Medicare, Medicaid, and TRICARE

Medicare, Medicaid, and TRICARE appear frequently in billing and eligibility work because they have detailed rules and are often confused with each other. Medicare is a federal health insurance program primarily for people age 65 or older, certain younger people with disabilities, and people with specific conditions such as end-stage renal disease. Original Medicare has Part A and Part B. Part A is commonly described as hospital insurance because it covers inpatient hospital care, skilled nursing facility care under qualifying conditions, hospice, and some home health services.

Key Concepts

Part B is medical insurance and covers many physician services, outpatient services, preventive services, durable medical equipment, and medically necessary supplies. A CBCS should not assume Part A covers every facility bill or Part B covers every professional bill without checking benefit rules, medical necessity, place of service, and patient status. Medicare Part C, also called Medicare Advantage, is offered by private plans approved by Medicare. A patient enrolled in Medicare Advantage generally receives Medicare-covered benefits through that plan rather than through Original Medicare claim processing.

Many Medicare Advantage plans use networks, referrals, prior authorization, and plan-specific billing rules. The card may show a commercial payer name, but the product is still Medicare Advantage, so the claim goes to the plan, not directly to traditional Medicare. Medicare Part D covers outpatient prescription drugs through private plans. Part D is relevant to billing offices when medication coverage, pharmacy benefits, or drug-related patient questions arise, but physician-administered drugs may follow medical benefit rules instead.

Medigap, or Medicare supplement insurance, is different from Medicare Advantage.

A Medigap policy helps pay certain Original Medicare cost-sharing amounts, such as deductibles or coinsurance, according to the supplement plan. It does not provide primary Medicare benefits, does not usually use Medicare Advantage network rules, and is billed after Medicare when assignment and crossover rules apply. Medicaid is jointly funded by federal and state governments but administered by states. Eligibility may be based on income, pregnancy, disability, age, foster care status, long-term care need, or other state-defined categories.

Because states set many operational rules, CBCS staff must verify the exact Medicaid program, managed-care organization, effective date, benefit limits, and provider enrollment requirements. Some patients have fee-for-service Medicaid; many are assigned to Medicaid managed-care plans. A service covered under one state's Medicaid program may need prior authorization, referral, specific documentation, or a particular provider type. Medicaid is also commonly the payer of last resort.

Workflow and Documentation

That means other liable insurance, such as employer coverage, Medicare, liability insurance, or workers' compensation, must usually be billed first when applicable.

The office should collect all coverage information and avoid bypassing a primary payer just because the patient also has Medicaid. Medicare and Medicaid can overlap. A dual-eligible patient has Medicare and some level of Medicaid. Medicare often pays first for Medicare-covered services, and Medicaid may assist with premiums, deductibles, coinsurance, or services Medicare does not cover, depending on eligibility category and state rules. The specialist must verify both payers because dual eligibility is not one single benefit package.

TRICARE is the health program for eligible uniformed service members, retirees, and family members.

Plan options may include Prime-style managed-care arrangements, Select-style preferred provider arrangements, and other programs for specific populations. TRICARE Prime generally relies more on primary care managers, referrals, and authorizations; TRICARE Select generally permits more self-directed access but still has network and benefit rules. Active duty service members have especially strict referral and authorization expectations.

Exam Application

TRICARE for Life coordinates with Medicare for many eligible retirees and family members who have Medicare Part A and Part B, with Medicare often paying first for Medicare-covered services and TRICARE acting as a secondary payer. Exam scenarios may ask what to do when a patient says they have Medicare, Medicaid, or TRICARE but presents a managed-care card.

The correct workflow is to identify the specific program, confirm active coverage for the service date, determine the payer address or electronic payer ID, check whether the provider is enrolled or participating, review referral and authorization rules, determine other insurance, and document the verification source. Government coverage should be handled carefully because errors can create denials, overpayments, patient billing restrictions, and compliance issues.

As with the CBCS exam overall, candidates should remember that the current CBCS exam has 100 scored questions plus 25 unscored pretest questions, a 3-hour time limit, and a scaled passing score of 390; as of September 24, 2024, candidates no longer bring coding manuals to the exam, so payer concepts must be understood rather than looked up during testing.

High-Yield Checkpoints

• Government plan questions often focus on eligibility category, plan part or program type, assignment rules, covered benefits, and secondary payer order.
• Original Medicare Part A is mainly hospital insurance, Part B is medical insurance, Part C is Medicare Advantage, and Part D is outpatient prescription drug coverage.
• Medicaid is state-administered within federal rules, so eligibility, covered services, managed-care enrollment, and billing requirements vary by state.
• TRICARE covers eligible uniformed service members, retirees, and family members, with plan options that affect referrals, authorizations, and cost sharing.
• Medigap supplements Original Medicare cost sharing but does not replace Medicare or function as a Medicare Advantage plan.