Why Is Medicare Not Paying My Claims
Medicare doesn't pay a claim when something about it doesn't match what Medicare requires, and the fix depends on finding out exactly what that is.
Medicare is rejecting the claim for a specific reason, not at random
Start with the Medicare Summary Notice or the explanation of benefits from your plan. It will list a reason code or a short explanation for why the claim wasn't paid. That notice is the actual answer to your question, and nothing else will tell you as precisely what happened.
Most unpaid claims come down to a handful of causes. The provider isn't enrolled in Medicare or billed it incorrectly. The service isn't covered the way it was coded. You have a Medicare Advantage plan instead of original Medicare, and the plan has its own rules about referrals or networks. Or the claim hasn't finished processing yet and what looks like a denial is just a delay.
Whether you have original Medicare or a Medicare Advantage plan changes everything
If you have original Medicare, the provider bills Medicare directly, and claims are usually paid on a predictable schedule as long as the service is covered and billed correctly. A denial here usually means a coding problem, a coverage problem, or a provider who isn't set up correctly with Medicare.
If you have a Medicare Advantage plan, the plan is paying the claim, not Medicare directly, and the plan can require things original Medicare doesn't. A referral you didn't get. A network restriction. Prior authorization that wasn't filed before the service happened. Check which kind of coverage you have before you assume the problem is the same one your neighbor had.
If you're not sure which you have, your Medicare card or your plan's member card will say. That's the first thing to check before calling anyone.
How the claim was coded matters as much as what service you received
A service that Medicare covers can still be denied if it was billed under the wrong code, billed as a different service than what happened, or missing information the provider was supposed to include. This is extremely common and it is the provider's error to fix, not yours.
Call the provider's billing office before you call Medicare. Ask them to confirm how the service was coded and whether they've resubmitted anything. Billing offices correct and resubmit claims regularly, and a second submission with the right code is often all it takes.
If the provider insists the coding was correct and Medicare still won't pay, ask them directly whether the service is one Medicare covers in your situation. Some services need documentation showing they were medically necessary, and that paperwork has to come from the provider.
Questions people ask about this
How long does Medicare usually take to process a claim?
Timing varies by how the claim was submitted and by your plan, so check your Medicare Summary Notice for the date the claim was received before assuming it's denied. A claim that's still processing isn't the same as one that's been rejected.
What do I do if Medicare denies a claim I think should be covered?
You can file an appeal, and the Medicare Summary Notice explains how and where to send it. Keep a copy of the notice and any paperwork from your provider, since you'll likely need to reference the specific reason given for the denial.
Why would Medicare deny a claim from a doctor I've seen for years?
Seeing the same doctor doesn't guarantee the same outcome if something changed on the billing side, like a new code for the service or a lapse in how the provider is enrolled with Medicare. Ask the billing office what changed since your last visit.
Does a Medicare Advantage plan deny claims more often than original Medicare?
The two work differently rather than one being stricter across the board, since Advantage plans apply their own network and authorization rules on top of Medicare's coverage decisions. Check your plan's specific rules on referrals and prior authorization before a denial surprises you.
Who do I call first when a Medicare claim doesn't get paid?
Call the provider's billing office first, since most denials trace back to how the claim was submitted. If the provider confirms the billing was correct and the service should be covered, that's when to call Medicare or your plan directly.
If a denied claim has you rethinking your coverage, see how your options compare.
Pull your most recent Medicare Summary Notice or plan explanation of benefits and find the specific reason listed for the unpaid claim. Call your provider's billing office with that reason in hand and ask whether the claim was coded correctly and whether it's been resubmitted. If you have a Medicare Advantage plan, separately check whether the service needed a referral or prior authorization you didn't have. Keep every notice and call date written down, since you'll need them if you end up filing an appeal. If the provider says everything was done right and Medicare still won't pay, ask them to help you understand why before you spend time on the phone with Medicare yourself.
