Charts & Treasure Maps

Your Billing
Toolkit

Checklists, sample letters, and a plain-English glossary of every billing term you'll encounter. Print them, use them, keep them in hand.

Printable Checklists

Check Every Box
Before You Pay

Use these checklists whenever you receive a medical bill or insurance form. Check the items as you go — or print them for offline use.

Reviewing Your EOB
9 items
My name and insurance ID number are correct
The date of service matches my appointment date
The provider name matches the facility or doctor I visited
I have reviewed the "Amount Billed" vs. "Amount Allowed" vs. "Your Responsibility"
No services are listed that I don't recognize
The CPT codes on the EOB match the codes on my provider's bill
The claim was correctly processed as in-network (if the provider is in your network) — if it was processed as out-of-network unexpectedly, contact the provider's billing department to investigate
Any denial codes are noted and I have looked up what they mean
I have filed this EOB with my bill for reference
Before Paying Any Bill
7 items
I have received and reviewed my EOB from insurance
The amount on the bill matches the "Your Responsibility" on my EOB
I have requested an itemized bill if I only received a summary
My name and date of birth on the bill are correct
I have not been billed for any services I didn't receive
There are no duplicate charges on the itemized bill
If I have a concern, I have called the billing department before paying
Responding to a Denial
8 items
I have noted the specific reason for the denial provided in the letter. If a denial reason code was provided, I have looked it up
I have checked my plan's summary of benefits to confirm coverage
I have checked my plan's policy book for medical necessity criteria to ensure I meet the criteria for the service. I have requested a copy of the policy if it was not publicly available
I have noted the appeal deadline as well as any other instructions for the plan's appeal process from the denial letter
I have contacted my doctor's office about the denial
I have written a formal appeal letter
I have sent the appeal via certified mail or submitted through the member portal
I have kept copies of everything submitted
Responding to a Hold Letter
6 items
I have read the hold letter and identified exactly what is being requested
I have called my doctor's office to notify them of the hold
My doctor's office has submitted the requested documentation
I have confirmed with insurance that the documentation was received
I have a reference number from insurance for my follow-up call
I have set a follow-up reminder for 2 weeks from today

Sample Letters

Ready-to-Use
Templates

Fill in the bracketed fields with your information. Send via certified mail or through your insurer's member portal. Keep a copy of everything.

✉️
Denial Appeal Letter
Use when: Your insurance denied a claim you believe should be covered
View Template ↓
[Your Name] [Your Address] [City, State, ZIP] [Date] [Insurance Company Name] Appeals Department [Insurance Company Address] Re: Appeal of Claim Denial Member ID: [Your Member ID] Claim Number: [Claim Number from Denial Letter] Date of Service: [Date] Provider: [Doctor or Facility Name] Dear Appeals Department, I am writing to formally appeal the denial of the above-referenced claim, which I received on [Date of Denial Letter]. The stated reason for denial was: [Reason Code and Description from Denial Letter]. I believe this denial is incorrect for the following reason(s): [Explain why the service should be covered — e.g., it was medically necessary, it was an in-network provider, it was a covered benefit under my plan, etc.] I am enclosing the following supporting documentation: - Copy of the denial letter - Copy of my Explanation of Benefits (EOB) - [Any additional documentation from your doctor] I request that you review this claim and reverse the denial. Please respond in writing within the timeframe required by my plan. Sincerely, [Your Name] [Your Phone Number] [Your Email Address]

⚠️ Send via certified mail with return receipt, or through your insurer's online member portal. Keep the tracking number and a copy of everything you submit. Note the appeal deadline from your denial letter.

📋
Itemized Bill Request
Use when: You received a summary bill and need line-item detail
View Template ↓
[Your Name] [Your Address] [Date] [Provider Name] — Billing Department [Provider Address] Re: Request for Itemized Bill Account Number: [Your Account Number] Date of Service: [Date] Dear Billing Department, I am writing to request a complete itemized bill for the above-referenced account. The bill I received on [Date] was a summary statement and did not include individual line items, CPT codes, or associated charges. Under my rights as a patient, I am entitled to an itemized bill showing each service rendered, the corresponding CPT and ICD-10 codes, the amount charged for each service, and any adjustments or payments applied. Please send the itemized bill to the address above or to [your email] at your earliest convenience. I will not remit payment until I have had the opportunity to review the itemized charges. Thank you for your assistance. Sincerely, [Your Name] [Your Phone Number]

💡 Providers are legally required to provide itemized bills upon request. Do not pay a summary bill until you've reviewed the itemized version against your EOB.

