Denied as “experimental or investigational”
What it means
The insurer claims the treatment isn't proven — that it's still research-stage medicine and therefore excluded by your plan.
Why insurers use it
Plan definitions of “experimental” lag years behind clinical practice. A treatment can be FDA-approved, guideline-recommended, and routinely covered by other insurers and still be labeled experimental under one plan's outdated policy.
The counter-strategy
Document FDA approval status and on-label vs. off-label use for your indication.
Cite compendia listings and specialty-society guidelines that recognize the treatment.
Show other major insurers' published coverage policies for the same treatment.
External review is unusually strong here — independent physician reviewers apply current evidence, not the plan's policy.
In 10,476 published California external-review decisions on experimental / investigational denials, reviewers overturned the insurer 45.3% of the time. Source · See outcomes by treatment
Rights that apply to this denial
Your Medicare Advantage plan must give you a written decision when it denies a service or payment. Standard requests must be decided within …
You have 65 days from the date on your denial notice to ask the plan to reconsider. A different reviewer than the one who denied you must de…
If your plan upholds its denial, it must automatically forward your case to an Independent Review Entity — you don't have to ask. The IRE is…
If the IRE also says no and the amount in dispute meets the yearly threshold, you can request a hearing before an Administrative Law Judge w…
If your health plan comes through a private employer, federal law gives you at least 180 days to appeal a denial. The plan must review your …
You're entitled — free of charge — to every document the plan used to deny you: the criteria, the internal notes, the reviewer's specialty. …