Medicare Referral Rules: When You Need Permission To See a Specialist

Original Medicare Does Not Require Referrals; Medicare Advantage Plans Often Do

Original Medicare (Part A and Part B) lets you see any specialist you want without asking your primary care doctor first. You can call a cardiologist, dermatologist, or orthopedist directly and schedule an appointment. Medicare will cover the visit as long as the doctor accepts Medicare and the care is medically necessary.

Medicare Advantage plans (Part C) work differently. Most of them require you to get a referral from your primary care doctor before you see a specialist. The referral is usually a form or electronic message your doctor sends to the insurance company and the specialist. Without it, you may have to pay the full cost of the visit yourself, or the plan may deny the claim after the fact.

The rule applies to most specialist visits, though some plans carve out exceptions for emergencies or certain types of care. If you have a Medicare Advantage plan, your plan documents or member handbook will list which specialists need referrals and which do not.

Key Takeaways

Original Medicare has no referral requirement — you can see any Medicare-accepting specialist without permission from your primary care doctor.
Medicare Advantage plans usually require a referral from your primary care doctor before you see a specialist, and not getting one can leave you responsible for the bill.
Some Medicare Advantage plans exempt certain specialists (like OB/GYNs or eye doctors) from the referral requirement, so check your plan documents.
If you need urgent specialist care and cannot reach your primary doctor, tell the specialist's office and your plan — many have expedited referral processes for emergencies.

How Referrals Work in Medicare Advantage Plans

When your primary care doctor writes a referral, they are telling your Medicare Advantage plan that they believe you need to see a specialist and that the visit is medically necessary. The referral usually includes the reason for the visit, which specialist you need to see, and sometimes how many visits you may need.

Your primary care doctor's office typically sends the referral electronically to your plan and to the specialist's office. You do not usually have to do anything — the offices handle it. Once the referral is in the system, you can call the specialist and schedule your appointment.

Some plans set a time limit on referrals (for example, they may be valid for 30 or 60 days), and some limit the number of visits covered under one referral. If your specialist thinks you need more visits after that period, your primary care doctor will need to send another referral.

Specialists Often Exempt From Referral Requirements

Many Medicare Advantage plans do not require referrals for certain types of specialists. The most common exemptions are:

Obstetricians and gynecologists (OB/GYNs)
Ophthalmologists and optometrists (eye doctors)
Dentists (though dental care is usually a separate benefit)
Mental health providers and therapists
Chiropractors (in plans that cover them)

These are called direct-access specialists, and you can usually call them directly without a referral. However, the rules vary by plan and by state, so check your plan documents or call your plan's customer service line to confirm which specialists you can see without a referral.

What Happens If You See a Specialist Without a Referral

If your Medicare Advantage plan requires a referral and you see a specialist without one, you have two risks. First, the plan may deny the claim, leaving you to pay the full bill. Second, the specialist's office may ask you to pay upfront if they know you do not have a referral, because they cannot may provide the plan will pay.

If you realize after the visit that you should have had a referral, contact your plan when ready. Some plans will retroactively approve a referral if your primary care doctor confirms the visit was medically necessary. This is not may provide, but it is worth asking.

To avoid this problem, always call your plan or your primary care doctor's office before scheduling a specialist visit if you have a Medicare Advantage plan. It takes five minutes and can save you hundreds of dollars.

How to Request a Referral From Your Primary Care Doctor

Call your primary care doctor's office and tell them which specialist you need to see and why. You do not need to schedule an appointment with your primary care doctor first — most offices can process referral requests over the phone or through the patient portal.

Have the specialist's name and office location ready when you call. If you do not know which specialist you need, your primary care doctor can recommend one. Ask the office how long the referral takes to process (usually one to three business days) and whether they will send it electronically or by mail.

Once the referral is approved, the office will tell you, and you can call the specialist to schedule. If your primary care doctor's office says they need more information before they can send the referral, ask what information and provide it as soon as you can.

Original Medicare and Specialist Access

If you have Original Medicare, you do not need a referral to see a specialist. You can call any doctor who accepts Medicare and schedule an appointment directly. This includes cardiologists, neurologists, rheumatologists, and any other specialty.

The only requirement is that the specialist accepts Medicare and that the care is medically necessary. If a specialist does not accept Medicare, you can still see them, but Medicare will not pay, and you will owe the full cost unless you have a supplemental insurance plan that covers out-of-network care.

Some people with Original Medicare also buy a Medigap policy (supplemental insurance), which covers some of the costs that Medicare does not. Medigap does not require referrals either — you can see any doctor who accepts Medicare and your Medigap plan.

Switching Plans and Referral Rules

If you switch from Original Medicare to a Medicare Advantage plan, or from one Medicare Advantage plan to another, your old referrals do not carry over. You will need new referrals from your new plan's primary care doctor if your new plan requires them.

If you are in the middle of ongoing specialist care when you switch plans, tell your specialist's office about the change. They can help you understand what you need to do to continue care under your new plan, and they can work with your new primary care doctor to get a referral if needed.

If you are thinking about switching plans, ask whether your current specialists are in the new plan's network. If they are not, you may have to change doctors, or you may have to pay out-of-network costs. This is an important factor in choosing a plan.

Frequently Asked Questions

Can I see a specialist without a referral if I have a Medicare Advantage plan?

Most Medicare Advantage plans require a referral, but some specialists are exempt — usually OB/GYNs, eye doctors, and mental health providers. Check your plan documents or call your plan to find out which specialists you can see without a referral.

What if my primary care doctor refuses to give me a referral?

If your doctor refuses to refer you, you can contact your Medicare Advantage plan and ask them to review the decision. You can also request a second opinion from another doctor in your plan's network. If you believe the refusal is unfair, you have the right to file a complaint with your plan.

How long does it take to get a referral?

Most referrals are processed within one to three business days. If you need urgent care, tell your primary care doctor's office that it is urgent, and they may be able to send it the same day. Emergency care does not require a referral in any Medicare plan.

Do I need a referral to see a mental health provider with Medicare Advantage?

Most Medicare Advantage plans do not require a referral for mental health care — you can usually call a therapist or psychiatrist directly. However, some plans do require one, so check your plan documents or call your plan to confirm.

What if I go out of network to see a specialist?

If you see a specialist who is not in your Medicare Advantage plan's network, the plan may not cover the visit at all, or it may cover only a small portion. Original Medicare covers any Medicare-accepting doctor, whether in-network or not. If you have a Medigap policy, it may cover some out-of-network costs.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.