🔍
Billing Error Dispute
Use when: You found an error in your provider's bill
View Template ↓
[Your Name] [Your Address] [Date] [Provider Name] — Billing Department [Provider Address] Re: Billing Error Dispute Account Number: [Your Account Number] Date of Service: [Date] Dear Billing Department, I am writing to dispute an error on my bill dated [Bill Date]. After comparing the bill to my Explanation of Benefits (EOB) from [Insurance Company Name], I have identified the following discrepancy: Error Description: [Describe the error — e.g., "CPT code 99214 was billed, but my EOB shows CPT code 99213. The charge of $X does not match the allowed amount on my EOB."] I am enclosing: - A copy of my EOB dated [Date] - A copy of the bill in question I request that you review and correct this error and send me an updated, corrected bill. I will remit payment once the bill accurately reflects the amount shown on my EOB. Thank you for your prompt attention to this matter. Sincerely, [Your Name] [Your Phone Number]

💡 Always include copies of your EOB and the disputed bill. Reference the specific CPT codes and amounts in your dispute for a faster resolution.

Billing Glossary

Decode the
Billing Language

Every term you'll encounter in medical billing — explained in plain English.

🔍
A
Adjustment
A reduction to the original billed amount. Insurance companies negotiate discounts with in-network providers — the "adjustment" is the difference between what was billed and what the insurer's contract allows.
Allowed Amount
The maximum amount an insurance company will pay for a covered service. Also called the "negotiated rate" or "contracted rate." In-network providers agree to accept this amount as full payment.
Appeal
A formal request to your insurance company to reconsider a denial or underpayment decision. You typically have 180 days from the date of denial to file an internal appeal.
Abuse (Medical Billing)
Abuse in medical billing refers to practices that are inconsistent with sound medical, business, or fiscal practices — and that result in unnecessary costs or improper payments. Unlike fraud, abuse does not necessarily involve intentional deception. Examples include billing for services that were not medically necessary, charging excessively for services or supplies, or routinely waiving patient copays or deductibles without cause. The line between abuse and fraud can be blurry, and repeated patterns of abuse may be investigated as fraud. If you believe a provider is engaging in abusive billing practices, you can report it to your insurance company or your state's insurance commissioner.
B
Balance Billing
When a provider bills you for the difference between their charge and the insurance allowed amount. In-network providers generally cannot balance bill you. Out-of-network providers may be able to, depending on your plan and state laws.
Bundling
When insurance pays a single rate for multiple services performed together, rather than paying for each separately. Unbundling (charging separately for procedures normally bundled) is a common billing error.
C
Claim
A formal request submitted by a provider to your insurance company for payment for services rendered.
Coinsurance
Your share of the cost of a covered service after you've paid your deductible. Expressed as a percentage — for example, if you have 20% coinsurance, you pay 20% and insurance pays 80%.
Copay (Copayment)
A fixed dollar amount you pay for a covered service, usually at the time of service. For example, a $25 copay for an office visit.
CPT Code
Current Procedural Terminology code. A 5-digit standardized code that describes a specific medical service or procedure. CPT codes are used by providers to bill insurance and determine payment amounts.
D
Deductible
The amount you pay for covered services before your insurance begins to pay. For example, if your deductible is $1,500, you pay the first $1,500 of covered services each year.
Denial
A decision by your insurance company not to pay for all or part of a claim. Denials must come with a reason code and you have the right to appeal.
Duplicate Billing
When the same service is billed to insurance more than once. A common billing error that can result in you being charged twice for a single service.
E
EOB (Explanation of Benefits)
A document sent by your insurance company after a claim is processed. It shows what was billed, what insurance paid, and what you may owe. An EOB is not a bill — it is a statement of how a claim was processed.
External Review
An independent review of an insurance decision by a third party not affiliated with your insurance company. You may request an external review after your internal appeal is denied.
F
Fraud (Medical Billing)
