Surprise Medical Bills, Balance Billing & Negotiated Rates in California

Received a Surprise Medical Bill?  

Do not assume that the entire amount is correct simply because a bill arrived. First compare the provider’s bill with your insurance company’s Explanation of Benefits (EOB). The EOB is not a bill. It shows how the claim was processed, the amount allowed by the plan, what the plan paid and the amount the plan believes you may owe.

• Check the patient responsibility amount. The amount on the provider’s bill should normally agree with the patient responsibility shown on the EOB.
• Ask for an itemized bill. Request the dates, services, quantities and billing codes included in the total.
• Call the insurance company. Ask whether the provider and facility were in-network, whether the claim was processed correctly and whether any part of the bill may be prohibited balance billing.
• Call the provider’s billing department. Explain that the amount is disputed and ask them to place the disputed balance on hold while the insurance company reviews it.
• Keep copies. Save the bill, EOB, insurance card, letters, emails, reference numbers and the names and dates of everyone you speak with.

If the insurance company or provider does not correct the problem, you may need to file a written appeal or grievance. Do not wait until the bill has been sent to collections before asking for help.

What Are Negotiated Rates and Balance Billing?

An in-network provider has an agreement with your insurance company or health plan. That agreement normally establishes a negotiated or contracted rate for covered services. The provider generally agrees to accept the contracted amount, together with your valid deductible, copayment or coinsurance, as payment in full.

Balance billing occurs when a provider attempts to collect the difference between the provider’s full charge and the amount recognized or paid by the insurance plan. Balance billing may be prohibited when the provider is in-network or when California or federal surprise-billing protections apply.

Example: A provider charges $1,000. The insurance company’s negotiated rate is $400. The plan pays $300 and the EOB says that you owe $100. For a covered in-network service, you would generally owe the $100 shown on the EOB—not the remaining $600 that was removed by the provider discount.

Different rules may apply when a service is excluded, was not properly authorized, was received outside the network or is not protected by surprise-billing law. Your own Evidence of Coverage explains your plan’s rules for covered services, networks, prior authorization and member cost sharing.

Your deductible, copayments and coinsurance for covered in-network care generally count toward your plan’s out-of-pocket maximum. Amounts you pay for excluded services or ordinary out-of-network balance bills may not count.

California Surprise Medical Bill Protections

California’s surprise medical bill protections generally limit what a consumer must pay when the consumer receives nonemergency services at an in-network facility but unknowingly receives care from an out-of-network physician or other professional.

When California’s protection applies, the consumer is generally responsible only for the deductible, copayment or coinsurance that would have applied if the professional had been in-network. The out-of-network professional and the insurance company must resolve their payment disagreement without transferring the disputed balance to the patient.

• The facility must be in your plan’s network.
• The service must be covered by your plan.
• The out-of-network professional generally must have been someone you did not knowingly choose.
• Your required cost sharing should generally be treated as in-network cost sharing.

California has also adopted separate ground ambulance balance-billing protections for many state-regulated health plan members. The precise protection and complaint agency depend on the type of health plan you have.

California law does not mean that every out-of-network service must be covered. Different rules can apply to self-funded employer plans, Medicare, Medi-Cal, services received at an out-of-network facility and services that are not covered under your policy. Review your EOB and file an appeal or grievance if the plan processed protected care as ordinary out-of-network care.

Federal No Surprises Act Protections

The federal No Surprises Act took effect January 1, 2022. It protects people enrolled in most individual and employer health plans from many unexpected out-of-network medical bills.

The federal protections generally apply to:

• Most emergency services, even when the emergency facility or treating provider is outside your plan’s network.
• Certain nonemergency services provided by an out-of-network professional during a visit to an in-network hospital, hospital outpatient department, critical access hospital or ambulatory surgical center.
• Covered air ambulance services provided by an out-of-network air ambulance company.

When the law applies, your cost sharing generally cannot be higher than the in-network amount. The provider and insurance plan must resolve their disagreement over the remaining payment without balance billing you.

Federal protections generally do not apply to ordinary nonemergency treatment received at an out-of-network facility or to ground ambulance services. California law may provide additional ground ambulance protection for some California plans.

In limited nonemergency situations, an out-of-network provider may give you a notice asking you to consent to out-of-network treatment and waive federal protections. Do not sign a waiver unless you understand which provider is out-of-network, why that provider is being used and approximately how much you may owe.

People who are uninsured or who choose not to use insurance can generally request a written Good Faith Estimate. A federal patient-provider dispute process may be available when a bill from a provider or facility is at least $400 above that provider’s estimate.

Negotiated Rates, Itemized Bills and Your EOB

A negotiated rate, sometimes called a contracted or allowed rate, is the amount an insurance company and an in-network provider have agreed to recognize for a covered service. It is frequently much lower than the provider’s original billed charge.

