Medical Billing FAQs: Your Guide to Understanding Healthcare Costs
This FAQ is an educational resource designed to help patients better understand medical billing, health insurance, and common financial responsibilities related to care. It provides general information only, and billing rules can vary by plan, provider, and location. For guidance specific to your situation, contact your healthcare provider’s billing office or your insurance company directly.
Understanding Your Explanation of Benefits (EOB)
What is an Explanation of Benefits (EOB)?
An Explanation of Benefits (EOB) is a document from your insurance company that explains how a claim was processed. It typically shows what your provider billed, what your plan considers the allowed amount, what the insurer paid, and what you may owe. The EOB may also include adjustments, denials, or notes about coverage rules. An EOB is not a bill, but it can help you understand what to expect on a bill from your provider.
How do I read my EOB?
Start by confirming the provider name and the date(s) of service match the care you received. Then review the amount billed, the allowed amount (the rate your plan recognizes), the insurance payment, and the patient responsibility (what you may owe). Many EOBs also list reason codes that explain reductions or denials, which can be helpful if something looks off. Compare the EOB to any bill you receive to make sure the amounts and services line up. If the bill doesn’t match the EOB, contact the provider’s billing office and/or your insurer to ask for clarification.
What should I do if my EOB shows a denied claim?
Look for the denial reason code or message on the EOB to understand why the claim was denied (for example, missing information, prior authorization requirements, or coverage limits). Next, contact your insurance company to confirm what is needed to reprocess the claim and whether an appeal is appropriate. You can also contact the provider’s billing office to ask if they can correct and resubmit the claim. For claim-specific steps and deadlines, follow your insurer’s instructions or speak with a representative for guidance.
Receiving and Understanding Medical Bills
What should I do when I receive a medical bill?
First, confirm the bill is for you (correct name, date of service, and provider) and that your insurance information is accurate. If you have insurance, check whether the provider billed your insurer and whether an EOB was issued for the same services. Compare the bill to your EOB to see if the patient responsibility matches and whether any adjustments were applied. Review the charges for possible errors, such as duplicate services or services you didn’t receive. If anything is unclear, contact the provider’s billing office and ask questions before paying, including requesting an itemized bill if needed.
Why did I receive a bill if I have insurance?
Having insurance does not always mean your plan pays 100% of the cost. You may owe a deductible (the amount you pay before coverage begins), a copay (a fixed fee), or coinsurance (a percentage of the cost). You may also receive a bill if a service was out-of-network, not covered, or required prior authorization that wasn’t obtained. If you’re unsure why you owe a balance, your EOB and your insurer can help explain how the claim was processed.
How long after my appointment should I expect a bill?
Many patients receive a bill within about 30–90 days, but timelines vary widely. Insurance processing, requests for additional information, and claim corrections can all delay billing. If it has been several months, you can contact the provider’s billing office to ask about the claim status.
Medical Billing Terms and Codes
What are CPT codes?
CPT codes (Current Procedural Terminology codes) are standardized codes used to describe medical services and procedures. They help providers and insurers communicate what care was performed for billing and claims processing. For example, a routine office visit or a specific lab test may each have its own CPT code.
What are ICD codes?
ICD codes (International Classification of Diseases codes) are standardized codes that describe diagnoses and health conditions. They help explain why a service was provided and support medical necessity for insurance coverage. For example, a diagnosis code may indicate a condition such as asthma or diabetes.
What is an NPI number?
An NPI (National Provider Identifier) is a unique identification number assigned to healthcare providers in the United States. It helps insurers and billing systems identify the provider or organization submitting a claim. You may see an NPI listed on medical bills, statements, or insurance claim documents.
What does “allowed amount” mean?
The allowed amount is the maximum amount your insurance plan will recognize for a covered service with a specific provider. It is often based on negotiated rates between the insurer and the provider (especially for in-network care). If the provider bills more than the allowed amount, the difference may be written off for in-network services, but rules can differ for out-of-network care.
Insurance Cost-Sharing: Deductibles, Copays, and Coinsurance
What is a deductible?
A deductible is the amount you pay for covered healthcare services before your insurance plan starts paying. For example, if your deductible is $1,500, you generally pay the first $1,500 of covered costs (with some exceptions, depending on your plan). After you meet the deductible, you may still owe copays or coinsurance until you reach your out-of-pocket maximum. Always check your plan details, because some services (like preventive care) may be covered before the deductible is met.
