Congress voted on prior auth twice this week — and took both sides on AI. But the most consequential number in the fight isn't in either bill. It's in KFF's data brief: of Medicare Advantage skilled-nursing denials that get appealed, 95% are overturned. Only 18% are appealed. Here's what that looks like as 100 denials, one dot each.
The denial is loud. The appeal is quiet. The money is in the quiet part.
12%
of SNF prior-auth requests denied
18%
of denials ever appealed
95%
of appealed denials overturned
4 in 5
likely-wrong denials never challenged
Watch it play out
100 skilled-nursing denials, one dot each
Every dot below is a Medicare Advantage prior-auth denial for a skilled-nursing-facility stay. Watch what happens when the KFF appeal and overturn rates run their course — then watch what the same overturn rate implies for the denials nobody challenged.
100 denials. A Medicare Advantage plan says no to 100 skilled-nursing stays. Every one of these can be appealed. Press play — or watch; it runs itself.
100
denied
0
appealed
0
overturned
0
never challenged
The ghost outlines are the story. Apply the same 95% overturn rate to the 82 unchallenged denials and roughly 78 more stays would likely have been approved — care that was denied, was probably deniable-in-error, and stayed denied because nobody said "check again."
Where the denials concentrate
Post-acute care is denied at rates the rest of medicine never sees
Same KFF brief: prior-auth denial rates for post-acute settings tower over the SNF rate that produced the dots above.
Long-term care hospital
65%
Inpatient rehab facility
54%
Skilled nursing facility
12%
Read the 95% carefully. It describes denials that were appealed — and the appeals that get filed are plausibly the strongest cases, filed by the most organized providers. Extrapolating 95% to the silent 82 gives an upper bound, not a measurement. The honest claim is narrower and still damning: the overturn rate on every appeal actually filed says the initial denials are wrong far more often than they're right — and 4 out of 5 of them are never tested at all.
The 80/20: this chart is a product spec wearing a policy costume. The tool that auto-triggers on a post-acute denial, assembles the medical-necessity packet, and files the appeal before the deadline attacks the 82 gray dots directly — and this week's votes (electronic-PA mandate advancing 42-0, an AI-denials bill aimed at MA) are its regulatory tailwind. Everyone is building submission tools. The leverage is in the appeal nobody files.