
Medicare and Medicaid are federal health insurance programs that provide coverage for eligible individuals. Medicare is primarily for seniors and disabled persons, while Medicaid is designed for low-income individuals, families, and children. Dual-eligible individuals are enrolled in both programs and can receive a range of services and financial support. Medicare acts as the primary payer, covering expenses up to its limits, after which Medicaid steps in as the secondary payer. Understanding billing procedures for dual enrollees is crucial for ensuring proper reimbursement and providing adequate care for this diverse population.
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What You'll Learn

Understanding dual eligibility
Dual-eligible beneficiaries, or dual-eligible individuals, are those who receive both Medicare and Medicaid benefits. Medicare is a federal health insurance program for seniors and disabled persons, while Medicaid is a state and federal medical assistance program for financially needy persons of any age. To be considered dually eligible, a person must be enrolled in Medicare Part A (hospital insurance) and/or Medicare Part B (medical insurance).
Medicare is the primary source of health insurance coverage for dual-eligible individuals, and it covers a range of services, including physician visits, hospitalisation, and skilled nursing facility care. However, Medicare will only cover up to 100 days of skilled nursing facility care and only when medically necessary. On the other hand, Medicaid, which is jointly funded by the federal and state governments, provides supplemental coverage for services not covered by Medicare, such as long-term nursing home care, non-emergency transportation, and a broader set of behavioural health services.
The dual-eligible population can be further categorised into two groups: partial duals and full duals. Partial duals refer to individuals whose Medicaid coverage pays for some of the expenses they incur under Medicare, including premiums for Part A and Part B, deductibles, coinsurance, and copayments. To qualify as a partial dual, an individual must be disabled and working, with an income above the state's full Medicaid threshold but below a certain percentage of the federal poverty level. Full duals, on the other hand, receive the full range of Medicaid benefits not covered by Medicare, and they typically have lower income and asset levels.
It's important to note that eligibility requirements for Medicaid vary across states, as each state sets its own requirements within federally set parameters. In contrast, eligibility for Medicare is consistent across the states, and there are no income or asset limits. To be eligible for Medicare, one must be a US citizen or legal resident for a minimum of 5 years preceding the application, and meet at least one of the following criteria: be a minimum of 65 years old, be disabled, have end-stage renal disease, or have Lou Gehrig's disease (amyotrophic lateral sclerosis).
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Medicare and Medicaid benefits
Medicare and Medicaid are both health insurance programs, but there are some key differences between the two. Medicare is a federal program with consistent eligibility requirements across the US, whereas Medicaid is a joint federal and state program with varying eligibility requirements in each state. Medicare is for seniors and disabled persons and has no financial restrictions, while Medicaid is for low-income individuals, families, children, pregnant women, the elderly, and people with disabilities.
Medicare has four parts: Part A covers hospital insurance and associated costs; Part B covers medical insurance, including physician services, lab and x-ray services, and outpatient services; Part C is the Medicare Advantage Plan offered by private companies; and Part D covers prescription drugs. To be considered a dual-eligible beneficiary, an individual must be enrolled in Medicare Part A and/or Part B, and full coverage Medicaid or one of Medicaid's Medicare Savings Programs.
Medicaid covers some services that Medicare does not, such as long-term nursing home care, non-emergency transportation, and a broader set of behavioural health services. Medicaid may also cover some drugs that Medicare does not. For dual-eligible beneficiaries, Medicare pays first for the Medicare-covered services that are also covered by Medicaid. Medicaid then covers the remaining costs, as well as any additional services that Medicare does not.
The dual-eligible population falls into two groups: partial duals and full duals. Partial duals are eligible for some Medicaid benefits, such as cost-sharing for Medicare premiums, deductibles, and coinsurance. Full duals receive the full range of Medicaid benefits not covered by Medicare, such as long-term services and supports. Full duals typically have lower income and asset levels and receive the full Medicaid benefits offered by their state.
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Medicare Advantage plans
To enrol in a Medicare Advantage plan, you must be eligible and enrolled in Original Medicare Part A and Part B, and live within the plan's service area. These plans can vary in cost, with some having low or no monthly premiums, while others may have higher out-of-pocket expenses, such as deductibles, copays, and coinsurance. For example, if you select an HMO Medicare Advantage plan, you may have a smaller selection of providers to choose from, and seeing an out-of-network provider can be more expensive.
If you have both Medicare and full Medicaid coverage, you are considered "dually eligible". Medicare pays first for Medicare-covered services, and Medicaid covers any remaining expenses for services that Medicare doesn't cover.
