Medicare Advantage Overview for Healthcare Workers

Q: What is Medicare Advantage and how is it different from regular Medicare?

Medicare Advantage is a private insurance plan covering Medicare benefits through a private insurer rather than the federal government. MA plans may add extra benefits but also add requirements traditional Medicare does not have: prior authorisation, network restrictions, and referral requirements. In 2024, over 34 million people were enrolled in MA plans, more than half of all Medicare beneficiaries.

Q: What is prior authorisation and why does it matter in Medicare Advantage?

Prior authorisation requires plan approval before a service is provided. Without it, the plan may refuse to pay even if care was medically necessary. MA plans made 50 million prior auth requests in 2023 versus 400,000 for traditional Medicare. 95% of physicians reported care delays from prior auth requirements, and 78% said patients abandoned treatment as a result.

Q: How long does a Medicare Advantage plan have to respond to a prior auth request?

Under 2024 CMS rules: 14 calendar days for standard requests and 72 hours for urgent requests. The clock starts when the plan receives the request. If no response is received within these windows, escalate to your supervisor and case management team immediately.

Q: Does a Medicare Advantage plan have to cover emergency care?

Yes. MA plans must cover emergency care at any hospital, in-network or not, with no prior authorisation required. Emergency coverage is mandatory under 42 CFR 422.113. After stabilisation, the plan may require transfer to an in-network facility.

Q: What should I do if a patient's MA plan denies coverage for a hospital stay?

Report the denial to your supervisor and case management immediately. Issue a Notice of Medicare Non-Coverage (NOMNC) before discharge. The patient has the right to a fast-track QIO review before leaving. Do not discharge until the NOMNC is issued and the review opportunity has been given. The plan cannot force discharge while the review is pending.

Q: What is a Medicare Advantage HMO and how does it affect patient care?

An HMO requires all non-emergency care from in-network providers. Out-of-network care is not covered except in emergencies. Patients must use a primary care doctor for referrals to specialists. Always verify network status before referring an HMO patient to a specialist or facility.

Q: Can a Medicare Advantage plan use stricter medical necessity rules than regular Medicare?

MA plans may use internal coverage criteria when Medicare guidance is unclear, but since the 2024 Final Rule must follow national/local Medicare coverage policies as the baseline. MA plans have historically applied stricter criteria for SNF, home health, and rehab services. Denials for services covered by traditional Medicare should be appealed.

WORKER SAFETY: Medicare Advantage Overview

Medicare Advantage Overview: What Every
Healthcare Worker Needs to Know

If you work in a hospital, clinic, home health agency, or care facility, many of your patients are in Medicare Advantage (MA) plans. MA is not the same as regular Medicare. It has different coverage rules, different networks, different prior authorisation requirements, and different billing processes, and those differences affect what you can do for your patients, how fast you can do it, and whether the plan will pay for it. This guide explains what MA is, how it works, what you need to check before providing care, and what to do when something goes wrong.

34M+

People in Medicare Advantage (2024)

In 2024, more than 34 million people, over half of all Medicare beneficiaries, were enrolled in Medicare Advantage plans. If you work in any healthcare setting that sees senior or disabled patients, a large share of the people you care for are in MA plans. Understanding how MA works is part of doing your job safely and correctly.

Georgetown University: Prior Authorization in Medicare Advantage (March 2025)

1,250x

More Prior Auth Requests Than Regular Medicare

In 2023, Medicare Advantage plans processed 50 million prior authorisation requests, 1,250 times more than traditional Medicare’s 400,000, even though both programmes cover a similar number of people. This is the biggest practical difference between MA and regular Medicare for healthcare workers: almost everything in MA needs checking before you provide it.

WHA Newsletter: KFF Analysis of Medicare Advantage Prior Auth (2025)

95%

of Physicians Reported Care Delays from Prior Auth

A 2023 American Medical Association survey found 95% of physicians reported care delays caused by MA prior authorisation requirements, and 78% said patients actually abandoned treatment because of those delays. Prior auth is not a paperwork problem, it is a patient safety issue that healthcare workers encounter every shift.

