
How to Read Medical Bills & Identify Red Flags
Medical bills can feel long, confusing, and filled with unfamiliar terms.
This guide breaks each part down so you know what you’re being charged for, why, and what you can do next.
Table of Contents:
CLARIFY: Medical Bill vs. Explanation of Benefits (EOB)
A medical bill and explanation of benefits are NOT the same thing. This is one of the most common (and costly) misunderstandings.
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Explanation of Benefits (EOB)
An EOB is a notice sent by your health insurance company — it is not a bill!
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It explains:
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What services you received
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How much your insurance paid
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How much you may owe (AKA what you have to pay)
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You usually receive an EOB before you receive a medical bill.
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Learn how to read and use your EOB here.
Medical Bill
A medical bill comes from the provider or facility (hospital, clinic, doctor, lab) and tells you how much they are asking you to pay.
NOTE: If the information on your EOB doesn’t match your bill, you should contact your insurance company before paying anything.
Section-by-Section Guide: What’s on a Medical Bill?
Most medical bills include these core parts:
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Patient Information: Name, date of service, and account number
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Provider Information: Hospital, clinic, or physician name
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Services Provided: Procedures, tests, or visits listed with dates
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Charges: The original cost before insurance
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Adjustments: Discounts or insurance-negotiated reductions
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Insurance Payments: Amount paid by your insurer
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Patient Responsibility: What you may owe
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We will now Guide you through reading and understanding each of these.

Step 1: Identify Who Is Billing You
Medical care often involves multiple providers, meaning you may receive separate bills.
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Check for:
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Name and address of the provider or facility
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Whether the bill is from a hospital, doctor, lab, or imaging center
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Account number (you’ll need this for questions or payments)
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Step 2: Verify Personal & Service Information
Before looking at costs, confirm the basics:
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Your name (or dependent’s name)
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Dates of service (make sure you were actually treated on those dates)
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Location of care
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Length of stay (for hospital visits)
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Step 3: Request an Itemized Bill
Before reviewing costs in detail, request an itemized bill from the provider or hospital.
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Itemized bill: lists each service, test, medication, and supply separately, rather than grouping charges into a single total
Hospitals are required to send out itemized bills upon request within 30 days.
Requesting an itemized bill helps you:
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See exactly what you’re being charged for
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Identify duplicate or incorrect charges
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Compare services with your Explanation of Benefits (EOB)
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Ask informed questions about unclear items
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Learn how to Request an Itemized Bill Here.
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Step 3.5: Common Medical Billing Terms
Before reviewing the charges on your itemized bill, it’s important to understand a few key terms that appear on almost every medical statement.
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Deductible: What you pay before insurance starts covering costs
Copay: A fixed fee you pay for a visit or service
Coinsurance: Your percentage of the cost after insurance pays
Out-of-Pocket Maximum: The most you’ll pay in a year
Adjustment: A discount applied to the original charge
CPT Code: A standardized code describing the service performed
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Step 4: Understand the Charges on Your Itemized Bill
Now that you have an itemized bill, it’s time to break down the numbers.
On an itemized bill, you’ll usually see multiple cost columns. These are not all the same.
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Key Terms:
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Total Charges: The original (often inflated) price before insurance
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Allowed Amount: The maximum your insurance agrees to pay for a service
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Adjustments: Discounts applied by your insurance or provider
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Insurance Payment: What your insurance paid or will pay
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Patient Payment: Any copay or amount you already paid
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Balance Due / Patient Responsibility: What the provider says you still owe
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Step 5: Match the Itemized Bill to Your EOB
This is one of the most important steps — and one many people skip.
Compare:
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Dates of service
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Services listed (procedure names or CPT/HCPCS codes)
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Amount your insurance paid
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Amount listed as your responsibility
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Step 6: Review Services & Billing Codes & Check for Common Billing Errors
Each service or supply may be listed using:
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Descriptions
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Abbreviations
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CPT or billing codes: code describing the service performed
Medical billing errors are more common than people realize.
