What Is a Health Insurance Claim?

By the Florida Plan Finder Team · Licensed Florida Health Insurance Producer · NPN #21249133 · Last Updated: April 8, 2026

Every time you receive a medical service covered by your health insurance plan, a claim is generated. A health insurance claim is the mechanism by which your provider gets paid and your cost-sharing (deductible, copay, coinsurance) is calculated. Most of the time, this process happens behind the scenes. But when something goes wrong — a claim is denied, a bill seems too high, or you receive a surprise charge — understanding the claims process gives you the knowledge to respond effectively.

How the Claims Process Works

The health insurance claims process follows a standard sequence, whether you are seeing a primary care doctor, visiting the emergency room, or having surgery:

• Step 1: You receive a covered medical service. You visit a doctor, get lab work, fill a prescription, or receive hospital care.
• Step 2: The provider submits a claim. The provider (or their billing department) creates a claim using standardized medical billing codes (CPT codes for services, ICD-10 codes for diagnoses) and submits it electronically to your insurance company.
• Step 3: The insurer processes the claim. The insurer verifies your coverage, confirms the service is covered under your plan, applies the in-network negotiated rate (the "allowed amount"), and calculates your cost-sharing based on your deductible status, copay, or coinsurance.
• Step 4: The insurer pays the provider. The insurer sends payment for its share directly to the in-network provider.
• Step 5: You receive an EOB. The insurer sends you an Explanation of Benefits — a statement (not a bill) that itemizes the service, what was billed, what the allowed amount was, what the insurer paid, and what you owe.
• Step 6: You receive a bill from the provider. The provider bills you for your remaining cost-sharing amount — the portion the insurer did not pay (your deductible, copay, or coinsurance).

Understanding Your Explanation of Benefits (EOB)

The EOB is a critical document that many people throw away or ignore. It is not a bill — it is an accounting of how your claim was processed. Every EOB includes:

• Provider and service description — who provided the care and what was done
• Billed amount — what the provider originally charged
• Allowed amount — the negotiated rate between your insurer and the in-network provider (this is always lower than the billed amount)
• Insurance paid — what your insurer actually paid the provider
• Your responsibility — what you owe (broken down by deductible, copay, and/or coinsurance)

Always compare your EOB to any bill you receive from the provider. If the bill amount doesn't match the "your responsibility" amount on the EOB, contact both the provider and your insurer to resolve the discrepancy before paying.

Who Files the Claim?

In-network providers file claims directly with your insurer. This is one of the key benefits of staying in-network — the administrative burden is on the provider, not you. You typically just show your insurance card at the visit and the rest is handled behind the scenes.

Out-of-network providers may or may not file claims with your insurer. In many cases, you pay the provider the full amount at the time of service and then submit a claim to your insurer yourself for reimbursement (if your plan covers out-of-network care). You will need to provide an itemized bill, the provider's tax ID, and any relevant medical records.

Common Reasons Claims Are Denied

Claim denials are not uncommon. According to KFF research, approximately 17% of in-network claims on ACA marketplace plans are denied. Common reasons include:

• Coding errors — incorrect CPT or ICD-10 codes submitted by the provider's billing department
• Lack of prior authorization — the service required advance approval that wasn't obtained
• Service not covered — the specific service is excluded from your plan's covered benefits
• Out-of-network provider — the provider is not in your plan's network (relevant for HMO/EPO plans)
• Not medically necessary — the insurer determines the service was not required based on clinical guidelines
• Duplicate claim — the same service was billed more than once
• Timely filing limit exceeded — the provider submitted the claim after the insurer's deadline (typically 90–365 days from the date of service)

How to Appeal a Denied Claim

Under the ACA, you have the right to appeal any claim denial. The appeals process has two levels:

Internal appeal: You submit a written appeal to your insurer within 180 days of the denial. Include a letter explaining why the service should be covered, any supporting medical records, and a letter from your doctor if applicable. The insurer must review the appeal using a different reviewer than the one who made the original denial decision. For urgent claims, insurers must complete the internal appeal within 72 hours.

External review: If the internal appeal is denied, you can request an independent external review. An independent third-party organization — not your insurer — reviews the case and makes a binding decision. This is a powerful consumer protection under the ACA.

The No Surprises Act and Balance Billing Protections

The federal No Surprises Act, in effect since January 2022, protects Florida patients from surprise medical bills in specific situations:

• Emergency services: You cannot be balance-billed for emergency care, regardless of whether the provider or facility is in-network. You pay your in-network cost-sharing rate.
• Out-of-network providers at in-network facilities: If you receive care at an in-network hospital but are treated by an out-of-network provider (anesthesiologist, radiologist, pathologist), you are protected from balance billing. You pay your in-network rate.
• Air ambulance services: Out-of-network air ambulance providers cannot balance bill you beyond your in-network cost-sharing amount.

These protections apply automatically — you do not need to do anything to activate them. If you receive a balance bill that you believe is covered by the No Surprises Act, contact your insurer and reference the federal protection.