AHA: Improving Access to Care for MA Beneficiaries (2025)

Hazard Overview: What Goes Wrong When Healthcare Workers Don’t Know How MA Works

Medicare Advantage is not a simpler version of regular Medicare. It is a different system with its own rules, and those rules vary by plan, by service type, and sometimes by the time of year. When healthcare workers do not understand how MA works, several things go wrong: patients get care that the plan then denies; workers order services without checking authorisation and the billing fails; patients get referred to providers who are out of network; and delays caused by prior authorisation requests result in patients not getting care they need.

None of these problems start with bad intentions. They start with a gap in knowledge. A worker who knows how MA works can flag a potential authorisation issue before it becomes a denial. A worker who does not may not find out until after the care was provided, and by then, it is too late to change the outcome.

Prior Auth Hazard

Providing a service that needs prior authorisation without getting it first. The patient receives care, the plan denies payment, and the patient may be billed. This is the most common MA-related mistake in clinical settings.

Network Hazard

Referring a patient to a specialist or facility that is not in their MA plan’s network. Many MA plans are HMO or HMO-POS structures requiring in-network referrals. An out-of-network referral can leave the patient with the full cost.

Coverage Difference Hazard

Assuming an MA plan covers the same things as regular Medicare with the same rules. MA plans may use stricter medical necessity criteria than traditional Medicare for the same service, so what was approved for a traditional Medicare patient may be denied for the MA patient in the next bed.

Discharge Hazard

Discharging a patient to a skilled nursing facility (SNF) or home health without verifying the plan’s coverage criteria and network. MA SNF and home health denials are among the most common and most harmful authorisation failures reported by hospitals and care coordinators.

Signs of Danger: When to Stop and Check Before Proceeding

Stop and check with your billing, case management, or supervisor team before proceeding if any of the following applies to the patient’s situation.

The patient’s insurance card says Medicare Advantage, HMO, or shows a private plan name rather than just “Medicare.” This patient is in an MA plan, not traditional Medicare, different rules apply.

You are about to order imaging, a procedure, a specialist referral, home health, or SNF placement for an MA patient. These are the highest-frequency prior authorisation requirement categories.

You are referring a patient to a specialist or facility and you have not confirmed that provider or facility is in the patient’s MA plan network. In HMO-type MA plans, out-of-network referrals are not covered except in emergencies.

A patient tells you they “just joined a new plan” or switched plans in January. Coverage rules, networks, and formularies may have changed and prior information about the patient’s coverage may no longer be accurate.

A prior authorisation request has been pending for more than 72 hours without a response for a non-urgent request, or more than 24 hours for an urgent request. These are the maximum timeframes MA plans must respond in, escalate to your supervisor or case management immediately.

Step-by-Step: Medicare Advantage Overview and How to Work Safely Within It

Identify whether the patient is in traditional Medicare or a Medicare Advantage plan

Check the patient’s insurance card and the electronic health record at every visit. Traditional Medicare cards are issued by the federal government and show “Medicare” and a Medicare Beneficiary Identifier (MBI). Medicare Advantage cards are issued by the private plan, they show the plan’s name (Humana, Aetna, UnitedHealthcare, BCBS, etc.) and often say “Medicare Advantage,” “HMO,” or “PPO.” The plan type determines which rules apply. If you are not sure, contact your billing or admissions team before providing anything beyond emergency care.

Know the three main MA plan types and what they mean for care

Most MA plans are one of three types. An HMO (Health Maintenance Organisation) requires the patient to use in-network providers and get a referral from their primary care doctor for specialist visits, out-of-network care is not covered except for emergencies. A PPO (Preferred Provider Organisation) allows the patient to see out-of-network providers but at a higher cost. An HMO-POS (Point of Service) is like an HMO but allows some out-of-network care in specific situations. Knowing the plan type tells you immediately whether a referral needs to be in-network and whether a specialist visit needs a referral authorisation.