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Medicaid income qualifications
Medicaid is a joint federal and state program that provides health coverage to Americans with low incomes, including children, pregnant women, parents, seniors, and individuals with disabilities. The program is the single largest source of health coverage in the United States.
While Medicaid is a federal program, it is administered by each state, and eligibility requirements vary by state. Generally, eligibility depends on income and resources, as well as other criteria such as age, pregnancy or parenting status, and residency. Each state has its own income limits for Medicaid eligibility, which may differ depending on the type of Medicaid for which an individual is applying. For example, Nursing Home Medicaid may have a different income limit than Medicaid Home and Community-Based Services, and these may differ from the Aged, Blind, and Disabled Medicaid income limits.
In addition to income, states may also set resource limits for Medicaid eligibility. Resources can include things like bank accounts, cash, stocks, and bonds. Some states have a medically needy program that allows individuals with high medical expenses to become eligible by \"spending down\" their income to meet the state's eligibility threshold. This can be done by paying non-covered medical expenses, such as Medicare premiums and deductibles, until their income is lowered to a qualifying level.
It's important to note that certain Medicaid eligibility groups do not require a determination of income by the Medicaid agency. For example, children for whom an adoption assistance agreement is in effect under Title IV-E of the Social Security Act are automatically eligible, regardless of income. Young adults who meet the requirements as former foster care recipients are also eligible at any income level.
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Billing process and coordination of benefits
When billing for dual Medicare and Medicaid insurance, the billing process and coordination of benefits are crucial to ensuring accurate and timely reimbursement. Here's an overview:
Understanding Payers and Coordination of Benefits:
In the context of dual Medicare and Medicaid insurance, each coverage type is considered a separate "payer." The "primary payer" is responsible for paying up to the limits of its coverage, after which the remaining balance is sent to the "secondary payer." This order of payment is known as "coordination of benefits." It's important to identify which insurance is the primary payer and which is the secondary payer to ensure proper billing.
Medicare as the Primary Payer:
When Medicare is the primary payer, it pays the claim first, up to the limits of its coverage. If there is any remaining balance, it is sent to Medicaid, the secondary payer. In this case, Medicare Administrative Contractors (MACs) are responsible for processing Medicare Fee-For-Service claims for primary or secondary payment. They ensure that claims are paid correctly and avoid making primary payments in error.
Medicaid as the Primary Payer:
If Medicaid is the primary payer, it pays the claim first. Any remaining balance that is not covered by Medicaid is then sent to Medicare as the secondary payer. It's important to note that Medicaid has specific rules and requirements, including Third-Party Liability (TPL), which refers to the legal obligation of third parties to pay for expenditures for medical assistance under a Medicaid state plan. Before the Medicaid program pays for an individual's care, all other available third-party resources must meet their legal obligation to pay claims.
Data Exchange and Coordination:
To facilitate coordination of benefits, data exchange processes have been established, such as the COBA (COBA) data exchange, which includes prescription drug coverage information. These processes help consolidate the Medicare paid claim crossover process and establish national standards for transmitting enrollee eligibility data and Medicare-paid claims data. Additionally, the VDSA data exchange process includes Part D information, enabling employers to submit retiree prescription drug coverage information.
Avoiding Duplicate Payments:
In dual coverage situations, it is essential to ensure that the amount paid by both plans does not exceed 100% of the total claim. This prevents duplicate payments and ensures that each payer contributes fairly according to their coverage responsibilities.
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Frequently asked questions
To be considered dually eligible, a person must be enrolled in Medicare Part A (Hospital Insurance) and/or Medicare Part B (Medical Insurance). They must also be enrolled in either full-coverage Medicaid or one of Medicaid's Medicare Savings Programs (MSPs).
Medicare is the primary payer for dual enrollees, meaning it pays first for Medicare-covered services that are also covered by Medicaid. Medicaid then acts as the secondary payer, covering services that Medicare does not.
Dual enrollees can receive a full range of benefits from both programs, including physician visits, hospitalization, skilled nursing facility care, and durable medical equipment such as wheelchairs and walkers. Medicaid also covers long-term care and services that Medicare does not, such as non-emergency transportation and long-term nursing home care.
To be eligible for Medicare, an individual must be 65 or older, younger than 65 with disabilities, or have end-stage renal disease or Lou Gehrig's disease. Medicare has no financial restrictions. Medicaid, on the other hand, is a state and federal program for low-income individuals, families, children, pregnant women, the elderly, and people with disabilities. Eligibility requirements vary by state.








