What is a copay?
A copay is a fixed amount you pay for a covered service, often at the time you receive care. For example, you might have a $30 copay for an office visit or a $10 copay for a generic prescription. Copays can vary by service type and whether the provider is in-network.
What is coinsurance?
Coinsurance is the percentage of costs you pay for a covered service after you’ve met your deductible. A common example is an 80/20 split, where the insurance plan pays 80% of the allowed amount and you pay 20%. If the allowed amount for a service is $1,000 and your coinsurance is 20%, your share would be $200 (assuming your deductible has been met). Coinsurance amounts can differ for in-network versus out-of-network care.
What is an out-of-pocket maximum?
An out-of-pocket maximum is the annual limit on what you pay for covered, in-network services under your plan. Once you reach that limit through deductibles, copays, and coinsurance, your insurance typically pays 100% of covered costs for the rest of the plan year. Premiums and non-covered services usually do not count toward this maximum.
Disputing Bills and Billing Errors
What are common medical billing errors?
Billing mistakes can happen, and reviewing your statements can help you catch them early. Common issues include duplicate charges, incorrect billing codes, charges for services you did not receive, or bills sent to the wrong insurance plan. Errors can also occur when dates of service, provider details, or patient information are incorrect. If something doesn’t look right, ask questions and request supporting documentation.
How do I dispute a medical bill?
Start by contacting the provider’s billing office and clearly explaining what you believe is incorrect. Whenever possible, follow up in writing (email or letter) so you have a record of your request and the dates you contacted them. Ask for an itemized bill and compare it to your EOB and any receipts or visit summaries you have. Provide copies of relevant documents and note specific line items you are disputing, rather than disputing the entire bill without details. Keep a log of phone calls, names, reference numbers, and copies of everything you send or receive. If the issue is complex or you feel stuck, you may consider seeking help from a patient advocate or a medical billing advocate.
What is an itemized bill and how do I get one?
An itemized bill lists each charge in detail, such as individual services, supplies, medications, and fees, rather than showing only a total balance. This can make it easier to spot errors or understand what you’re being charged for. You can request an itemized bill from the provider’s billing office, and patients are generally allowed to ask for this level of detail.
Surprise Billing and Patient Protections
What is surprise billing?
Surprise billing is an unexpected bill that can occur when you receive care from an out-of-network provider without realizing it. This can happen at an in-network hospital or facility if certain clinicians (such as anesthesiologists or radiologists) are not in your network. It can also occur during emergency care when you may not be able to choose where or from whom you receive treatment.
What protections exist against surprise billing?
In the United States, the federal No Surprises Act (effective in 2022) provides protections against many types of surprise bills. It generally limits what patients can be charged for emergency services and for certain non-emergency services provided by out-of-network clinicians at in-network facilities. In many cases, you should only be responsible for in-network cost-sharing amounts (like in-network copays or coinsurance). The law also includes a process for providers and insurers to resolve payment disputes without involving the patient. State laws may offer additional protections, and the rules can vary depending on your plan type and location.
What should I do if I receive a surprise bill?
Don’t pay immediately if you believe the bill may be protected under surprise billing rules. Review the bill and your EOB, and check whether the care was emergency-related or provided at an in-network facility by an out-of-network clinician. Contact your insurance company and the provider’s billing office to ask how the claim was processed and whether protections apply. If appropriate, you may be able to file a complaint through the relevant federal or state process; for steps specific to your plan and situation, contact your insurer for guidance.
Financial Assistance and Payment Options
What is charity care?
Charity care is free or discounted healthcare offered to patients who meet certain financial criteria. It is commonly available through nonprofit hospitals and some health systems, and it may apply to emergency and medically necessary care. Eligibility is usually based on income, household size, and other factors. Patients typically need to complete an application and provide documentation to be considered.
How do I apply for financial assistance?
Contact the hospital or clinic’s billing office or financial counseling department and ask about financial assistance programs. Request the application, eligibility guidelines, and a list of required documents (often proof of income, household size, and residency). Submit the application as soon as possible, especially if you have a payment deadline. If you need help completing forms, ask whether a financial counselor can walk you through the process.
Can I set up a payment plan for my medical bill?
Yes—many providers offer payment plans that allow you to pay over time, and some are interest-free. Contact the billing office to ask about available options and what monthly amount would be acceptable. It’s usually best to set up a plan before the account becomes past due or is sent to collections.
What is medical bill negotiation?