Check prior authorisation requirements before ordering services

For MA patients, check whether the service, procedure, or referral needs prior authorisation before you order it. Your facility’s billing or case management team maintains lists of services that commonly require prior auth for each MA plan your facility contracts with. If you are not sure, ask before ordering, not after. Under 2024 CMS rules, MA plans must decide standard prior auth requests within 14 calendar days and urgent requests within 72 hours. If the request is urgent and the patient’s health is at risk, ask for an expedited review. Source: CMS: Medicare Advantage Prior Authorisation Requirements (2024 Final Rule)

Verify network status before referring to specialists or facilities

Before referring an MA patient to a specialist, home health agency, or skilled nursing facility, confirm that provider or facility is in the patient’s MA plan network. MA plan provider directories can be found on the plan’s website, or your billing team can verify by calling the plan. Do not rely on the provider directory alone, directories can be out of date. Always call to verify, especially for SNF placements where the plan’s network may exclude certain facilities your hospital normally uses. Source: AHA: Improving Access to Care for MA Beneficiaries (2025)

Document clinical necessity clearly in the patient record

MA plans review prior authorisation requests against their medical necessity criteria, which may be stricter than traditional Medicare’s criteria for the same service. Your clinical documentation in the patient record is the evidence the plan uses to make its decision. Document the clinical reason for the service clearly: what the patient’s condition is, what the service is, why it is necessary, and what will happen if it is not provided. Vague documentation, “patient needs MRI”, generates denials. Specific documentation, “patient presents with progressive left-sided weakness, MRI ordered to evaluate for stroke, TIA, or mass lesion”, supports approval.

Know what to do when a prior auth request is denied

A denial is not the end of the road. MA plans must provide a written notice of the denial with the reason and with the patient’s appeal rights. The patient has 65 calendar days (from January 2025) to file an appeal. The plan must decide a standard appeal within 60 days and an expedited appeal within 72 hours. As a healthcare worker, your role in an appeal is to provide additional clinical documentation that addresses the plan’s reason for denial. Report the denial to your supervisor and to your facility’s case management or utilisation review team immediately, do not wait. Source: CMS: Medicare Managed Care Appeals and Grievances; 42 CFR 422.578

Do / Do Not: Working Safely with Medicare Advantage Patients

DO

✓

Check the patient’s insurance card and EHR at every visit to confirm MA plan type

✓

Confirm prior auth requirements before ordering services for MA patients

✓

Verify network status by calling the plan before referring to specialists or SNFs

✓

Document clinical necessity specifically in the patient record, not just the service ordered

✓

Report any denial immediately to your supervisor and case management team

DO NOT

✗

Do not assume MA coverage is the same as regular Medicare, it is not

✗

Do not provide services that need prior auth without getting it first, even if the clinical need is obvious

✗

Do not rely on the plan’s online directory alone to confirm network status, call to verify

✗

Do not wait until the end of the shift to report a denial, report it immediately

✗

Do not assume last year’s authorisation covers the same service this year, re-verify

Emergency Response: When to Provide Care Without Prior Auth

True emergencies: always provide care first

MA plans cannot require prior authorisation for emergency care. If the patient’s condition is life-threatening or seriously worsening, provide care immediately. MA plans must cover emergency services at any hospital, whether in-network or not. Do not delay emergency care to seek authorisation. Document the emergency nature of the care as soon as the situation is stable, this documentation is what the plan uses to process the emergency claim. Source: CMS: MA Emergency Care Requirements; 42 CFR 422.113

Urgently needed care: request expedited review

If the patient’s condition is urgent but not an immediate emergency, ask for an expedited prior authorisation review. Under the 2024 CMS rules, MA plans must respond to expedited requests within 72 hours. Contact your case management or billing team to initiate the expedited request. Document why the request is urgent in the patient record. Do not allow the 72-hour window to pass without following up, escalate to your supervisor if you have not received a response within 48 hours of the request.

Unexpected denial during an active admission: escalate immediately

If an MA plan denies continued coverage for an inpatient admission while the patient is still in the hospital, the patient has the right to a fast-track appeal before being discharged. They must receive a Notice of Medicare Non-Coverage (NOMNC) before discharge. Do not discharge the patient until the NOMNC has been issued and the patient has had the opportunity to request a review. Report the situation to your supervisor and case management team immediately. The plan cannot require the patient to leave before the review is complete.

Supervisor Tips: Your Responsibilities When Your Team Works with MA Patients

Make sure every team member can identify an MA patient

If your team cannot reliably identify which patients are in MA plans versus traditional Medicare, every MA-related error that follows is a training and supervision failure. Include MA plan identification in onboarding for all clinical and administrative staff. Spot-check periodically: ask team members how they would identify a patient’s plan type when they first check in.

