Where to file your Medicare complaint

You can file a complaint about Medicare directly with Medicare itself through a process called a Part B appeal or a grievance, depending on what you are complaining about. The fastest way to start is by calling 1-800-MEDICARE (1-800-633-4227), where a representative can tell you which type of complaint fits your situation and walk you through the first steps. You can also file online at www.cms.gov under "Complaints and Appeals," though the phone line is usually faster for your first call.

If your complaint is about a Medicare Advantage plan (Part C) or a prescription drug plan (Part D) instead of Original Medicare, the process is different — you file the complaint with your insurance company first, not with Medicare directly. Your plan's customer service number is on your insurance card.

If you believe Medicare or your plan has broken a rule or treated you unfairly, you have the right to file. There is no cost to file, and you do not need a lawyer.

Key Takeaways

  • Call 1-800-MEDICARE to report problems with coverage decisions, billing, or how you were treated by Medicare or a provider.
  • A grievance is for problems that already happened; an appeal is for a coverage decision you disagree with — the representative on the phone will tell you which one you need.
  • You have one year from the date of the problem to file a complaint with Original Medicare, though filing sooner protects your rights better.
  • If you have a Medicare Advantage or prescription drug plan, file your complaint with your insurance company first, not with Medicare.
  • Keep copies of all letters, bills, and notes about what happened — you will need them to prove your complaint.

The difference between a grievance and an appeal

A grievance is a complaint about something that already happened — a billing error, a rude staff member, a delay in processing, or a problem with your care. You file a grievance when you want Medicare or your provider to fix a problem or explain why something went wrong. Most grievances are resolved within 30 days.

An appeal is different. You file an appeal when Medicare or your plan has made a decision about your coverage — such as denying a test, refusing to pay for a procedure, or ending your coverage — and you disagree with that decision. Appeals have strict timelines and multiple levels, so the process takes longer. If you received a denial letter from Medicare or your plan, you are appealing, not filing a grievance.

When you call 1-800-MEDICARE, tell the representative what happened. They will ask questions to figure out whether you need to file a grievance or an appeal. If you are unsure, it is better to call than to guess — filing the wrong type can delay your resolution.

What you need before you file

Gather these documents before you call or file online: your Medicare card or claim number, the date the problem happened, the name of any provider or facility involved, and any letters or bills related to the issue. If Medicare or your plan sent you a denial letter, have that in front of you — it will have a case number and important date on it.

Write down a short description of what happened in your own words. You do not need to be formal or detailed — just explain the problem clearly enough that someone reading it would understand. For example: "I was billed $500 for a lab test that Medicare said it would cover" or "My doctor's office said Medicare denied my request for physical therapy, but I never received a denial letter."

If someone else is helping you — a family member, a social worker, or a patient advocate — have their contact information ready too. You can authorize them to speak with Medicare on your behalf, which can save time if you have trouble making phone calls.

How to file a grievance step by step

Step 1: Call 1-800-MEDICARE. Tell the representative you want to file a grievance. Have your Medicare card and a description of the problem ready. The representative will ask you questions about what happened and take down your information. This call usually takes 10 to 15 minutes.

Step 2: Confirm what you reported. At the end of the call, the representative will read back what they wrote down. Make sure it is correct. Ask them for a reference number and write it down — you will need it if you follow up later.

Step 3: Wait for a response. Medicare will investigate your grievance and send you a letter with the result. Most grievances are resolved within 30 days, though complex ones can take longer. The letter will explain what Medicare found and what action, if any, it is taking.

Step 4: Follow up if needed. If you do not hear back within 30 days, or if the response does not address your problem, call 1-800-MEDICARE again with your reference number. You can also file a second grievance if the first one was not resolved to your satisfaction.

How to file an appeal step by step

Step 1: Read your denial letter carefully. Medicare or your plan will send you a letter explaining why they denied your request. This letter will have a important date for filing an appeal — usually 60 days from the date on the letter. Write down this important date and do not miss it.

Step 2: Decide whether to appeal. You can appeal if you believe Medicare or your plan made a mistake, if new information has come to light, or if your doctor disagrees with the decision. If you are not sure whether an appeal is worth filing, call your doctor's office — they often have experience with appeals and can tell you whether they think it will succeed.

Step 3: File your appeal before the important date. You can file by phone (1-800-MEDICARE), by mail, or online at www.cms.gov. Include your Medicare claim number, the date of the denial, and a brief explanation of why you disagree with the decision. You can also include a letter from your doctor supporting your appeal. Mail appeals to the address on your denial letter.

Step 4: Wait for a decision. The first level of appeal (called a "redetermination") usually takes 30 days. If Medicare or your plan says no again, you can file a second appeal (called a "reconsideration"), which takes another 30 days. If you still disagree, you can request a hearing before an independent reviewer, though this takes longer.

When to ask for help filing

You do not have to file alone. A Patient Advocate Foundation or your local Area Agency on Aging can help you understand your options and file your complaint at no cost. You can find your local Area Agency on Aging by calling the Eldercare Locator at 1-800-677-1116.

Some hospitals and medical practices have patient advocates on staff who can help you file a complaint about that facility. Ask to speak with the patient advocate or ombudsman when you call. If you are in a nursing home or assisted living facility, ask for the facility ombudsman — they are required by law to help residents file complaints.

If your complaint involves a provider (a doctor, hospital, or clinic) rather than Medicare itself, you can also file a complaint with your state's medical board or health department. The representative at 1-800-MEDICARE can tell you whether your complaint should go to Medicare, your state, or both.

What happens after you file

After you file a grievance, Medicare will send you a letter explaining what it found. If Medicare agrees with you, it will fix the problem — refund a bill, correct a record, or take action against a provider. If Medicare disagrees, the letter will explain why and tell you whether you can appeal.

If you file an appeal and lose at the first level, you will receive a letter explaining the decision and telling you how to file a second appeal. Each level of appeal gives you another chance to present new information or a stronger argument. Many people win on appeal even after being denied the first time, especially if they include a letter from their doctor.

Keep all letters from Medicare or your plan in a folder. If you need to file another complaint or appeal later, these letters will help you explain what has already happened and why the problem is not resolved.

Frequently Asked Questions

How long do I have to file a complaint?

For a grievance about Original Medicare, you have one year from the date the problem happened. For an appeal of a coverage decision, you have 60 days from the date on your denial letter — this important date is strict, so do not wait. If you have a Medicare Advantage or drug plan, check your plan documents for the important date, as it may be different.

What if I disagree with a bill I received?

Call 1-800-MEDICARE and file a grievance about the billing error. Have your bill and Medicare Explanation of Benefits (EOB) in front of you. If the bill is from a provider, you can also call the provider's billing department directly and ask them to correct it — sometimes this is faster than going through Medicare.

Can I file a complaint about my doctor?

Yes, but it depends on what the complaint is about. If your doctor refused to treat you or was rude, file a grievance with Medicare. If your doctor made a medical error or you believe they provided poor care, you may also file a complaint with your state's medical board. Call 1-800-MEDICARE to find out which agency handles your specific complaint.

What if Medicare denies my appeal?

You can file another appeal at the next level, which goes to an independent reviewer instead of Medicare. If you lose that appeal too, you can request a hearing. At each level, include new information or a stronger argument from your doctor. Many people succeed on later appeals even after losing the first one.

Do I need a lawyer to file a complaint?

No, and most complaints are resolved without one. A lawyer can help if your case is complex or involves a lot of money, but you can file and win on your own. If you cannot afford a lawyer, ask the Area Agency on Aging or a patient advocate — they often help for free.