
Medicaid is a government insurance program that interacts with other payers when beneficiaries have other sources that are legally liable for the payment of their medical costs. These sources include private insurance, Medicare, and other public programs. In most cases, Medicaid acts as the payer of last resort, with other legally responsible sources required to pay for medical costs before the Medicaid program. This raises the question of whether doctors can legally refuse to bill Medicaid as secondary insurance. While there is some variation in responses from different providers, it appears that in certain cases, doctors can legally refuse to bill Medicaid as secondary insurance, particularly if they are out of network for straight MassHealth but are subject to MassHealth billing rules through a managed care plan.
| Characteristics | Values |
|---|---|
| Can doctors legally not bill Medicaid as secondary insurance? | Yes, in some cases, doctors can legally choose not to bill Medicaid as secondary insurance. Medicaid interacts with other payers when beneficiaries have other sources that are liable for payment, such as private insurance or Medicare. Medicaid often acts as the payer of last resort, and providers must accept payment from Medicaid as payment in full, without additional charges. |
| Reasons for not accepting Medicaid as secondary insurance | Doctors may be out of network for certain Medicaid plans, face billing complexities, or deal with slow reimbursement and low payout rates. |
| Impact on Patients | Patients with Medicaid as secondary insurance may face challenges finding in-network providers, potentially limiting their access to specialized care. |
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What You'll Learn

Medicaid beneficiaries with other legally liable sources
Medicaid beneficiaries may have other sources that are legally liable for the payment of their medical costs. These sources include private insurance, Medicare, other public programs (such as the Ryan White program), workers' compensation, and amounts received for injuries in liability cases. In such cases, Medicaid interacts with these other payers.
When a Medicaid beneficiary has another coverage source, it is referred to as wrap-around coverage. Providers who accept Medicaid payment for beneficiaries with another coverage source may charge cost-sharing for services covered by both sources. However, providers who participate in the Medicaid fee-for-service program may not bill Medicaid for any services included in a beneficiary's managed care plan. An exception to this is family planning services, where the provider does not provide such services under a contract with the recipient's health plan.
In most cases, Medicaid acts as the payer of last resort for most services. Under the program's third-party liability (TPL) rules, other legally responsible sources are required to pay for medical costs incurred by a beneficiary before the Medicaid program. As a condition of eligibility, Medicaid enrollees must identify potential third-party sources of coverage and assign the Medicaid agency the right to pursue third-party liability on their behalf.
In some cases, Medicaid may pay for services that might otherwise be financed by other public agencies or programs. This can occur when these agencies or programs are statutorily designated as payers of last resort after Medicaid or are not considered legally liable third parties. For example, the majority of Medicaid enrollees receive at least some of their benefits through managed care plans, which contract directly with states and must comply with Medicaid-specific requirements.
Therefore, it is essential for Medicaid beneficiaries with other legally liable sources to understand how their coverage interacts with Medicaid and to ensure that they provide the necessary information to their providers to avoid unexpected charges.
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Medicaid as the payer of last resort
Medicaid is generally the payer of last resort. This means that if a Medicaid enrollee has another source of health care coverage, that source should pay its share before Medicaid pays. Federal regulations refer to amounts owed by non-Medicaid payers as third-party liability (TPL). Under the program's TPL rules, other legally responsible sources are generally required to pay for medical costs incurred by a beneficiary before the Medicaid program will do so. As a condition of eligibility, Medicaid enrollees must identify potential third-party sources of coverage and assign the Medicaid agency the right to pursue third-party liability on their behalf.
There are some exceptions to the requirement for cost avoidance. For example, states must pay first for claims for prenatal care and preventive pediatric services and then seek reimbursement from a liable third party, including an absent parent. Additionally, there are cases where Medicaid may pay for services that might otherwise be financed by other public agencies or programs. This could be because they are statutorily designated as payers of last resort after Medicaid, such as the Ryan White HIV/AIDS grant program, or because they are not considered to be legally liable third parties, such as schools and public health or child welfare agencies carrying out their general responsibilities to ensure access to needed health care.
In practice, there are several challenges that State Medicaid agencies face in their efforts to meet TPL requirements. These include difficulties obtaining complete, accurate, and up-to-date coverage information from Medicaid enrollees and providers, as well as difficulties coordinating TPL with out-of-state third parties and certain federal programs, such as TRICARE (the U.S. military's healthcare program).
To address these challenges, the Centers for Medicare & Medicaid Services (CMS) have recommended providing updated guidance to states on effective practices for addressing these issues, as well as developing an action plan to help states more easily identify liable third parties and recover Medicaid payments.
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Medicaid's interaction with other payers
Medicaid interacts with other payers when beneficiaries have other sources that are legally liable for the payment of their medical costs. These may include private insurance, Medicare, other public programs such as the Ryan White HIV/AIDS program, workers' compensation, and amounts received for injuries in liability cases.
In most cases, Medicaid acts as the payer of last resort for most services. Under the program's third-party liability (TPL) rules, other legally responsible sources are required to pay for medical costs before the Medicaid program. As a condition of eligibility, enrollees must identify potential third-party sources of coverage and assign the Medicaid agency the right to pursue third-party liability on their behalf.
There are exceptions to this rule, including certain prenatal and pediatric services, for which Medicaid may pay and then seek reimbursement. There are also cases where Medicaid may pay for services that might otherwise be financed by other public agencies or programs. This could be because they are designated as payers of last resort after Medicaid or are not considered legally liable third parties, such as schools and public health or child welfare agencies.