Create a clear escalation path for prior auth delays and denials

Your team should know exactly who to contact and what to do when a prior auth request is delayed, denied, or when a patient needs urgent service that has not yet been authorised. Write this path down and post it where your team works. A team that has to figure out the escalation path during a denial is a team that will handle the denial slowly and badly.

Track denied prior auth requests and review them at team meetings

Every denial is a data point. If your team is consistently getting denials for the same service type or from the same plan, there is a documentation or process problem that training can fix. Review denial patterns monthly and adjust your team’s documentation approach based on what the plan’s denial letters say the missing clinical justification was.

Ensure NOMNC notices are issued correctly and on time

The Notice of Medicare Non-Coverage (NOMNC) must be issued to MA patients before discharge when the plan has ended coverage for a hospital stay. This is not an administrative formality, it is a legal requirement that protects the patient’s right to appeal. Supervisors are responsible for ensuring their team knows when a NOMNC is required and that it is issued before any discharge conversation happens.

Worker Safety Checklist: Working with Medicare Advantage Patients

Before Care

Plan type confirmed, MA or traditional Medicare

Prior auth requirements checked for any services to be ordered

Network status verified for any referrals or transfers

During Care

Clinical necessity documented specifically in patient record

Any auth requests submitted and tracked with expected response date

Any denial reported immediately to supervisor and case management

At Discharge

SNF or home health network status verified before placement

NOMNC issued to patient if plan has ended inpatient coverage

Patient informed of appeal rights if any coverage was denied

Key Takeaways

MA is not regular Medicare, knowing the difference protects your patients

Medicare Advantage plans process 1,250 times more prior authorisation requests than traditional Medicare for the same enrolled population. That number tells you everything about how different the two systems are. Every time you treat an MA patient the same as a traditional Medicare patient without checking the rules, you are guessing, and guesses generate denials that delay or cancel your patient’s care.

Check before you order, not after

A prior authorisation that is not obtained before a service is provided cannot be obtained retroactively with the same result. Once the service is delivered without authorisation, the plan’s decision on whether to pay is made against a much harder standard. The 95% of physicians who reported care delays from prior auth requirements were mostly dealing with cases where the check happened at the wrong point in the process. Check before. Not after.

A denial is not the end, report it immediately and the process can continue

When an MA plan denies a prior auth request, the patient has appeal rights and the clinical team has options, but only if the denial is reported immediately. A denial that sits in an inbox for a day or two while a worker decides what to do with it is a denial where the appeal window is closing and the patient is not getting care they may be entitled to. Report every denial the moment you receive it. Your supervisor and case management team handle what comes next, your job is to make sure they know about it right away.

Frequently Asked Questions

What is Medicare Advantage and how is it different from regular Medicare?

Medicare Advantage (MA) is a private health insurance plan that covers Medicare benefits. People with Medicare can choose to get their Medicare coverage through the federal government’s traditional Medicare programme, or through a private MA plan. MA plans must cover at least everything traditional Medicare covers, but they can add extra benefits, and they can also add requirements that traditional Medicare does not have, including prior authorisation for services, network restrictions, and referral requirements. In 2024, over 34 million people, more than half of all Medicare beneficiaries, were enrolled in MA plans. Source: Georgetown University: Prior Authorization in Medicare Advantage (March 2025)

What is prior authorisation and why does it matter in Medicare Advantage?

Prior authorisation (prior auth) is a requirement that the patient’s MA plan must approve a service, procedure, or drug before it is provided. Without the authorisation, the plan may refuse to pay for the service even if it was medically necessary and correctly performed. MA plans use prior auth far more often than traditional Medicare, in 2023, MA plans processed 50 million prior auth requests compared to 400,000 for traditional Medicare. A 2023 AMA survey found 95% of physicians reported care delays from prior auth, and 78% said patients abandoned treatment as a result. Source: AHA: Improving Access to Care for MA Beneficiaries (2025)

How long does a Medicare Advantage plan have to respond to a prior auth request?

Under the 2024 CMS rules, MA plans must respond to standard prior authorisation requests within 14 calendar days and urgent requests within 72 hours. If the plan does not respond within these timeframes, escalate to your supervisor and your facility’s case management or utilisation review team. Plans that consistently fail to meet these deadlines can be reported to CMS. The 14-day and 72-hour clocks start from when the plan receives the request, so make sure the request was actually submitted and received, not just prepared. Source: CMS: Medicare Advantage Prior Authorisation Requirements (2024 Final Rule); 42 CFR 422.568

Does a Medicare Advantage plan have to cover emergency care?

