Medicare Part B covers refraction only as part of a medical eye exam, not for routine vision correction

Refraction is the test an eye doctor performs to measure how light bends through your eye and determine your prescription for glasses or contacts. Medicare Part B pays for refraction only when it is done during a medical eye exam — meaning an exam to diagnose or treat an eye disease or condition. If you go in for a routine vision check with no medical reason, Medicare does not cover the refraction portion.

This distinction matters because many seniors think "eye exam" means one thing. It does not. A routine vision exam to update your glasses prescription is considered routine preventive care, which Original Medicare does not cover. A medical eye exam to check for glaucoma, cataracts, diabetic retinopathy, or other conditions is covered, and the refraction that happens during that visit is included.

Key Takeaways

  • Medicare Part B covers refraction only when it is part of a medical eye exam for a diagnosed eye disease or condition, not for routine vision correction.
  • If you have diabetes, glaucoma, age-related macular degeneration, or a history of eye disease, your eye exam is likely medical and refraction is covered.
  • Routine eye exams for updating your glasses or contact prescription are not covered by Original Medicare, though some Medicare Advantage plans may offer this benefit.
  • You will pay 20 percent coinsurance for the medical eye exam and refraction after you meet your Part B deductible.
  • Ask your eye doctor before the visit whether they are billing the exam as medical or routine, because this determines what Medicare will pay.

When Medicare pays for refraction

Medicare Part B covers the refraction when your eye doctor performs it as part of a medical eye exam. A medical eye exam is one where the doctor is evaluating you for a specific eye condition or disease. Common reasons include checking for glaucoma, monitoring diabetic eye disease, evaluating cataracts, assessing age-related macular degeneration, or following up on a previous eye problem.

If you have diabetes, you are may have access to to a covered medical eye exam once per year specifically to screen for diabetic retinopathy. During that exam, refraction is included and covered. Similarly, if you have a history of glaucoma or are at risk for it, the exam to check eye pressure and optic nerve health is medical, and refraction is covered as part of it.

The key is that the exam must have a medical purpose documented in your chart. The eye doctor's office will code the visit accordingly when they bill Medicare. If the coding is wrong, Medicare may deny the refraction portion, and you could be responsible for the cost.

When Medicare does not cover refraction

Medicare Part B does not cover routine eye exams or refraction for the purpose of updating your glasses or contact lens prescription. If you have no eye disease and you are going in straightforward because your vision has changed or your current prescription is old, that visit is considered routine preventive care. Original Medicare does not pay for routine preventive eye care.

This is true even if you have never had an eye exam before or if your vision has gotten significantly worse. The absence of a diagnosed condition means the exam is routine, not medical. You will be responsible for the full cost of the exam and any refraction performed.

Some Medicare Advantage plans (Part C) do cover routine eye exams and refraction as an added benefit. If you have a Medicare Advantage plan, check your plan documents or call the plan to ask whether routine eye exams are covered. Coverage varies widely by plan and by region.

What you pay for a covered medical eye exam and refraction

When Medicare covers the refraction as part of a medical eye exam, you pay 20 percent coinsurance after you have met your Part B deductible for the year. The deductible is the same for all Part B services combined — once you meet it, you pay coinsurance on covered services for the rest of the calendar year.

The actual amount you pay depends on what the eye doctor charges and what Medicare allows for that service in your area. Medicare sets a maximum amount it will pay, called the allowed amount. You pay 20 percent of that allowed amount, not 20 percent of the doctor's full bill. If the doctor is in-network with Medicare (accepts assignment), they cannot charge you more than the allowed amount.

If the eye doctor does not accept assignment, they can charge up to 15 percent more than the allowed amount, and you would owe that difference on top of your coinsurance. Always ask whether the eye doctor accepts Medicare assignment before your visit.

How to know whether your exam will be covered

Call your eye doctor's office before you schedule and tell them why you want the exam. Explain any eye conditions you have, any symptoms you are experiencing, or any reason you think the visit is medical rather than routine. Ask the office staff directly: "Will Medicare cover this exam, or will it be billed as routine?"

