Does Medicare Send Claims to Secondary Insurance
In most cases yes, but it depends on whether your secondary plan has an agreement with Medicare to receive claims automatically.
Yes, if the crossover is set up
Medicare can send your claim information straight to your secondary insurance after it pays its share. This is called a crossover claim, and it happens automatically when your secondary insurer has registered with Medicare's crossover system and you've given Medicare permission to share your claim data.
This isn't guaranteed for every plan. Some secondary insurers, including some Medigap plans and retiree plans, aren't set up for crossover at all. In that case you or your doctor's office has to send the claim to the secondary insurer yourselves, usually with the Medicare Summary Notice attached.
What kind of secondary coverage you have
Medigap plans are the most likely to have crossover working automatically, because most Medigap insurers register for it specifically so their policyholders don't have to file a second claim.
Employer retiree coverage and union plans are less consistent. Some are set up for crossover and some expect you to submit the claim yourself. There's no way to know without asking your plan directly.
Medicaid, when it's your secondary coverage, generally does receive crossover claims from Medicare, since this is built into how the two programs coordinate for people who qualify for both.
If you have a plan through a former employer, ask the benefits office or the insurer whether they're part of Medicare's crossover program, and whether you need to do anything to opt in.
What most people get wrong about it
People assume that because Medicare paid its part, the rest is handled. It often is, but not always, and the only way to know for certain is to look at your secondary insurer's explanation of benefits after a claim, not just the Medicare Summary Notice.
A common mistake is not checking that the crossover information Medicare has on file is current. If you switch secondary plans or your Medigap policy number changes, the old crossover arrangement may no longer apply, and claims can stop transferring without anyone telling you.
Another thing people miss is that even with crossover working, there can be a delay between when Medicare processes a claim and when the secondary insurer receives and pays it. If a bill arrives before that happens, call the provider's billing office before paying it, since the secondary payment may still be coming.
Questions people ask about this
How do I know if my Medicare claim was sent to my secondary insurance?
Check your Medicare Summary Notice. It will show whether the claim was forwarded to a secondary payer. If it doesn't mention your secondary insurer, call them directly to confirm whether they received it.
What do I do if Medicare didn't send my claim to my secondary insurer?
You or your provider's office will need to submit the claim to the secondary insurer directly. Ask the provider's billing department if they can do this, since many are set up to file secondary claims on a patient's behalf.
Does Medigap always receive crossover claims automatically?
Most Medigap insurers participate in crossover, but not all of them do for every plan. Ask your Medigap insurer whether your specific policy is registered for automatic crossover with Medicare.
Why did my secondary insurance deny a claim Medicare already paid?
This can happen if the secondary insurer has different coverage rules than Medicare, or if the crossover information on file is outdated. Contact the secondary insurer to find out the specific reason listed on their explanation of benefits.
Do I need to tell Medicare about my secondary insurance for crossover to work?
Yes, Medicare needs accurate, current information about your other coverage for crossover to function. If you've changed secondary insurers recently, update this with Medicare through the Benefits Coordination and Recovery Center.
Before you assume it's handled, it helps to know exactly how your current coverage coordinates with Medicare.
Call your secondary insurer this week and ask directly whether they're set up for automatic crossover with Medicare. Have your Medicare card and your policy number ready. If they say yes, ask how long claims typically take to arrive after Medicare processes them, so you know what's normal. If they say no, ask what you need to submit and whether your provider's office can do it for you. Either way, keep an eye on your Medicare Summary Notices for a few months to confirm the claims are actually going through.
