Medicare Advantage coverage rules
Medicare Advantage Prior Authorization and Referral Rules Before You Enroll
A plan’s approval and referral process can affect how you reach specialists, procedures, equipment and other covered care.
Medicare Advantage plans must cover Medicare-covered services, but plans may manage access through provider networks, referrals and prior authorization. These requirements are separate from your copay and separate from whether a provider appears in the network directory.
Three different questions
Network, referral and authorization are not interchangeable
| Requirement | What it asks | Who usually handles it | Common mistake |
|---|---|---|---|
| Network | Does the provider or facility participate in the plan? | The member, provider and plan verify participation. | Assuming an in-network provider makes every service automatically covered. |
| Referral | Must a primary-care clinician direct the member to a specialist? | The referring clinician’s office. | Scheduling a specialist without the required referral. |
| Prior authorization | Must the plan approve coverage before a service, item or treatment? | The ordering or treating provider normally submits clinical information. | Assuming a referral or scheduled appointment is the same as plan approval. |
Services to investigate
Ask about the care most relevant to you
Authorization lists differ by plan. Instead of asking whether a plan “uses prior authorization,” ask how it handles the services you are likely to need.
Diagnostic care
- Advanced imaging
- Specialized testing
- Sleep studies
Treatment
- Outpatient procedures
- Rehabilitation or therapy
- Infusions and certain Part B drugs
Equipment and settings
- Durable medical equipment
- Home health services
- Post-acute or facility care
This list is illustrative, not a statement that every plan requires authorization for every item. The Evidence of Coverage and plan authorization list control.
2026 medical-request timing
CMS shortened certain prior-authorization decision timeframes
Beginning January 1, 2026, impacted payers including Medicare Advantage organizations generally must send decisions for non-drug medical items and services within:
Standard request
Seven calendar days after receiving the request.
Expedited request
72 hours when the urgent standard applies.
The payer must also provide a specific reason for a denial. These rules do not mean every request will be approved, and prescription-drug authorization uses different Part D processes and timeframes.
Before choosing a plan
Review the rules around your current care
List active treatment and expected services
Include ongoing therapy, scheduled procedures, equipment, infusions, specialist care and recurring imaging.
Confirm the exact providers and facilities
Authorization does not fix an out-of-network provider problem. Complete the provider-network check separately.
Ask which services require approval
Use the Summary of Benefits, Evidence of Coverage and the plan’s current prior-authorization list.
Understand the referral workflow
If referrals apply, determine whether your primary-care office is comfortable coordinating them and whether your specialists receive them efficiently.
Ask about continuing treatment
If you are already receiving an active course of treatment when you change Medicare Advantage plans, ask how the new plan will apply Medicare’s continuity-of-care protections. CMS requires a minimum 90-day transition period for an enrollee undergoing treatment who switches to a new Medicare Advantage coordinated care plan, during which the new plan may not require prior authorization for that active course of treatment.
Plan type matters
HMO and PPO labels provide clues, not complete answers
HMO
HMOs commonly use primary-care coordination and may require referrals for specialists. Exact exceptions and authorization rules vary by plan.
PPO
PPOs generally do not require specialist referrals, but they may still require prior authorization for certain services, procedures or equipment.
Review the complete Medicare Advantage HMO versus PPO guide and verify the exact plan rather than assuming every plan with the same label operates identically.
If something goes wrong
Get the written reason before choosing the response
A denial may result from missing records, unmet coverage criteria, a network problem, an incorrect code or another issue. Correcting an incomplete request is different from appealing a medical-necessity decision.
Use our guide for a Medicare Advantage prior-authorization denial when a plan has already refused coverage.
Emergency care
Do not delay emergency evaluation for routine authorization
Medicare Advantage plans must cover emergency and urgently needed services under Medicare rules. Call 911 or seek emergency care when appropriate. Coverage and follow-up questions can be addressed after immediate safety needs.
Frequently asked questions
Prior authorization and referral FAQ
Is a referral the same as prior authorization?
No. A referral generally directs you from one clinician to another. Prior authorization is a plan coverage decision requested before certain care.
Do PPO plans use prior authorization?
They may. PPO plans generally do not require specialist referrals, but prior authorization can still apply to particular services, procedures, equipment or medications.
Does being in network mean the service is already approved?
No. Network participation and authorization are separate. An in-network service may still need prior approval and must meet coverage requirements.
Who normally submits a medical prior-authorization request?
The ordering or treating provider generally submits the request and supporting clinical information. The member should still confirm that the process was started and monitor the decision.
Does an authorization guarantee the claim will be paid?
Not necessarily. The service must still be provided as authorized, while coverage is active and under the plan’s other applicable rules. Review the authorization and plan documents.
More Medicare guidance
Related Articles
Official Medicare and CMS resources
Independent Medicare guidance
Compare more than premiums and copays
Benjamin Thompson can help review provider networks, referrals, authorization rules, prescriptions and expected costs before you select Medicare Advantage coverage.
Authorization lists, referral rules, provider participation and coverage criteria vary by plan and may change. Official plan documents and written plan decisions control.