Medicare Supplement Plan G Deductible: What You Still Owe
Does any of this sound familiar?
"My husband has Original Medicare and Plan G, and we still got a bill"
"He already met his deductible ... why do we owe anything?"
"Plan G is supposed to cover almost everything, so what is this charge?"
If so, this page explains exactly what Plan G covers, what the Part B deductible means, and how to tell if a remaining balance is legitimate.
What This Means
If your husband has Original Medicare and a Medigap Plan G policy, first check which version of Plan G he has. With standard Plan G, the annual Part B deductible remains his responsibility; the policy generally covers Part B coinsurance after that. High-deductible Plan G works differently: he must pay up to $2,950 in 2026 in Medicare-covered costs before the policy pays. Meeting the Part B deductible alone does not meet that larger threshold. Medicare’s plan comparison explains both versions.
Why This Happens
- The relevant deductible has not been met. Standard Plan G does not pay the Part B deductible. High-deductible Plan G also requires you to meet its separate threshold for Medicare-covered costs before it pays. Check your policy and insurer’s deductible record before treating a remaining balance as a billing error.
- The claim didn’t cross over to Plan G automatically. A crossover claim is when Medicare forwards a processed claim directly to the Medigap insurer. When this electronic handoff fails, Plan G may not know the claim exists — and won’t pay its share until the insurer is notified.
- The service may not be covered under Medicare. Plan G only pays what Medicare has already approved. If Medicare denied the service or called it non-covered, Plan G typically won’t pay either. The Medicare Summary Notice (MSN) — the statement Medicare mails after processing a claim — will show whether the service was approved.
- The provider billed the wrong amount. Billing errors do happen. If the provider’s bill shows a larger balance than the MSN suggests your husband owes, the numbers may not match because of a coding mistake or a duplicate charge.
- Plan G wasn’t yet active when the service occurred. If coverage started mid-year, services before the effective date wouldn’t be covered by the supplement, even if the deductible has since been met.
Should You Appeal?
Appeal outlook: Not applicable
This is not a Medicare denial, so there is nothing to appeal with Medicare directly. Plan G is a private insurance product, and any dispute about what it paid goes to the Medigap insurer, not Medicare. If the underlying Medicare claim was denied, that denial can be appealed separately. But if Medicare approved the service and Plan G simply hasn’t paid, the right move is to contact your husband’s Medigap insurer and, if needed, your state’s insurance commissioner. A clear paper trail — the MSN, the Explanation of Benefits from Plan G, and the provider’s itemized bill — is your strongest tool.What To Do Next
- Pull the Medicare Summary Notice (MSN). The MSN is the statement Medicare mails every 6 months if you had any services or supplies, or, if you sign up for electronic MSNs, an email for any month you have a processed claim, summarizing what was billed, what Medicare approved, what Medicare paid, and what you owe. Compare the “Patient Responsibility” amount on the MSN to what the provider is charging. If they don’t match, the bill may be wrong.
- Check both the policy type and deductible status. Use the MSN to check how much of the Part B deductible has been applied. If he has high-deductible Plan G, also ask the insurer how much has counted toward its $2,950 threshold for 2026. A balance can be legitimate, but confirm the claim and calculation before paying.
- Contact Plan G’s insurer directly. Ask whether the claim was received and processed. If the crossover failed, the insurer can request the claim from Medicare or accept a copy you submit. Have the MSN and the provider’s itemized bill ready when you call.
- Request an itemized bill from the provider. An itemized bill lists every charge by service and billing code. If a charge doesn’t match what’s on the MSN, or if you see services your husband didn’t receive, ask the provider’s billing department to review it.
- Contact 1-800-MEDICARE (1-800-633-4227) or your State Health Insurance Assistance Program (SHIP). SHIP counselors are free, unbiased, and trained specifically to help Medicare beneficiaries sort out billing problems between Original Medicare and Medigap plans. Find your local SHIP at shiphelp.org.
- If you’d like help reviewing the bill before paying it, Barley can look for errors between what Medicare approved, what Plan G should have paid, and what you’re actually being charged. Check My Bill for Free.
Sources
- Medicare.gov: Compare Medigap plan benefits — standard Plan G benefits and the high-deductible option, including the 2026 threshold.
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Frequently Asked Questions
Does Plan G cover the Medicare Part B deductible?
No. Standard Plan G generally pays the Part B coinsurance after the Part B deductible is met. High-deductible Plan G has a separate threshold — $2,950 in 2026 for Medicare-covered costs — before the policy pays. Check which version you have.
My husband met his deductible. Why is there still a balance?
First check whether he has standard or high-deductible Plan G. High-deductible Plan G can leave additional cost-sharing after the Part B deductible. With either version, also check coverage dates, whether Medicare covered the service, and whether the supplement received and processed the claim.
What does 'crossover claim' mean?
A crossover claim is when Medicare automatically forwards the claim to the Medigap insurer after processing. If this fails, Plan G may not have paid its share yet.
How do I know if the bill is a mistake?
Compare the provider bill to the Medicare Summary Notice (MSN). If the amounts do not match or Plan G's payment is missing, contact the provider and the Medigap insurer.
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This information is for educational purposes only and is not legal or medical advice. Always verify with your doctor's office and insurance company.