CJ Karrer
Writer · Reviewed by Richard ChanUpdated Jun 12, 2026
3 min read
Original Medicare has several "gaps" in coverage, meaning it does not pay for deductibles, copayments, and coinsurance, leaving beneficiaries with out-of-pocket costs.
Medicare also does not cover most dental, vision, or hearing care, nor does it cover long-term custodial care.
Beneficiaries frequently purchase Medicare Supplement (Medigap) insurance or enroll in Medicare Advantage plans to help cover these financial and service gaps.
No health insurance plan covers everything — and understanding where your coverage ends is just as important as knowing where it begins. Gaps in Coverage are the moments when your insurance plan doesn't fully pay, or doesn't pay at all, leaving you responsible for costs you may not have anticipated. For Medicare beneficiaries especially, these gaps can catch people off guard: Original Medicare leaves meaningful financial exposure through deductibles, coinsurance, and entire categories of care it simply doesn't cover. Being prepared for those gaps — before you're sitting in a doctor's office or receiving an unexpected bill — is essential financial self-defense.
Several factors contribute to Gaps in Coverage:
Gaps in Coverage can have significant implications for policyholders:
To navigate Gaps in Coverage effectively, policyholders should:
Gaps in Coverage are an unavoidable reality of how health insurance works — but they don't have to be devastating surprises. The more familiar you are with the specific terms of your plan, the better positioned you are to make choices that minimize your exposure. For Medicare beneficiaries, supplemental coverage options like Medigap plans or Medicare Advantage can help fill the most significant financial gaps that Original Medicare leaves open. Proactively understanding your plan's limitations — including which services aren't covered at all — is the foundation of smart healthcare financial planning, and it can genuinely protect your peace of mind when you need care most.