Medical bill negotiation is the process of asking a provider to reduce or adjust the amount you owe. This may be possible for large balances, for uninsured patients, or when you can demonstrate financial hardship. You can ask whether a prompt-pay discount, self-pay rate, or financial assistance option is available. In some situations, a medical billing advocate can help you review charges and negotiate on your behalf.
In-Network vs. Out-of-Network Providers
What does “in-network” mean?
In-network providers have a contract with your insurance plan that sets negotiated rates for services. Because of these agreements, your costs are usually lower when you use in-network doctors, hospitals, and facilities. In-network care is also more likely to count toward your plan’s deductible and out-of-pocket maximum under standard plan rules.
What does “out-of-network” mean?
Out-of-network providers do not have a contract with your insurance plan. As a result, your insurance may pay less (or sometimes nothing), and you may owe higher out-of-pocket costs. In some cases, you may also be billed for the difference between the provider’s charge and what your plan allows (often called balance billing), depending on the situation and applicable protections.
How can I find out if a provider is in-network?
Check your insurance company’s online provider directory, but keep in mind directories can sometimes be out of date. Call the insurance customer service number on your card to confirm network status for the specific provider and location. You can also ask the provider’s office which plans they participate in, but it’s still wise to verify with your insurer. If possible, confirm network status before scheduling appointments, tests, or procedures.
Why does it matter if I go out-of-network?
Out-of-network care can lead to higher bills because negotiated in-network discounts may not apply. Your plan may require higher coinsurance, a separate out-of-network deductible, or may not cover certain services at all. Depending on the circumstances, you may also face balance billing, where the provider bills you for amounts not paid by insurance. Additionally, some plans do not count out-of-network payments toward your in-network deductible or out-of-pocket maximum, which can increase your total costs.
Medical Debt and Credit Reporting
Can medical debt affect my credit score?
Yes, medical debt can affect your credit if an unpaid bill is sent to collections and then reported to credit bureaus. However, credit reporting rules and industry policies have changed in recent years, and patients may have more time before medical collections appear on credit reports. As of 2023, many medical debts are typically not reported until they are at least one year past due, though policies can vary. If you’re concerned, check your bills early and contact the provider to discuss payment options or assistance.
What should I do if my medical bill goes to collections?
First, confirm the debt is legitimate and matches your records, including dates of service and the provider name. Request a written validation notice from the collection agency so you understand what is being collected and by whom. If you believe the bill is incorrect, dispute it promptly and provide supporting documentation. If the debt is accurate, you may be able to negotiate a payment plan or settlement, and you should ask for any agreement in writing. In the U.S., you also have rights under the Fair Debt Collection Practices Act (FDCPA), which limits certain collection practices and gives you options for how collectors may contact you.
Can I remove medical debt from my credit report?
In some cases, yes—paid medical collections may be removed from credit reports, and some credit bureaus have specific policies related to medical debt. You can review your credit reports to see what is listed and whether the information is accurate. If you find errors, you can dispute them with the credit bureau and provide documentation. Because credit reporting rules can change and may depend on your situation, consider contacting the credit bureaus or a qualified professional for guidance specific to your circumstances.
Prior Authorization and Its Impact
What is prior authorization?
Prior authorization is approval from your insurance company that may be required before certain services, procedures, tests, or medications are covered. It is used to confirm that the requested care meets the plan’s coverage rules and medical necessity requirements. Without prior authorization, a claim may be delayed or denied depending on your plan.
What happens if I don’t get prior authorization?
If prior authorization is required and it isn’t obtained, your insurance company may deny the claim. That can mean you are responsible for some or all of the cost, even if the service would otherwise be covered. If you’re scheduling a procedure or starting a new medication, ask in advance whether prior authorization is needed. You can also call your insurer to confirm requirements and timelines.
Who is responsible for getting prior authorization?
Often, the provider’s office initiates and submits the prior authorization request because they have the clinical details the insurer needs. However, patients should still confirm that authorization was approved before receiving the service, especially for high-cost procedures or imaging. If you have questions, your insurer can tell you whether an authorization is on file.
Understanding medical billing can take time, and it’s normal to have questions as you review EOBs, bills, and insurance plan terms. You have the right to ask for clear explanations, request corrections, and explore options like itemized bills, payment plans, or financial assistance. For personalized guidance, reach out to your healthcare provider, your insurance company, or a patient advocate—this information is educational only and is not financial, legal, or medical advice.