Yes. MA plans must cover emergency care at any hospital, whether that hospital is in-network or not. No prior authorisation is required for emergency services. Emergency care is defined as a medical condition that a reasonable person would believe requires immediate medical attention to prevent serious risk to life or health. After the emergency is stabilised, the plan may require the patient to transfer to an in-network facility or follow in-network care requirements. The emergency coverage obligation is not optional for MA plans, it is required by law under 42 CFR 422.113. Source: 42 CFR 422.113, Emergency and Urgently Needed Care

What should I do if a patient’s MA plan denies coverage for a hospital stay?

Report the denial to your supervisor and case management team immediately. The patient must receive a Notice of Medicare Non-Coverage (NOMNC) before being discharged. The NOMNC informs the patient of the denial and their right to a fast-track appeal before discharge. The patient can contact the plan’s Quality Improvement Organisation (QIO) to request a review, the QIO must respond quickly, often within days. Do not discharge the patient until the NOMNC has been issued and the patient has had the opportunity to request this review. The plan cannot force a discharge while the review is pending. Source: CMS: Medicare Non-Coverage Notices; 42 CFR 422.624

What is a Medicare Advantage HMO and how does it affect patient care?

A Medicare Advantage HMO (Health Maintenance Organisation) plan requires the patient to receive all non-emergency care from providers who are in the plan’s network. Patients must usually choose a primary care doctor who coordinates their care and provides referrals to specialists. Out-of-network care is not covered except in emergencies. This means that if you refer an HMO patient to a specialist who is not in the plan’s network, the patient may be responsible for the full cost of that visit. Always verify that the specialist or facility is in-network before making a referral for an HMO patient. Source: CMS Medicare Advantage Plan Types overview

Can a Medicare Advantage plan use stricter medical necessity rules than regular Medicare?

MA plans may use their own internal coverage criteria (ICC) when determining medical necessity, but since the 2024 CMS Final Rule, they must follow national and local Medicare coverage policies as the baseline. They may use stricter criteria only when Medicare guidance is unclear for a specific service. In practice, MA plans have historically applied more stringent criteria than traditional Medicare for the same services, particularly for skilled nursing facility, home health, and rehabilitation services. When a service is covered by traditional Medicare but denied by an MA plan, that denial can and should be appealed. Source: AHA: Improving Access to Care for MA Beneficiaries (2025); 42 CFR 422.101

Sources

Government and Regulatory Sources

CMS: Medicare Advantage Programme Requirements: governing regulatory framework for MA plans including prior authorisation timeframes (14 days standard, 72 hours urgent under 2024 Final Rule requirements; 42 CFR 422.568), emergency care coverage obligations (42 CFR 422.113), and internal coverage criteria requirements (42 CFR 422.101).
CMS: Medicare Managed Care Appeals and Grievances (MMCAG): source for appeal timeframes, the Notice of Medicare Non-Coverage (NOMNC) requirement before inpatient discharge, the fast-track Quality Improvement Organisation review process, and the January 2025 update to the 65-day appeal filing window.

Research and Advocacy Sources

Georgetown University Medicare Policy Initiative: Prior Authorization in Medicare Advantage (March 2025): source for the 2024 MA enrollment figure (34 million, more than half of all Medicare beneficiaries) and the characterisation of prior authorisation as a utilisation management tool used by MA plans.
American Hospital Association: Improving Access to Care for Medicare Advantage Beneficiaries (January 2025): source for the 2023 AMA survey finding that 95% of physicians reported care delays from MA prior authorisation requirements and 78% reported patients abandoning treatment as a result; and for the AHA characterisation of how MA plans apply more stringent medical necessity criteria than traditional Medicare for skilled nursing, home health, and rehabilitation services.
Wisconsin Hospital Association Newsletter: KFF Analysis of MA Prior Authorisation (October 2025): source for the Kaiser Family Foundation finding that MA plans made 50 million prior authorisation determinations in 2023, 1,250 times higher than traditional Medicare’s 400,000, even though both programmes cover a similar number of people.