Your Explanation of Benefits may show:

• The amount originally billed by the provider.
• The network discount or adjustment.
• The allowed or negotiated amount.
• The amount paid by the insurance plan.
• The deductible, copayment or coinsurance assigned to you.
• Any service that was denied or excluded.

An EOB is not a bill. Compare it with the provider’s itemized medical bill. Check for duplicate charges, services you did not receive, incorrect dates, incorrect quantities and a patient-responsibility amount that does not match the EOB.

If the claim was denied, read the explanation or denial code on the EOB. A denial does not always mean that the service is permanently excluded. The provider may have used an incorrect billing code, omitted information or failed to obtain required authorization. Ask whether the provider can correct and resubmit the claim before you pay the full amount.

Your own Evidence of Coverage controls the detailed rules for covered services, exclusions, prior authorization, networks and cost sharing. It is more useful for your personal dispute than a general description of how another insurance policy works.

Where to File a Complaint

Start by filing a written appeal or grievance with your insurance company. Explain what happened, identify the claim and dates of service, state why you believe the amount is incorrect and include copies of your bill and EOB.

If the problem is not resolved, the correct government agency depends on who regulates your plan:

• California Department of Managed Health Care: Many California HMO and managed-care plans are regulated by the DMHC Help Center. DMHC generally asks consumers to file a grievance with their health plan before filing a state complaint.
• California Department of Insurance: Many PPO insurance policies are regulated by the California Department of Insurance.
• Federal No Surprises Act: You may submit a complaint to the No Surprises Help Desk or call 1-800-985-3059.

Include as many supporting documents as possible, including the medical bill, EOB, insurance card, your written appeal, the plan’s response, relevant pages from your Evidence of Coverage and any notice or consent form you were asked to sign.

If the account has already been sent to a collection agency, review our information about medical debt, debt collection and forgiven medical bills. Continue disputing an incorrect bill in writing and keep copies of everything you send.

Not sure who regulates your plan? Email Steve Shorr with the name of the insurance company, the type of plan and a brief description of the issue. Do not email your Social Security number or detailed confidential medical records.

Medical Price Estimates and Transparency Tools

Before scheduling nonemergency care, use your insurance company’s online price-comparison or cost-estimator tool. Most health plans must make personalized cost-sharing estimates available for covered services.

Ask the doctor or facility for the billing code, commonly called a CPT or HCPCS code, that they expect to use. Then ask your insurance company:

• Is the doctor in-network for my exact plan?
• Is the hospital, laboratory, imaging center or surgery center in-network?
• Will there be a separate facility fee?
• Could I receive separate bills from an anesthesiologist, radiologist, pathologist, assistant surgeon or laboratory?
• Is prior authorization required?
• What amount should apply to my deductible and other cost sharing?

Always confirm the provider network directly with both the provider and the insurance company. A doctor may participate in one plan offered by an insurance company but not another plan offered by the same company.

Federal Hospital Price Transparency rules require hospitals to post standard-charge information and provide consumer-friendly pricing information for shoppable services. Health plans must also publish large machine-readable pricing files. These technical files are primarily useful to researchers and software developers; your insurer’s personalized estimator is usually more practical.

Prices shown online are estimates rather than guarantees. The final amount can change when a different service or billing code is used, complications occur, additional professionals become involved or your deductible changes before the claim is processed.

If you are uninsured or will not submit the claim to insurance, request a written Good Faith Estimate from each provider and facility expected to participate in your care.

2026 Update: Provider–Insurer Arbitration

The Federal Independent Dispute Resolution process, often called IDR or arbitration, is used when an out-of-network provider and a health plan cannot agree on the amount the provider should be paid for a claim protected by the No Surprises Act.

This is generally a dispute between the provider or facility and the insurance plan. It is not supposed to become a bill for the protected balance sent to the patient. The consumer may still owe the legitimate in-network deductible, copayment or coinsurance shown by the plan.

In May 2026, federal agencies issued a final rule updating the IDR process. The changes are intended to improve communications, clarify deadlines, address the grouping or batching of related claims and reduce the number of disputes that are found to be ineligible after entering the system.

For disputes initiated on or after June 11, 2026, the federal administrative fee was reduced from $115 to $15 for each party. CMS reported that the IDR system had received more than five million disputes since it began operating in April 2022.

The large number of disputes may affect administrative costs and negotiations between providers and insurers, but it does not eliminate the patient protections established by the No Surprises Act. Consumers should continue to review the EOB and challenge any attempt to collect more than the protected cost-sharing amount.

For additional industry discussion, see the Modern Healthcare report on No Surprises Act billing disputes.