How to Understand Your Explanation of Benefits (EOB) and What to Do Next

How to Understand Your Explanation of Benefits (EOB) and What to Do Next

You just had a chiropractic adjustment or a physical therapy session, and a few weeks later a document arrives from your insurance company. It's dense, full of columns and codes, and it might look alarming — but before you reach for your wallet, stop. This document is almost certainly an Explanation of Benefits, and it is not a bill. This guide walks you through exactly what every field means, why your visit may have been denied, and the steps to take after it arrives.

What Is an Explanation of Benefits — and Why It Is Not a Bill

An Explanation of Benefits (EOB) is a summary document your health insurance company sends after it processes a claim from your provider. It explains how the claim was handled — what your insurer allowed, what it paid, and what portion (if any) may eventually be your responsibility.

An EOB is not a request for payment. No money is due to your insurer based on an EOB. If an amount is owed to your chiropractor or physical therapist, you will receive a separate bill from their office. Treating an EOB like an invoice is one of the most common patient mistakes — and it's completely understandable, because the documents can look official and urgent.

Keep every EOB you receive. They serve as your personal record of how your insurance is being applied and are especially important if you ever need to dispute a charge or compare an EOB against a bill.

{{screenshot: Sample EOB document with key sections highlighted — Billed Amount, Allowed Amount, Plan Paid, and Patient Responsibility columns circled}}

The Six Fields Every EOB Contains (and What They Actually Mean)

Learning how to read an EOB from your insurance company is mostly a matter of knowing what each column is tracking. Most EOBs for chiropractic or physical therapy visits include these six fields.

Billed Amount

This is the full charge your provider submitted to the insurer — sometimes called the "chargemaster" or "list" rate. It is rarely the amount anyone actually pays. Think of it as the starting number before any insurance contract adjustments are applied.

Allowed Amount (and Why It Differs from the Billed Amount)

If your provider is in-network, your insurer has a pre-negotiated rate for each service. The allowed amount is that agreed-upon rate. It is almost always lower than the billed amount. Out-of-network providers may not have a negotiated rate, which can significantly change how the rest of the columns calculate.

Plan Adjustment or Write-Off

This is the difference between the billed amount and the allowed amount. In-network providers are contractually required to write off this amount — it is not a debt you owe and not a discount applied as a favor. It simply disappears from the calculation.

What Your Plan Paid

After the write-off, your insurer pays its share of the allowed amount. This figure reflects your specific plan's benefit structure — the percentage your plan covers after the deductible and any coinsurance thresholds are applied.

Deductible, Copay, and Coinsurance Applied

Your plan may apply part of the allowed amount toward your annual deductible before it pays anything. After the deductible is met, coinsurance (a percentage split between you and the plan) may apply. A copay is a flat fee due at the time of service. Some visits involve all three; some involve only one. Your EOB will show exactly which were applied and in what amount.

Patient Responsibility — the Only Number That May Require Action

This is the amount you may owe your provider after your insurer has processed the claim. It is the sum of any deductible applied, your coinsurance share, and any copay. This is the only number on an EOB that could translate into a payment due — and only after you receive an actual bill from your provider's office confirming it.

A Walk-Through Example: Reading an EOB from a Chiropractic or Physical Therapy Visit

The following is a fictional example created for illustration only. All names, numbers, and details are invented.

Fictional patient: Jane Smith
Provider: Fictional Chiropractic Clinic (in-network)
Services: Three visits — spinal manipulation (CPT 98940) and therapeutic exercise (CPT 97110)

{{screenshot: Fictional EOB table showing the columns described below with sample dollar amounts populated}} Service Billed Allowed Write-Off Plan Paid Deductible Applied Patient Responsibility 98940 – Spinal Manipulation (x3) $210.00 $135.00 $75.00 $94.50 $0.00 $40.50 97110 – Therapeutic Exercise (x3) $240.00 $150.00 $90.00 $0.00 $150.00 $150.00 Totals $450.00 $285.00 $165.00 $94.50 $150.00 $190.50

Reading this EOB: The clinic billed $450. After the in-network write-off of $165, the allowed amount was $285. Jane had $150 remaining on her deductible, which was applied entirely to the therapeutic exercise charges — meaning the plan paid $0 on that line. On the spinal manipulation line, her plan covered 70% of the allowed amount after the deductible was already met, so the plan paid $94.50 and Jane's share is $40.50. Her total patient responsibility is $190.50, but she will not pay this until her provider's office sends an actual bill.

