Half Your Medicare Patients Now Play by Different Rules. Most DME Suppliers Are Still Billing Them the Same Way.
Medicare Advantage plans now cover more than half of all Medicare beneficiaries. They set their own prior authorization requirements, their own coverage criteria, and their own denial logic. They are not bound by CMS coverage rules. And most DME billing teams still treat them like traditional Medicare.
MA plan enrollment hit 54% of Medicare beneficiaries in 2025 and is still growing. For most DME suppliers, that means the majority of your Medicare volume is now billed to plans that operate under their own coverage policies, not CMS's. The prior authorization rules are different. The clinical criteria are different. And the denial behavior is different, typically worse.
When your patient's plan changed, the coverage rules changed with it
Traditional Medicare (Parts A and B) operates under coverage rules published by CMS and administered by Medicare Administrative Contractors. Local Coverage Determinations tell you what clinical evidence the notes must show. Coverage is standardized across the country, with regional variation only at the MAC level.
Medicare Advantage plans don't work that way. CMS sets minimum coverage standards (MA plans must cover what traditional Medicare covers), but above that floor, each plan writes its own policies. An MA plan can require prior authorization for HCPCS codes that Medicare FFS doesn't. It can require clinical documentation that goes beyond what the applicable LCD asks for. It can deny a claim on clinical grounds that Medicare FFS would have approved. And different plans within the same insurer's portfolio can behave completely differently for the same equipment code.
Most DME suppliers know this in the abstract. Fewer have actually changed how they handle MA claims at intake.
An MA plan can require prior authorization for codes that Medicare never touches, and deny claims on clinical grounds that Medicare would have approved. That's not an exception. It's how the program was designed.
What MA plans can require that CMS can't, and what they often do
The list of things MA plans routinely impose on DME claims that Medicare FFS doesn't require is not short. The most consequential ones, in practice:
| Requirement type | Traditional Medicare (FFS) | Common MA plan behavior | Supplier exposure |
|---|---|---|---|
| Prior authorization | Required for a defined list of high-cost codes (power wheelchairs, certain O2 equipment) | Required for a much broader list, often including CPAP, standard wheelchairs, and wound care supplies that Medicare FFS doesn't require PA for | High |
| Clinical documentation thresholds | Defined by the applicable LCD and published publicly by the MAC | Set in the plan's own coverage policy, which may be stricter than the LCD and may not be publicly accessible in full | High |
| Step therapy / trials | Not typically required for DME; LCD may require documentation of conservative care failure | Some plans require documented failure of a lower tier of equipment before approving higher-cost devices | Moderate |
| In-network supplier requirement | Any Medicare-enrolled supplier can bill | MA plans with narrowed networks may deny claims from out-of-network suppliers entirely, or pay at a sharply reduced rate | High |
| Formulary / covered items list | CMS DMEPOS benefit covers a defined set of equipment categories | Plans can limit covered brands, types, or configurations within a category. A covered item under Medicare may still be non-covered under a specific MA plan | Moderate |
| Recertification intervals | CMN validity periods set by CMS regulation | Some plans require more frequent recertification than CMS mandates, particularly for oxygen and complex rehab | Lower |
Each row in that table is a category where a claim that would sail through Medicare FFS can be denied by an MA plan. The denial reason won't always make it obvious that the issue is plan policy rather than documentation.
If your denial rate on MA claims is running higher than on Medicare FFS, the gap is usually traceable to a handful of plan-specific policies your intake process isn't catching. DocuFindr's team can pull that apart for you in a free assessment.
Book Your Free Assessment →The prior authorization problem is worse in MA plans, even after CMS-0057-F
CMS-0057-F, which took effect in April 2026, compresses prior authorization timelines for MA plans: 7 calendar days for standard requests, 72 hours for urgent ones. That reform matters. But it addresses response speed, not denial rates. A plan can respond in 7 days and still deny the request.
