Original Medicare: Nationwide Provider Access
One of the significant advantages of Original Medicare (Parts A and B) is its broad provider access. With Original Medicare, you can see any physician, specialist, hospital, or healthcare facility in the United States that accepts Medicare. You do not need a referral to see a specialist. You do not need to stay within a network. If you travel frequently, spend time in multiple states, or have relationships with specialists at major academic medical centers, Original Medicare provides unmatched flexibility.
Approximately 93% of non-pediatric physicians in the United States accept Medicare. This is a high acceptance rate, though it does mean a small percentage of physicians do not participate. When a provider accepts Medicare, they agree to accept Medicare's approved payment amount as payment in full (plus your 20% coinsurance and deductible). Understanding the terminology of how providers participate helps you avoid unexpected bills.
Assignment, Non-Participating, and Opt-Out: What They Mean
Not all Medicare-accepting providers are the same. There are three categories:
- Participating providers (accept assignment): These providers accept Medicare's approved amount as full payment. Medicare pays 80% (after your deductible), and you pay the 20% coinsurance. You cannot be billed more than this amount. This is the standard for most providers.
- Non-participating providers: These providers accept Medicare patients but have not agreed to accept Medicare's approved amount as full payment. They can charge up to 15% more than the Medicare-approved amount (this is called the "limiting charge"). You may owe more than with a participating provider, but the provider still files claims with Medicare on your behalf.
- Opt-out providers: These providers have formally opted out of Medicare entirely. They do not file Medicare claims. You pay 100% of their charges out of pocket, and Medicare will not reimburse you for any of it. You must sign a private contract with opt-out providers before receiving non-emergency care from them. These are typically physicians who work in concierge or direct-pay practices.
Medicare Advantage: The Network Difference
When you enroll in a Medicare Advantage plan (Part C), you are no longer using Original Medicare directly for most services. Instead, your care is managed through the private insurer's network. This fundamentally changes your provider access.
With an HMO Medicare Advantage plan, you must use in-network providers for all non-emergency care. Going outside the network means paying the full cost yourself. With a PPO Medicare Advantage plan, you can use out-of-network providers, but you pay more. The crucial point: a provider who accepts Medicare generally does not automatically accept every Medicare Advantage plan. These are separate contracts. A doctor may take Original Medicare but have no contract with the Medicare Advantage plan you are considering.
Why "Takes Medicare" Is Not Enough
This is one of the most common and costly misunderstandings in Medicare. When you ask your doctor's office "do you take Medicare?" and they say yes, they mean they accept Original Medicare. They may or may not participate in any given Medicare Advantage plan. Before enrolling in a Medicare Advantage plan, you must ask: "Do you participate in [specific plan name and carrier] Medicare Advantage plan?" This is a different question, and the answer may be different.
Provider directories maintained by Medicare Advantage plans are updated annually but may contain errors. A provider may have dropped a plan network after the directory was published. Always call the provider's office directly and confirm their participation in your specific plan, using the plan's exact name and contract year, before enrolling.
How to Check Your Doctors Before Enrolling
- For Original Medicare: visit Medicare.gov and use the Care Compare tool to verify a provider accepts Medicare assignment.
- For Medicare Advantage: call each provider's office directly and ask if they are currently in-network for the specific plan you are considering, by plan name and carrier.
- Ask about your preferred hospital system, not just your doctors. An in-network physician may not have privileges at an in-network hospital, or may send you to an out-of-network facility for procedures.
- Check the plan's online provider directory, but treat it as a starting point, not final confirmation.
- Ask your agent to verify network participation before you enroll. This is one of the most valuable things an experienced Medicare agent can do for you.
Insurance Innovators LLC helps clients verify provider networks before every enrollment decision. Call us at (530) 395-5309 and we will check your specific doctors and hospitals against the plans available in your area.