Medigap Plan N Denied Your Claim: What It Covers and What It Doesn't

What This Means

Medigap Plan N is a Medicare Supplement policy that covers most of your Original Medicare cost-sharing — but not all of it. If you received an unexpected bill after using Plan N, it likely reflects one of the plan’s built-in cost-sharing features: a small copay for office visits or emergency room trips, or an “excess charge” from a provider who doesn’t fully accept Medicare’s rates. Less commonly, the bill may reflect a processing error that can be corrected.

Why This Happens

• Plan N has office visit and ER copays by design. Plan N covers the Part B coinsurance but leaves you responsible for up to around $20 per office visit and up to around $50 per emergency room visit that does not result in a hospital admission. These are not errors — they are part of the plan’s structure.
• Plan N does not cover Part B excess charges. When a provider is “non-participating” (they have not agreed to accept Medicare’s approved amount as payment in full), they may legally bill up to 15% above that amount. Plan N does not cover this gap. If your provider does not accept Medicare assignment, you may owe that difference out of pocket.
• A crossover claim may not have processed correctly. Medicare is supposed to automatically forward your claim to your Medigap insurer — this is called a crossover claim. If that transfer fails, your insurer may not know the claim exists, and you could receive a bill that Plan N should have already handled.
• The provider may have billed above the Medicare-approved rate incorrectly. Providers who do accept Medicare assignment cannot charge excess amounts. If one did, that overcharge may be a billing error, not a legitimate patient responsibility.
• The Part B deductible may not have been met yet. Plan N does not cover the annual Part B deductible (check medicare.gov for the current year’s amount). If you haven’t met it yet, you’ll owe that portion before Plan N’s coverage kicks in.

Should You Appeal?

What To Do Next

1. Review your Medicare Summary Notice (MSN). Your MSN — the statement Medicare mails quarterly, or that you can view anytime at medicare.gov — shows what Medicare approved, what it paid, and what it sent to your Medigap insurer. Confirm the service is listed and that the approved amount looks correct.
2. Contact your Medigap insurer. Call the member services number on your Plan N card and ask whether the claim was received and processed. If the crossover never happened, ask them to reprocess it with the Medicare MSN in hand.
3. Check the provider’s Medicare participation status. Ask your provider’s billing office whether they accept Medicare assignment. If they do, they cannot charge excess amounts above Medicare’s approved rate. If a participating provider billed excess charges, request a corrected bill.
4. Request an itemized bill from your provider. This shows every charge by service and code. Compare it against your MSN to confirm the billed amounts match what Medicare approved.
5. File a redetermination if you believe Medicare processed something incorrectly. A redetermination — Medicare’s first level of formal appeal — must be requested within 120 days of the date on your MSN. You can file by mail or through your Medicare account at medicare.gov.
6. If you’d like help reviewing your bill or identifying whether a charge looks like an error, Barley can do a free bill analysis. Check My Bill for Free.

Sources

• Medicare.gov: Medigap Plan N benefits — official plan benefit comparison, including Plan N copays and what is not covered
• Medicare.gov: Medicare excess charges — explanation of non-participating providers and the 15% excess charge limit
• CMS: Crossover Claims — how Medicare forwards claims to Medigap and secondary insurers
• Medicare.gov: How to appeal a Medicare decision — redetermination process and deadlines for Original Medicare appeals

Frequently Asked Questions