EOB codes for chiropractic treatment — the short alphanumeric codes in a separate column — explain each adjustment. Common examples include codes indicating "contractual adjustment" (the write-off) or "applied to deductible." Your EOB's key or legend, usually printed at the bottom, defines each one.

EOB Quick-Reference Glossary

Allowed Amount The maximum your insurer will consider for a given service under your plan's pricing agreement. Billed Amount The full charge your provider submitted before any insurance adjustments. COB (Coordination of Benefits) The process used when a patient has more than one insurance plan to determine which pays first (primary) and which pays second (secondary). Deductible The amount you pay out of pocket each plan year before your insurance begins sharing costs. EOB (Explanation of Benefits) A summary from your insurer showing how a claim was processed. Not a bill. Explanation Code An alphanumeric code on the EOB that explains why a claim was adjusted, denied, or paid at a specific rate. Each code is defined in the EOB's legend. In-Network vs. Out-of-Network In-network providers have a contract with your insurer; out-of-network providers do not. Using out-of-network care typically results in higher patient responsibility. Patient Responsibility The portion of the allowed amount that remains after the plan has paid its share. This is what you may owe your provider. Plan Adjustment (Write-Off) The amount subtracted from the billed charge because it exceeds the allowed amount. In-network providers cannot bill you for this difference. Remittance A related document sent to the provider — not the patient — detailing the payment from the insurer. Patients receive the EOB; providers receive the remittance advice.

If You Are in a Personal-Injury or Workers' Compensation Case

The explanation of benefits for a personal injury case works differently than standard commercial insurance — and in some situations, you may not receive an EOB at all.

Personal-injury patients whose treatment is covered under a letter of protection or medical lien arrangement typically do not submit claims through their health insurer. Instead, the provider agrees to defer billing until the legal case is resolved. In this situation, there is no insurance claim to process, so no EOB is generated.

Workers' compensation patients have claims handled by a workers' comp insurer rather than a health plan. The EOB versus workers' compensation billing difference is meaningful: workers' comp payers use their own fee schedules, their own forms, and their own adjudication processes. Standard health-plan EOB logic — deductibles, coinsurance, plan adjustments — may not apply in the same way.

If you are in either situation and have questions about what documents you should expect or what amounts may be your responsibility, speak with both your provider's billing office and your attorney. Treatment cost coverage in these cases may depend on the outcome of a third-party claim or settlement, and those details vary significantly. This article provides general background only — your specific situation may work quite differently.

Why Was My Chiropractic or Physical Therapy Visit Denied?

A denial on your EOB doesn't necessarily mean your insurer has made a final decision. Understanding why the claim was denied is the first step toward knowing your options.

Common denial reasons for conservative-care visits include:

• Medical necessity: The insurer determined that the service did not meet its clinical criteria for coverage. "Insurance denied physical therapy — not medically necessary" is one of the most frequent explanations patients see. This is often the most appealable denial type, particularly when your provider can supply clinical documentation.
• Visit-limit exhaustion: Many plans cap the number of covered chiropractic or PT visits per year. Once that limit is reached, additional visits may be denied automatically.
• Missing referral or prior authorization: Some plans — particularly HMOs — require a referral from a primary care physician or pre-approval for certain services before they will cover them.
• Coordination-of-benefits issues: If you have more than one insurance plan and the plans disagree on which is primary, claims can be held or denied until COB is resolved.
• Out-of-network status: If your provider is not in your plan's network, your plan may apply different (or no) benefits, resulting in a higher patient responsibility or a full denial under certain plan types.

Check the explanation codes section of your EOB — the legend at the bottom will define each code and point you toward the specific reason for the denial.

Understanding Your Appeal Rights

If you want to know how to appeal a denied physical therapy or chiropractic claim, start with your EOB. The denial notice should include information about your right to appeal and the deadline to do so.

Most employer-sponsored and individual health plans are required to offer at least one level of internal appeal. Key points to be aware of:

• Appeal deadlines vary by plan type and state law — they are commonly 30 to 180 days from the date of the denial notice, but your specific plan documents govern.
• Acting promptly matters. Missing a deadline may forfeit your right to appeal that specific claim.
• Your provider's billing office can often help you gather the clinical documentation — treatment notes, diagnosis codes, functional assessments — that supports a medical-necessity appeal.
• If the internal appeal is unsuccessful, most plans also offer an external review option through an independent organization.

