Medicare Denial vs. Adjustment: What's the Difference?

The Short Answer

• A denial means Medicare refused to pay for the service. You may be able to appeal.
• An adjustment means Medicare approved the claim but you owe a portion (like a deductible, coinsurance, or copay). This is standard cost-sharing and is not appealable.

The difference matters because it determines your next step. If it’s a denial, you have appeal rights. If it’s an adjustment, the question is whether the amount is correct.

How To Tell the Difference

It’s a denial if your notice says:

• “Claim denied” or “not approved”
• “This service is not covered”
• “Not medically necessary”
• “The time limit for filing has expired”
• A specific reason Medicare refused to pay

It’s an adjustment if your notice shows:

• “Deductible amount” or “applied to your deductible”
• “Coinsurance” — your percentage share of the cost
• “Copay” or “copayment”
• Medicare paid a portion and you owe the rest

What To Do

If it’s a denial: Find your specific denial reason in our Denial Guide to understand what happened and whether to appeal.

If it’s an adjustment: Verify the amount is correct. Check that the deductible, coinsurance, or copay matches your plan’s terms. If you have supplemental insurance (Medigap, Medicaid, employer coverage), it may cover some or all of your share. See our Patient Responsibility section for more details.

If the bill doesn’t match your Medicare statement: Your provider may have sent you a bill before Medicare finished processing the claim. This is a timing issue — and technically improper (providers should wait for Medicare to issue the EOB before billing you). Don’t pay the bill yet. Wait for your Medicare Summary Notice or Explanation of Benefits, compare the amounts, and call the provider’s billing office if they don’t match. This usually resolves in a single phone call. See our guide on Medigap crossover failures if your supplement didn’t pick up the remaining balance.

If you’re still not sure: Call 1-800-MEDICARE (1-800-633-4227) or contact your State Health Insurance Assistance Program (SHIP) for free help.

Sources

• Medicare.gov: Medicare Summary Notice
• Medicare.gov: Medicare Costs at a Glance

Frequently Asked Questions