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Step 7: Compare Prices & Question High Charges
If a charge seems unusually high, you can compare it to typical prices in your area using public cost databases, such as: https://www.fairhealthconsumer.org/medical
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Step 8: Understand Out-of-Network & Surprise Charges
Sometimes bills are high because a provider was out of network, even if the hospital was in network.
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Know this:
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Out-of-network providers may charge more than your insurance’s allowed amount
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This difference is sometimes called balance billing
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Federal protections limit surprise billing in certain situations (like emergencies)
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Step 9: What If You Don’t Have Insurance?
If you’re uninsured or not using insurance:
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You are usually billed the full amount
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You have the right to ask for a Good Faith Estimate before care
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Step 10: If You Can’t Pay the Bill
You still have options — and asking early matters.
First, you can negotiate the bill, especially if uninsured
Then, you can ask the provider about:
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Payment plans (often interest-free)
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Apply for nonprofit or hospital aid programs
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Discounts for paying part of the bill upfront
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Many hospitals have financial counselors whose job is to help you explore these options.
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NOTE: If you don’t recognize the provider name, call the billing number listed and ask for clarification
RED FLAG: Being charged for an extra day or service you didn’t receive
NOTE:
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The “total charge” is not what most insured patients are expected to pay
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“Amount Due” is often negotiable — especially if you’re uninsured or underinsured
RED FLAG: If the itemized bill and EOB don’t match, do not pay yet. Call your insurance company first to ask why the numbers are different.
RED FLAG:
Look closely for:
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Duplicate charges
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Services you didn’t receive
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Cancelled tests or procedures still listed
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Vague descriptions
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Upcoding (use a more expensive billing code for a service than what was actually performed or warranted)
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Incorrect dates or providers
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Charges for supplies like gloves, gowns, or sheets (which should be under general costs)
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Brand-name drugs billed instead of generics
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Medicine charge if you brought your own medicine from home
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Extra zeros added to charges
TIP: If something looks unfamiliar or unclear, ask for an explanation. You are allowed to question every charge. If you find a mistake, contact the billing department and ask for a correction. Keep a record of who you spoke with and when.
TIP: If your bill is significantly higher than average, you can ask the provider for a lower or adjusted fee.
TIP: If you believe a charge is a surprise bill, contact the provider or your insurer and ask about your protections.
NOTE: If your final bill is $400 or more above the estimate, you may be able to dispute it.
NOTE: Do this before the bill goes to collections whenever possible.
Red Flags to Watch Out For
Here is a breakdown of all the red flags discussed:
Provider & Identity Issues
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A provider name you don’t recognize
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Multiple bills from different providers for the same visit without explanation
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Dates & Service Errors
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Services listed on dates you were not treated
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Being charged for an extra hospital day
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Charges for services after discharge
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Itemization & Transparency Issues
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A bill that only shows a lump-sum total with no itemization
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Refusal or delay when requesting an itemized bill
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Vague service descriptions
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Missing CPT or HCPCS procedure codes
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Insurance & EOB Mismatches
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The medical bill does not match your Explanation of Benefits (EOB)
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Insurance payments listed differently on the bill than on the EOB
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Charges appearing on the bill that were denied or not listed on the EOB
Duplicate or Inflated Charges
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Duplicate charges for the same service, test, or medication
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Extra zeros added to charges
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Services You Didn’t Receive
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Charges for tests or procedures that were cancelled
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Charges for services you did not receive or did not consent to
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Supplies & Medication Errors
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Charges for routine supplies such as gloves, gowns, or sheets
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Brand-name drugs billed when generics were provided
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Medication charges when you brought your own medication from home
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Coding Errors
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CPT or HCPCS codes that do not match the service provided
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Upcoding (billing a more expensive service than what was performed)
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Pricing Concerns
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Charges significantly higher than typical prices in your area
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Out-of-Network & Surprise Billing
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Out-of-network charges without clear explanation
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Balance billing without notice
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Emergency services billed at out-of-network rates
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Uninsured Billing Issues
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No Good Faith Estimate provided for uninsured patients
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Final bill that is $400 or more above the Good Faith Estimate
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Payment & Collection Pressure
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Pressure to pay immediately without review
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Threats of collections without offering payment plans or financial assistance
Watch This If You Need More Help