If you have diabetes, mention it. If you have had glaucoma screening before, mention that. If you are experiencing vision changes or eye pain, describe those. The office staff can then tell you whether the doctor will likely bill it as a medical exam.

If you are unsure, you can also contact Medicare directly at 1-800-MEDICARE to ask whether a specific reason for an eye exam would be covered. Have your Medicare number ready and be specific about your situation.

The difference between refraction and other eye services

Refraction is just one part of an eye exam. Other services — like measuring eye pressure, examining the retina, or testing visual fields — may be covered separately even if refraction is not. If you go in for a routine vision check and the doctor discovers high eye pressure or another medical condition, they may perform additional tests. Those tests could be covered as medical services even though the initial exam was routine.

Similarly, if you need glasses or contacts after a covered medical eye exam, the refraction itself is covered, but the glasses or contacts are not. Medicare does not cover eyeglasses, contact lenses, or the fitting of either, even when the refraction was covered. You pay for those out of pocket or through a separate vision plan if you have one.

Medicare Advantage and other vision coverage options

Original Medicare (Part A and Part B) does not cover routine eye exams or refraction for vision correction. However, many Medicare Advantage plans include routine eye exam coverage as part of their benefits. Some plans cover one routine eye exam per year; others cover two. Some also include a small benefit toward glasses or contacts.

If you are considering a Medicare Advantage plan or are already enrolled in one, check the plan's Summary of Benefits and Coverage document or call the plan to ask what vision services are included. Coverage differs by plan, and you need to know what your specific plan offers.

You can also purchase a standalone vision plan through a private insurance company. These plans are separate from Medicare and cover routine eye exams, refraction, and often provide discounts on glasses and contacts. The cost is typically $10 to $20 per month, depending on the plan.

What to ask your eye doctor

Before your appointment, ask these questions:

  • Will you be billing this visit as a medical eye exam or a routine exam?
  • Do you accept Medicare assignment?
  • If Medicare does not cover the refraction, what will I owe?
  • Will you provide an itemized bill showing what Medicare paid and what I owe?

After your appointment, ask for an itemized bill that shows what was billed to Medicare, what Medicare paid, and what you owe. This helps you track your deductible and coinsurance for the year and verify that you were not overcharged.

Frequently Asked Questions

Can I get a covered eye exam if I have never been diagnosed with an eye disease?

Not through Original Medicare. If you have no diagnosed eye condition, the exam is considered routine and not covered. However, if you have risk factors — such as diabetes, high blood pressure, or a family history of glaucoma — your doctor may recommend a medical eye exam to screen for disease. If the doctor documents a medical reason for the exam, it may be covered.

Does Medicare cover refraction for new glasses after cataract surgery?

Yes. After cataract surgery, the refraction to determine your new prescription is part of the post-operative medical care and is covered by Medicare. The surgery itself is covered, and the refraction during follow-up visits is also covered. However, the glasses themselves are not covered.

What if my eye doctor bills the exam as routine and I think it should be medical?

Contact your eye doctor's office and explain why you believe the exam was medical. If they agree, they can resubmit the claim to Medicare with the correct coding. If you disagree with the office, you can file an appeal with Medicare. Call 1-800-MEDICARE to start the appeal process.

If I have a Medicare Advantage plan, do I still pay the same coinsurance for eye exams?

No. Medicare Advantage plans set their own copays and coinsurance amounts, which differ from Original Medicare. Check your plan's documents or call the plan to find out what you pay for an eye exam. Some plans cover routine eye exams with no cost to you; others charge a copay.

Can I use my vision insurance at the same time as Medicare?

Medicare is your primary insurance, so it pays first. If you have a separate vision plan, it pays secondary — meaning it covers what Medicare does not. Coordinate with both your eye doctor and your vision plan to understand what each covers and what you owe.