Most people don’t read their medical bills—they panic over them. After all, receiving a multi-page statement full of confusing codes, unexplained charges, and unclear payment instructions isn’t just frustrating—it’s intimidating. I’ve worked with countless individuals who feel helpless in the face of these documents, unsure of what they owe, why they owe it, or whether the charges are even correct.

This confusion isn’t just common—it’s systemic. As a patient advocate and founder of Advonav, a health care navigation service based in Dayton, Ohio, I help patients take control of their care by starting with the basics: Understanding their own medical bills.

Here’s what every patient should know.

1. Your medical bill is not the same as your EOB.

One of the most frequent misunderstandings I see is the confusion between a bill from a provider and an Explanation of Benefits (EOB) from an insurance company.

The EOB is not a bill. It’s a summary from your insurance carrier showing:

• The services you received
• The amount your provider charged
• What your insurance covered
• What may be your responsibility

Too often, patients mistake the EOB for a demand for payment, which leads to unnecessary stress—or worse, double payment if they also receive a bill later. Understanding that the EOB is informational, not actionable, is the first step toward confidence.

2. Know what each line item means.

A medical bill typically lists:

• Date of service
• Service codes (CPT codes)
• Brief descriptions
• Charge amount
• Insurance payments or adjustments
• Balance owed

But these line items often lack plain language. Patients frequently ask, “What’s this charge for?” or “Why does it say I owe this if my insurance paid?”

In many cases, the problem isn’t what was charged—it’s how the billing was submitted. Claims submitted with incorrect codes, missing modifiers, or without required documentation are more likely to be denied or underpaid—errors that providers often pass down to patients.

3. Your insurance may not be billed correctly.

Another hidden issue behind confusing or excessive charges is incorrect insurance billing. Patients with multiple coverages (e.g., Medicare and a supplement, or dual commercial plans) may find their bill was sent to the wrong payer or in the wrong order. That alone can trigger a denial and shift the full balance to the patient—until it’s fixed.

Before paying any large medical bill, it’s worth confirming:

• The correct insurance was billed
• The filing order was followed (primary vs. secondary insurance)
• The authorization or precertification was obtained—because if not, and that responsibility fell on the provider, you may not be liable for the charge

4. The “facility fee” dilemma

Hospital-owned clinics can legally charge a facility fee in addition to the provider’s professional fee. Most patients are unaware of this until they receive two separate charges for a single visit: one for the doctor, and one for the building.

These fees are common—but they’re also avoidable in many cases. Patients may be able to reduce their out-of-pocket costs simply by choosing a private practice provider or asking in advance if a facility fee will be charged.

5. Don’t assume the bill is final.

You are not expected to blindly accept a medical bill as final. In fact, many are negotiable—especially when:

• You’re uninsured
• You were billed out-of-network
• You’re facing financial hardship
• You’ve identified a billing or coding error

Patients have the right to request an itemized bill, challenge charges, or ask for discounts—and many providers will work with you to adjust the balance or offer a payment plan.

6. When in doubt, ask for help.

Most patients aren’t trained in coding, billing systems, or insurance policies. And yet, we expect them to navigate the financial side of health care alone.

That’s where patient advocates come in:

• Understand their medical bills line-by-line
• Ensure claims are filed correctly
• Dispute denials and appeal insurance decisions
• Reduce out-of-pocket costs through negotiation and education

We exist because the system is too complex for most people to manage without support. And patients deserve more than confusion—they deserve clarity.

Decoding a medical bill shouldn’t require a background in health care administration. But until billing becomes more transparent and consistent, patients must remain vigilant—and empowered.

Understanding what your bill is (and isn’t), comparing it with your EOB, confirming that it was billed correctly, and seeking support when needed can make a real difference in what you pay—and how you feel about the care you receive.

Cheryl Spang is a patient advocate.