A patient has requested authorization and coverage for occipital nerve block therapy and/or SPRINT implantable peripheral nerve stimulation (PNS) device. Occipital neuralgia is a debilitating pain condition that can be refractory to several treatment methods. Evidence supports occipital nerve blocks as a preventive and effective treatment for chronic migraines. According …”
And one the reviewer upheld
“The physician reviewer found that Nature of Statutory Criteria/Case Summary:A patient has requested authorization and coverage for diagnostic nerve blocks and related procedures for the evaluation and treatment of facial pain. Standard management of trigeminal neuralgia typically begins with pharmacologic therapy, with procedural or surgical interventions reserved for refractory cases. While various interventional approaches exist, current medical literature supports specific …”
- 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 Nerve Block denials for CNS/ Neuromusc Dis overturned?
In 103 California IMR decisions from 2010 to 2026, reviewers overturned 71 (68.9%). In the last five years: 80.3% of 61. 13 were medical-necessity disputes, 90 experimental/investigational.
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.