Costly Assumptions People Make When Using Their Health Insurance

Insurance Basics Editorial Team Staff Writer · Feb 28, 2024 · 5 min read

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From skipping pre-authorization to missing claim deadlines, these are the misunderstandings that lead to denied claims and surprise bills.

Key Takeaways

Assuming your doctor is in-network without verifying can result in significantly higher out-of-pocket costs.
Skipping pre-authorization for required procedures is one of the most common reasons claims get denied.
Your deductible and out-of-pocket maximum are separate figures — confusing them can distort your cost expectations.
Missing insurer-imposed claim filing deadlines can make otherwise valid claims unrecoverable.
An Explanation of Benefits is not a bill, but ignoring it can mean missing billing errors or denials.

Why Health Insurance Assumptions Are So Costly

Health insurance is designed to protect you financially — but its value depends heavily on how well you understand its rules. Many people enroll in a plan, receive a card in the mail, and assume that showing up to a doctor's office is all it takes. In practice, the gap between what policyholders expect and what their plan actually covers can translate directly into hundreds or thousands of dollars in unexpected bills.

These aren't obscure technicalities buried in fine print. They're everyday misunderstandings that affect how, when, and from whom you seek care. The good news is that most are avoidable once you know where to look. For a broader look at common misconceptions, see what people commonly get wrong about health insurance.

Assuming your current doctor is automatically in-network with a new plan.

Why it happens: Provider directories can feel overwhelming, and many people assume continuity of care means continuity of coverage. When switching employers or plans, it's easy to presume your existing relationships carry over.

How to avoid: Call your doctor's billing office directly and confirm they accept your specific plan — not just the insurer — before scheduling. Insurer online directories can lag behind reality, so a phone call is the most reliable verification.

Skipping pre-authorization for procedures that require it.

Why it happens: Patients often assume that if a doctor recommends a procedure, the insurance will follow. The clinical and administrative sides of healthcare operate separately, and many plans require prior approval — called pre-authorization or prior auth — before covering certain services.

How to avoid: Before any non-emergency procedure, imaging, or specialist referral, ask your provider's office whether pre-authorization is required and confirm they have submitted it. Get the authorization number in writing before your appointment date.

Confusing the deductible with the out-of-pocket maximum.

Why it happens: Both figures appear on your Summary of Benefits and Coverage, and both represent money you might pay — but they work differently. People sometimes budget only up to the deductible amount and are blindsided by coinsurance and copays beyond that point.

How to avoid: Understand that the deductible is what you pay before most coverage kicks in, while the out-of-pocket maximum is the ceiling on your total annual spending. Once you hit the maximum, the plan typically covers 100% of covered services for the rest of the year. If you have a high-deductible plan, understanding HDHP tradeoffs can help frame these costs.

Filing a claim or appeal after the plan's deadline has passed.

Why it happens: Most people don't know their insurer has a filing window — often 90 to 180 days from the date of service — and assume they can address billing issues whenever it's convenient. By the time a dispute surfaces, the window may be closed.

How to avoid: Check your plan documents for claim submission and appeal deadlines. If you receive a denial, note the appeal deadline on your EOB immediately and begin gathering documentation. Missing an appeal window is one of the few situations with almost no recourse.

Using an out-of-network emergency facility and assuming balance billing won't apply.

Why it happens: Federal protections under the No Surprises Act limit certain surprise bills from emergency care, but gaps and exceptions remain. Many patients aren't aware of what protections apply or how to invoke them.

How to avoid: After any emergency visit at an out-of-network facility, review your EOB carefully and check whether the No Surprises Act protections apply to your situation. If you receive a bill that seems inconsistent with those rules, contact your insurer's member services and request an itemized bill from the provider.

Reading Your Benefits Documents — Don't Skip This Step

After a medical visit, your insurer sends an Explanation of Benefits (EOB) — a summary of what was billed, what the plan paid, and what you may owe. Many people mistake it for junk mail or assume it's the same as the provider's bill. It isn't. Your EOB is the single most reliable tool for catching billing errors, verifying that claims were processed correctly, and understanding why a service was denied.

~$2,500

Average surprise medical bill amount

Research published in health policy journals has found that unexpected out-of-network bills frequently exceed $2,000, often triggered by a provider the patient didn't choose directly.

1 in 5

Emergency visits resulting in a surprise bill

Studies analyzed by the Kaiser Family Foundation found that roughly one in five emergency room visits resulted in at least one out-of-network charge, even when the facility itself was in-network.

Review every EOB when it arrives and compare it against any bill your provider sends. If the amounts don't match, contact your insurer before paying. For a detailed walkthrough of what each section means, see reading an Explanation of Benefits without getting lost.

Claim Deadlines Are Rarely Extended

Most health plans impose strict timelines for submitting claims and filing appeals — often as short as 90 days from the date of service. Once a deadline passes, insurers are generally not required to reconsider the claim, even if the underlying care was clearly covered. Set a reminder to review your EOB and any provider bills within days of receiving them, not weeks.

This article provides general information about health insurance concepts and is not a substitute for personalized advice from a licensed insurance professional. Coverage terms, costs, and rules vary significantly by plan and state. Always consult your plan documents and a qualified insurance adviser for guidance specific to your situation.

Insurance Basics Editorial Team

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