A bill for a service the MSN shows as denied: what it means and what to do
A provider's bill for a service the Medicare Summary Notice shows Medicare denied — routes to the liability question (was a valid ABN given?), not a new appeal by itself.
What it means
A provider's bill for a service the Medicare Summary Notice shows Medicare denied — routes to the liability question (was a valid ABN given?), not a new appeal by itself.
A bill from a provider for a service your Medicare Summary Notice shows Medicare denied isn't a new appeal — it's a liability question, and it's one families win more often than they realize.
Under the limitation-on-liability rules, a family generally owes nothing for a denied service unless they were given a valid Advance Beneficiary Notice before it happened.
What this actually means for you
This is genuinely a letter to the provider, not an appeal to Medicare or your MAC — the MSN's own claims ladder isn't the right path for a liability dispute like this one.
If the provider already collected payment and it turns out no valid ABN was given, they generally have to refund what was collected — not just stop future billing — so it's worth asking for a refund directly, in writing, rather than assuming the issue only affects charges going forward.
A provider that keeps billing after being shown the MSN and told no valid ABN exists, without responding, is the point at which involving the Medicare Beneficiary Ombudsman or a consumer-protection resource becomes worth considering.
What to do
Check your MSN first. Confirm the bill matches a line the MSN actually shows as denied — not a separate deductible or coinsurance amount you do owe.
Find out if you signed an ABN. This is the single question that decides the bill: did you sign a valid Advance Beneficiary Notice before this specific service?
Write to the provider if you didn't. Without a valid ABN, the provider generally can't collect from you and must refund anything already collected — a letter to the provider, not an appeal to Medicare, is the right next step.
Keep a copy of everything. Keep the bill, the MSN, and any ABN (or the lack of one) together — you may need them again if the bill doesn't stop.
If the bill goes to collections
A bill in collections while the ABN question is still unresolved is worth getting real help with — see what to do if a bill goes to collections.
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By CaseWhy Appeals editorial. See how this content is produced. Not legal advice. Not affiliated with or endorsed by Medicare, CMS, or any health plan. A product of CaseWhy LLC.