Medicare Supplement Plan G Deductible: What You Still Owe

What This Means

If your husband has Original Medicare and a Medigap Plan G supplement, he has strong coverage — but there is one cost Plan G does not pay: the annual Medicare Part B deductible. Once that deductible is met for the year, Plan G typically covers the 20% coinsurance that Original Medicare leaves behind, so most approved services cost nothing out of pocket after that point. A remaining balance usually means one of three things: the Part B deductible hasn’t been fully met yet, the claim didn’t transfer correctly to Plan G, or there’s a billing error worth looking into.

Why This Happens

• The Part B deductible wasn’t fully met yet. Plan G covers nearly everything except the Part B deductible (check Medicare.gov for the current year’s amount). Until that annual amount is paid in full, providers can bill for the remainder. Once it’s met, it resets the following January 1.
• 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?

What To Do Next

1. Pull the Medicare Summary Notice (MSN). The MSN is the statement Medicare mails every three months 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.
2. Check the Part B deductible status. Your husband’s MSN will show how much of the Part B deductible has been applied so far this year. If it hasn’t been fully met, the remaining balance is legitimate until it is.
3. 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.
4. 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.
5. 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.
6. 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.

Frequently Asked Questions