Of everything researched, this is the sharpest difference between the two systems — and it touches all three conditions: the trigeminal neuralgia, the post-crash recovery, and the osteoporosis.
Original Medicare has no prior authorization for outpatient physical therapy. None — not in any state, at any dollar amount, ever. And no visit limit.
The hard therapy caps were repealed in 2018. What remains are soft thresholds that trigger paperwork, not denials. Utilization is controlled entirely after the fact, through claim review — never by making you ask permission first.
| Original Medicare | Your UHC Group MA PPO | |
|---|---|---|
| Prior authorization | Never. None. | First 6 visits free, then full clinical review |
| Visit limit | None — no cap, no annual maximum | Effectively capped by each authorization block |
| What happens as costs add up | Past $2,480 the therapist adds a modifier attesting medical necessity; claims keep paying. Past $3,000 a claim may be selected for review afterward. | Re-authorization required, each time, indefinitely |
| Who decides necessity | The treating therapist and physician; review only after the fact | A plan reviewer applying proprietary criteria, before care |
| Choice of clinic | Any Medicare-certified provider, nationwide | Network-based |
| Cost with a supplement | $283 deductible, then essentially $0 regardless of visit count | Plan copay per visit |
The scale difference is worth seeing plainly: traditional Medicare completed roughly 625,000 prior authorization reviews in all of fiscal 2024, across every program combined. Medicare Advantage plans made 52.8 million determinations in the same period.
The APTA's November 2025 report on administrative burden found that 83% of physical therapists say prior authorization has caused patients to abandon treatment altogether, and 30% report waiting one to two weeks for each authorization. That is the mechanism by which a benefit that technically exists becomes one you can't actually use.
If therapy is ever denied or cut off because someone has "plateaued," is "not improving," or is "chronic and stable," that denial is contrary to a binding federal court settlement and should be appealed on exactly that basis.
Jimmo v. Sebelius (2013) required CMS to issue a corrective statement holding that coverage "does not turn on the presence or absence of a beneficiary's potential for improvement… but rather on the beneficiary's need for skilled care," and that "a beneficiary's lack of restoration potential cannot, in itself, serve as the basis for denying coverage." Maintenance therapy — to preserve function or slow deterioration — is covered.
This is the part that makes it enforceable here. Under 42 CFR 422.101(b)(6), Medicare Advantage plans may apply their own internal coverage criteria only where Medicare's coverage criteria are not fully established. Because Jimmo and the Medicare Benefit Policy Manual fully establish the maintenance-therapy standard, a plan may not substitute proprietary "improvement" criteria for it.
So an improvement-based denial isn't just wrong on the merits — it's arguably a regulatory violation. Say so, and cite the regulation by number.
The Center for Medicare Advocacy publishes, free, a Jimmo appeal letter template and a self-help packet for outpatient therapy denials. These are the best materials on this subject anywhere, and they're written to be used by patients rather than lawyers.
42 CFR 422.138 requires that approval of a prior authorization request for a course of treatment "must be valid for as long as medically reasonable and necessary to avoid disruptions in care." CMS adopted this specifically to stop plans from re-authorizing every two or three visits, which had been common practice.
If that's happening, it is arguably a regulatory violation rather than just an annoyance. Raise it in the appeal and in a complaint to Medicare at 1-800-633-4227.
This is where the gap between the two systems is largest and most measurable. Under Original Medicare, admission to an inpatient rehabilitation facility is a clinical decision between the hospital and the rehab physician — no insurer approval step exists. Under Medicare Advantage in 2024, according to the HHS Inspector General:
| Setting | Denial rate, all plans | UnitedHealth Group | Overturned on appeal |
|---|---|---|---|
| Long-term care hospital | 65% | 71% | 36% |
| Inpatient rehabilitation facility | 54% | 66% | 43% |
| Skilled nursing facility | 12% | 14% | 95% |
Inpatient rehab facilities must maintain a required share of patients with certain qualifying conditions in order to keep their designation — and "major multiple trauma" is on that list. A polytrauma patient after a crash is squarely someone rehab facilities want to admit. That makes a plan denial of inpatient rehab in this situation particularly contestable, and worth saying to the facility's admissions team as well as to the plan.
When a skilled nursing facility, home health agency, or rehab facility says services are ending, you get a Notice of Medicare Non-Coverage at least two days beforehand. That notice starts a clock.
Do not appeal this to UnitedHealthcare. Appeal it to the independent reviewer by noon the day before services are set to end. In Medicare Advantage this runs through the plan's independent review entity rather than the state quality organization, but the key protections are the same: the burden of proof is on the plan, not on you, and coverage continues while the appeal is pending.
For a hospital discharge, the equivalent is the Important Message from Medicare, and the Texas quality review organization is Acentra Health, 1-888-315-0636. Call them before leaving.
Under Original Medicare, home health has no prior authorization, no cost-sharing at all, and no duration limit as long as the coverage criteria are met — and Jimmo applies here too, so "not improving" is not a valid reason to end it. Under Medicare Advantage, 90% of enrollees are in plans requiring prior authorization for home health, and plans may impose cost-sharing that Original Medicare does not.
One useful detail: leaving home to receive health care — including regular therapy appointments — does not break "homebound" status. This is frequently misunderstood by patients and occasionally by staff.