Medical billing fraud is the intentional submission of false or misleading information to obtain payment that would not otherwise be covered. Examples include billing for services that were never provided, misrepresenting a diagnosis to justify a procedure, using a different provider's name or credentials on a claim, or falsifying records. Fraud is illegal and can result in criminal charges, fines, and exclusion from insurance programs. It is different from billing errors, which are unintentional mistakes, though the financial impact on patients can be similar. If you suspect you have been a victim of medical billing fraud — for example, you receive a bill or an EOB for a service you never received — contact your insurance company's fraud hotline and consider reporting it to your state's attorney general or the U.S. Department of Health and Human Services Office of Inspector General.
I
ICD-10 Code
International Classification of Diseases, 10th Revision code. Describes a patient's diagnosis or medical condition. Must logically align with the CPT procedure codes submitted — a mismatch can cause claim denial.
In-Network
A provider who has a contract with your insurance company. In-network providers have agreed on set rates, typically resulting in lower costs for you.
Itemized Bill
A detailed bill that lists every individual service, the corresponding CPT code, the date of service, and the charge for each item. You are entitled to request one from any provider.
M
Medical Necessity
Insurance's determination that a service is appropriate, reasonable, and necessary for the diagnosis and treatment of the patient's condition. Services deemed not medically necessary are commonly denied.
Member ID
Your unique identification number on your insurance card. Always verify this number matches what appears on your EOB and any claims submitted by providers.
O
Out-of-Network
A provider who does not have a contract with your insurance company. Services from out-of-network providers are typically covered at a lower rate or not at all, depending on your plan.
Out-of-Pocket Maximum
The most you will have to pay in a plan year for covered services. After reaching this amount, insurance pays 100% of covered services for the rest of the plan year.
P
Prior Authorization (Prior Auth)
Approval from your insurance company required before receiving certain services or medications. If prior auth is required and not obtained, the claim may be denied.
Peer-to-Peer Review (P2P)
A peer-to-peer review is a phone call between your doctor and a medical reviewer at the insurance company, typically requested after a denial based on medical necessity. Your doctor speaks directly with the insurer's physician reviewer to explain why the service was clinically appropriate. A peer-to-peer call is not a formal appeal — it is an informal step that happens before or instead of the appeals process. It can be very effective, and many denials are reversed after a successful P2P call. If your claim is denied for medical necessity, ask your doctor's office whether they can request a peer-to-peer review with the insurance company.
Premium
The monthly amount you pay for your insurance coverage, regardless of whether you use medical services.
R
Reconsideration
A reconsideration is an informal request to have an insurance company take another look at a denied claim — it is different from a formal appeal. While an appeal is a structured process with legal timelines and rights, a reconsideration is typically a less formal first step where you or your provider call or write to the insurer and ask them to review the decision again, often with additional information or clarification. Not all insurers use the term "reconsideration" — some call it an informal review or a pre-appeal review. A reconsideration does not typically reset the clock on your formal appeal deadline, so if it is unsuccessful, you should still file a formal appeal within the required timeframe.
Remittance Advice
A document sent to providers showing how a claim was processed and paid. Similar to an EOB but sent to the provider instead of the patient.
U
Upcoding
Billing for a more expensive service or procedure than was actually performed. One of the most common forms of medical billing fraud and error. Detectable by comparing CPT codes on the bill to the clinical record.
W
Waste (Medical Billing)
Waste in medical billing refers to the overuse of services or other practices that result in unnecessary costs to the healthcare system — without any deliberate intent to deceive. Unlike fraud, waste is not intentional, and unlike abuse, it may not even involve inappropriate practices by the provider. Examples include ordering more tests than are clinically necessary, prescribing brand-name medications when generics are available, or inefficient use of resources that drives up costs. Waste is a major contributor to inflated healthcare costs and can result in higher premiums and out-of-pocket expenses for patients. While waste is harder to identify on an individual bill than fraud or abuse, being aware of it can help you have informed conversations with your provider about whether all ordered services are truly necessary.

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