When Medicaid benefits supplement another coverage source, such as Medicare or private insurance, it is often referred to as wrap-around coverage. Providers who accept Medicaid payment for beneficiaries with another coverage source may charge cost-sharing for services covered by both sources, but only up to allowable Medicaid amounts. However, providers are prohibited from charging cost-sharing to beneficiaries for certain services provided to individuals who are dually eligible for Medicare and Medicaid.
In terms of coordination of benefits, if an individual has Medicare and other health insurance, each type of coverage is called a "payer". The "primary payer" pays up to its coverage limit and then sends the remaining balance to the "secondary payer". If the secondary payer doesn't cover the remaining balance, the individual may be responsible for the remaining costs.
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Billing protections for patients with Medicaid
Medicaid beneficiaries are protected by the No Surprises Act, which safeguards them from receiving surprise medical bills. This act supplements state surprise billing laws, creating a baseline for consumer protections against surprise bills and higher cost-sharing. It also establishes an independent dispute resolution process for payment disputes between plans and providers.
The No Surprises Act protects individuals with Medicaid coverage from surprise billing for emergency services, regardless of where they are provided. It also bans high out-of-network cost-sharing for emergency and non-emergency services, ensuring that patient cost-sharing, such as co-insurance or deductibles, does not exceed in-network provider rates. Additionally, it prohibits out-of-network charges for ancillary care, such as anesthesiology or radiology, at in-network facilities.
In terms of provider requirements, doctors or providers must inform patients if they refuse to accept them as a Medicaid patient before providing any services. This ensures that beneficiaries are aware of their financial responsibility. Providers who accept a patient as a Medicaid beneficiary are prohibited from billing the patient directly for services covered by Medicaid. Instead, they must bill Medicaid for the services provided.
Medicaid also interacts with other payers when beneficiaries have additional sources that are legally liable for payment, such as private insurance, Medicare, or other public programs. In most cases, Medicaid acts as the payer of last resort, with other legally responsible sources required to pay before the Medicaid program.
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Medicaid's coverage of services by other insurance providers
Medicaid beneficiaries may have other sources that are legally liable for the payment of their medical costs. These may include private insurance, Medicare, other public programs such as the Ryan White program, workers' compensation, and amounts received for injuries in liability cases.
Medicaid may also pay for services that might otherwise be financed by other public agencies or programs. This could be because they are designated as payers of last resort after Medicaid, or because they are not considered legally liable third parties. Examples of such agencies include schools and public health or child welfare agencies.
In most cases, Medicaid acts as the payer of last resort for most services. Under the program's third-party liability (TPL) rules, other legally responsible sources are required to pay for medical costs before the Medicaid program. As a condition of eligibility, Medicaid enrollees must identify potential third-party sources of coverage and assign the Medicaid agency the right to pursue third-party liability on their behalf.
Medicaid beneficiaries can have one or more additional sources of coverage for healthcare services. Third-party liability refers to the legal obligation of third parties, such as insurers or programs, to pay for medical assistance under a Medicaid state plan. By law, all other available third-party resources must meet their legal obligation to pay claims before the Medicaid program pays for the care of an individual eligible for Medicaid.
In the case of individuals with both Medicare and full Medicaid coverage, referred to as "dually eligible," Medicare pays first for Medicare-covered services. Medicaid pays last, after Medicare and any other health insurance. Medicaid may also pay Medicare Part B monthly premiums for eligible individuals. Additionally, Medicaid may cover some drugs that Medicare does not.
In certain instances, state Medicaid programs may arrange for another entity to pay providers for Medicaid-covered services. This can occur through managed care contracts or premium assistance programs. When Medicaid benefits supplement another coverage source, it is often referred to as wrap-around coverage.
Providers who accept Medicaid payment for beneficiaries with another coverage source may charge cost-sharing for services covered by both sources. However, providers who participate in Medicaid fee-for-service cannot bill Medicaid for services included in a beneficiary's managed care plan, except for family planning services when the provider doesn't offer them under a contract with the recipient's health plan.
Furthermore, when a provider accepts a Medicaid beneficiary as a patient, they agree to bill Medicaid for the services provided or, in the case of a Medicaid managed care enrollee, the beneficiary's managed care plan for services covered by the contract. If a provider advises a beneficiary that their Medicaid card or health plan card is valid for a particular date of service, they cannot change their mind and bill the beneficiary for that service afterward.
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Frequently asked questions
Yes, in some cases, doctors can legally choose not to bill Medicaid as secondary insurance. Medicaid often acts as the payer of last resort, and other legally responsible sources are required to pay for medical costs before the Medicaid program. Doctors are prohibited from billing patients they know have Medicaid in some states, and some doctors may refuse to see patients with Medicaid.
When Medicaid is secondary insurance, the primary insurance is billed first. If there are any remaining costs, they are sent to Medicaid to be covered.
Doctors may refuse to accept Medicaid as secondary insurance due to the low reimbursement rate and delayed payments. Medicaid has specific billing rules and protections that providers may be unwilling or unable to deal with.
If a doctor refuses to accept your Medicaid as secondary insurance, you can try calling the number on your Medicaid card and asking for help finding a provider that accepts it. You may also need to find a doctor who accepts both your primary and secondary insurance.











































