Institutional mechanics · checked
Who decides whether your MRI gets approved?
The 60-second answer
A utilisation-review process inside your health plan, applying the plan’s own medical-necessity criteria. On a medical-necessity denial in California a licensed reviewer with appropriate expertise must make the determination — but an automated system may be involved before that point, and no rule requires you to be told it was.
How the system works
Your physician submits a request with clinical documentation. The plan checks it against internal criteria, which may be licensed from a vendor or built in-house and are frequently not public. Simple approvals can be automatic. Anything ambiguous escalates. A denial can be appealed internally, then externally.
Who controls the decision
The plan sets the criteria, and the criteria decide most cases. That is the part patients and physicians consistently underestimate: the reviewer is applying a rule someone else wrote, and the rule is where the real decision was made.
Where it fails
Delay is the common harm rather than outright refusal — an approval that arrives three weeks late has already changed the clinical situation. Automated involvement is not disclosed. And a physician who appeals successfully receives no signal that the underlying criterion was wrong, so the same denial recurs for the next patient.
The governing law
California sets response timeframes and the licensed-reviewer requirement for medical-necessity denials. Federal rules impose decision timelines on certain plans. Neither fixes how long an approval lasts nor bars automation from producing a final denial.
What physicians experience
Unpaid administrative work per patient, repeated at each renewal, with no mechanism to fix a criterion that is generating wrong answers.
What patients experience
A test your physician thinks you need, waiting on a determination you cannot see the criteria for.
Where to read the detail
This explainer synthesises analysis published elsewhere on this site; it introduces no fact that is not on one of the pages above. Registry: data/how-medicine-works.json.