This article does not constitute legal advice, and appeal outcomes cannot be predicted. A provider's billing coordinator or a patient advocate can help you understand the process for your specific plan.

What to Do Next: A Step-by-Step Action Sequence

Knowing what to do after receiving an Explanation of Benefits makes the process much less stressful. Follow these steps in order.

Step 1: Verify the EOB Against Your Visit Records

1. Locate any appointment summaries, visit receipts, or records from your provider.
2. Confirm the dates of service on the EOB match the dates you actually received care.
3. Confirm the provider name listed is correct.
4. Confirm the services listed reflect what was actually performed. If a service appears that you did not receive, contact your provider's billing office immediately.

{{screenshot: Close-up of the "Date of Service" and "Provider" columns on a sample EOB with checkmarks indicating items to verify}}

Step 2: Wait for the Actual Bill Before Paying

1. Set the EOB aside in a safe place — do not pay anything based on it alone.
2. Your provider's office will send a separate statement once your insurer has processed the claim. That statement is the bill.
3. If weeks pass without a bill and you are concerned, you may call the billing office to ask about the status — but no payment is due until you receive a formal statement.

Step 3: Compare the EOB to Any Bill You Receive

1. When the bill arrives, place it side by side with your EOB.
2. The patient responsibility amount on the EOB should match (or be very close to) the amount billed by the provider.
3. If the figures differ significantly — particularly if the provider's bill is higher than your EOB's patient responsibility — contact the billing office before paying.

Step 4: Contact Your Provider's Billing Office

Your provider's billing team is often the most practical resource for EOB questions. When you call, consider asking:

• "Can you confirm the services on my EOB match what was documented in my chart?"
• "The EOB shows a denial — do you plan to appeal, or is there something I need to do?"
• "Is the patient responsibility amount on my EOB the same as what I'll be billed?"
• "I have a secondary insurance plan — has a coordination-of-benefits claim been filed?"
• "I am represented by an attorney in a personal-injury case — how is billing being handled for my visits?"

If you haven't yet found a chiropractor or physical therapist who accepts your insurance, the MedXimity provider directory can help you locate conservative-care providers in your area. You can also read how to message your provider through the patient portal if you prefer to send billing questions in writing.

Frequently Asked Questions About EOBs

Is an EOB the same as a bill? No. An Explanation of Benefits is a summary of how your insurer processed a claim — it is not a request for payment. Wait for a separate statement from your provider's office before paying anything. What does patient responsibility mean on an EOB? Patient responsibility is the portion of the allowed amount that your insurance plan did not cover — typically the sum of your deductible, coinsurance, and any copay applied to that visit. It is the amount you may owe your provider, confirmed when you receive their bill. Why does my EOB show $0 paid by my plan? Several things can result in a $0 plan payment: your deductible may not yet be met, the service may have been denied, the provider may be out-of-network under a plan that does not cover out-of-network care, or a visit limit may have been reached. Check the explanation codes on the EOB to identify the specific reason. Can my chiropractor's or physical therapist's office help me read my EOB? Yes. Most provider billing offices are experienced with insurance documents and can walk you through what the EOB means for your account. They can also confirm whether they plan to appeal a denial on your behalf. How long does insurance have to process a claim? Timelines vary by state law and plan type. Many states require insurers to process clean claims within 30 to 45 days, but the specific deadline that applies to your plan depends on whether it is fully insured, self-funded, or a government program. If a claim appears to be taking unusually long, your provider's billing office can follow up directly with the insurer. How long do I have to appeal a denial? Appeal windows vary by plan and are often printed on the denial notice itself. They commonly range from 30 to 180 days from the denial date. Check your plan documents or call your insurer's member services line to confirm the deadline for your specific plan — and act promptly, as missed deadlines can close the appeal window.

Still Need Help?

If you have reviewed this guide and still have questions about your EOB or your provider's billing, here are your next steps:

• Contact your provider's billing office — they are your most direct resource for claim-specific questions.
• Call your insurer's member services line — the number is printed on your insurance card. Ask them to walk you through the denial codes or benefit calculation on your specific EOB.
• Explore the MedXimity Help Center for additional articles on navigating care and insurance as a patient.
• If you are looking for a conservative-care provider who accepts your insurance, visit the MedXimity provider directory to search by location and specialty.
• Already a patient using the portal? Learn how to message your provider through the patient portal to ask billing questions in writing.