MedPAC has documented for years that MA plans deny PA requests at rates significantly higher than traditional Medicare's coverage rates for the same services. The reasons vary: some plans apply stricter clinical criteria, some have automated review systems that flag claims for reasons Medicare wouldn't, and some, frankly, apply denial-first policies knowing that a portion of suppliers won't appeal.
The appeal process for MA denials is also different. For Medicare FFS, denials go through the MAC and then through CMS's appeals structure. For MA denials, the first appeal is internal to the plan. The plan that denied the claim reviews its own denial. Suppliers who win eventually (after two or three rounds) often find that the time cost of the appeal exceeded the value of the claim. That's not accidental.
One more wrinkle under CMS-0057-F: The 2026 reform requires MA plans to base PA decisions on current evidence and plan coverage policies. It also prohibits plans from using PA to discourage medically necessary care. But enforcement depends on CMS auditing plan behavior over time. For now, DME suppliers are still experiencing MA denial rates that have not meaningfully improved since the rule took effect.
The billing mistake that costs the most
The highest-cost mistake in MA billing isn't a missing form or a wrong code. It's treating MA claims as Medicare FFS claims with an extra PA step.
When a patient's plan is UnitedHealthcare or Humana or Aetna MA, the intake process that works for Medicare FFS will miss plan-specific requirements that produce denials you can't appeal your way out of easily. The supplier didn't do anything wrong by traditional Medicare standards. The claim was denied because the plan's coverage policy differs from the LCD, and the intake process checked against the LCD rather than the plan policy.
Verify enrollment, check LCD criteria, confirm PA requirement for the specific HCPCS code, collect CMN and F2F documentation, submit. The coverage standard is published and consistent.
Verify plan and plan year, check that plan's PA list for the specific HCPCS code, pull the plan's coverage policy for the equipment category, verify network status, then collect documentation to the plan's standard, not the LCD's.
That second column is harder. The plan's PA list changes. The coverage policy may not be available through a single public source. Network status requires a real-time check, not a one-time credentialing verification. And different plan products under the same insurer (HMO vs. PPO, regional vs. national) can have different policies for the same code.
Three operational changes that move the needle on MA claims
1. Identify the MA plan and specific plan product at intake, not at billing
The critical information isn't "this patient has Humana." It's "this patient has Humana Gold Plus HMO H1234-001" or whichever plan product, because PA requirements and coverage policies vary within a single insurer's portfolio. Capturing the plan ID at intake, before the order is processed, gives your team time to verify the applicable policies before documentation is collected from the physician. After the order is processed and the equipment is ordered, that window closes.
2. Build a separate MA denial tracking log, segregated from Medicare FFS
If your denial data combines MA and FFS denials, you can't see MA-specific patterns. A supplier getting hit by Aetna MA on CPAP claims and UHC MA on home oxygen claims looks, in aggregate, like a documentation problem. Broken out by payer, it looks like two separate plan policy problems with two different solutions. Segregated denial data tells you which plans are generating most of your MA write-offs, which codes they're targeting, and whether the denial reason is clinical, network, or administrative. You can't fix what you can't see.
3. For your top MA plans by volume, pull their coverage policies annually and compare them to your intake templates
Most large MA plans publish their coverage policies and prior authorization lists in their provider portals. For your top three or four plans by patient volume, pull those documents once a year and check whether your intake process and documentation templates reflect the current policy. This is slower work than checking an LCD update, because plan policies don't come with MAC-style revision notices. But for a supplier where 50% of Medicare volume is MA, the annual audit of three or four plan policies is worth the time relative to the denials it prevents.
Medicare Advantage was supposed to give beneficiaries better benefits and more choices. For patients it often does. For DME suppliers, it split the Medicare patient population into two groups with different rules, different documentation standards, and very different denial behavior. The group playing by the harder rules is now the majority. That shift happened gradually and then all at once. The billing processes at most DME operations haven't caught up.
Talk to DocuFindr about your MA denial exposure
We work with DME suppliers to identify where MA plan policies are diverging from your current intake process and where the revenue gaps are. If your MA denial rate is running above your Medicare FFS rate, there's usually a specific reason, and it's usually fixable. Let's find it.