Original Medicare: The Complete Guide to Texas

Original Medicare is the foundational health insurance program provided by the federal government for Americans aged 65 and older, as well as certain younger individuals with specific disabilities or conditions. If you are approaching retirement or Medicare eligibility in Texas, understanding Original Medicare is the single most critical step in securing your healthcare future. It forms the baseline upon which all other Medicare decisions—such as whether to buy a Medigap policy, enroll in a Part D prescription drug plan, or switch to a Medicare Advantage plan—are built.

In a traditional fee-for-service arrangement, Original Medicare allows you to direct your own care. The federal government pays its share of the approved amount directly to your healthcare providers, and you are billed for the remaining deductibles, coinsurance, or copayments. While this structure offers unparalleled freedom of choice regarding which doctors you see and which hospitals you use, it also exposes you to significant financial liability if you experience a major medical event without supplemental coverage.

This guide breaks down every component of Original Medicare, explaining exactly what Part A and Part B cover, what they cost, the strict rules governing when you must enroll, and how this foundational coverage interacts with the broader health insurance landscape in Texas.

The Architecture of Original Medicare

When people refer to “Medicare,” they are most often talking about Original Medicare. Enacted into law in 1965, the program was designed to provide a safety net for seniors who historically struggled to find affordable private health insurance. Today, it is administered by the Centers for Medicare & Medicaid Services (CMS), a federal agency within the Department of Health and Human Services.

Original Medicare is strictly divided into two distinct parts:

1. Medicare Part A: Often referred to as “Hospital Insurance,” this covers inpatient care, skilled nursing facilities, hospice, and some home healthcare.
2. Medicare Part B: Often referred to as “Medical Insurance,” this covers outpatient care, doctor visits, preventive services, and durable medical equipment.

It is important to understand what Original Medicare is not. It is not a comprehensive, all-in-one health plan that pays for everything. It was built with deliberate cost-sharing mechanisms designed to make the patient responsible for a portion of their healthcare utilization. Furthermore, because it is administered at the federal level, the rules, coverage guidelines, and base costs for Original Medicare are exactly the same in Texas as they are in any other state. Where your state of residence matters is in how you choose to supplement this coverage using private insurance carriers regulated by the Texas Department of Insurance.

Medicare Part A: Hospital Insurance Explained

Medicare Part A is designed to cover you when you are formally admitted into a healthcare facility for treatment. For the vast majority of Texans, Part A is “premium-free.” If you or your spouse worked and paid Medicare taxes for at least 40 quarters (roughly 10 years) over your lifetime, you do not pay a monthly premium for Part A coverage.

If you do not meet this work history requirement, you can still obtain Part A, but you will be required to pay a monthly premium based on the number of quarters you did work.

While the premium may be free, the coverage itself is subject to deductibles and copayments that operate differently than traditional private health insurance. Part A operates on a “benefit period” system rather than an annual deductible system.

Inpatient Hospital Care

When you are formally admitted to a hospital by a doctor’s order, Part A covers a semi-private room, hospital meals, skilled nursing services, and the drugs and supplies used during your inpatient stay.

However, coverage is structured around benefit periods. A benefit period begins the day you are admitted as an inpatient and ends when you have not received any inpatient hospital care or skilled nursing care for 60 consecutive days.

• Days 1–60: You must pay a significant Part A deductible for the benefit period. Once this deductible is met, Original Medicare pays 100% of covered hospital services for the first 60 days.
• Days 61–90: You are responsible for a daily copayment amount.
• Days 91 and beyond (Lifetime Reserve Days): You are responsible for a much higher daily copayment. You have a maximum of 60 lifetime reserve days that can only be used once. Once these are exhausted, you pay all costs.

Because a new benefit period begins if you go 60 days without inpatient care, it is entirely possible to pay the Part A deductible multiple times in a single calendar year if you have multiple, spaced-out hospitalizations.

Skilled Nursing Facility (SNF) Care

Part A covers care in a skilled nursing facility, but the rules are highly specific. To qualify, you must have a qualifying hospital stay of at least three consecutive inpatient days (not counting the day of discharge) immediately prior to entering the SNF.

Furthermore, the care must be for a medical condition that was treated during your hospital stay, and you must require daily skilled nursing or therapy services.

• Days 1–20: Original Medicare pays 100% of approved costs.
• Days 21–100: You pay a daily coinsurance amount.
• Days 101 and beyond: Medicare pays nothing, and you are responsible for all costs.

A crucial pitfall to avoid: Being kept in the hospital under “observation status” does not count toward your three-day inpatient requirement. You must be formally admitted as an inpatient for SNF care to be covered.

Hospice and Home Health Care

If a physician certifies that you are terminally ill with a life expectancy of six months or less, Part A covers hospice care. This includes palliative care for pain relief and symptom management, medical, nursing, and social services, and grief counseling for your family. Hospice care is generally provided at home and has very little cost-sharing, aside from minor copayments for symptom-control medications or respite care.

Part A also covers certain home health services on a part-time or intermittent basis if you are homebound and require skilled nursing or therapy. Original Medicare covers this at 100%, though any durable medical equipment provided under the home health benefit will fall under Part B and require a 20% coinsurance.

Medicare Part B: Medical Insurance Explained

While Part A covers the facilities you stay in, Medicare Part B covers the services you receive. Whether you are seeing your primary care physician for a checkup, visiting a cardiologist, receiving an MRI, or riding in an ambulance, Part B is the engine that drives your daily healthcare coverage.

Unlike Part A, everyone pays a monthly premium for Part B. The federal government sets a standard monthly premium each year. However, if your modified adjusted gross income (MAGI) from two years prior exceeds a certain threshold, you are subject to the Income-Related Monthly Adjustment Amount (IRMAA), meaning you will pay a higher premium based on your income bracket.

The 80/20 Coinsurance Model

Part B operates on a strict fee-for-service arrangement with a very straightforward math equation:

1. The Part B Deductible: You must first meet an annual Part B deductible. This amount is relatively low compared to private insurance deductibles.
2. The 20% Coinsurance: Once the annual deductible is met, Original Medicare generally pays 80% of the Medicare-approved amount for covered services. You are responsible for the remaining 20%.

Critically, there is no out-of-pocket maximum on that 20%. If you require expensive outpatient procedures, chemotherapy drugs administered in a clinic, or ongoing specialist care, 20% of the total bill can quickly amount to tens of thousands of dollars.

Covered Services Under Part B

Part B coverage is exceptionally broad, provided the services are deemed medically necessary.

• Provider Services: Visits to doctors, specialists, nurse practitioners, and physician assistants.
• Outpatient Care: Surgeries, procedures, and observation stays performed in a hospital outpatient department or ambulatory surgical center.
• Preventive Care: Medicare covers many preventive services at 100% (waiving the deductible and coinsurance) if the provider accepts assignment. This includes a “Welcome to Medicare” preventive visit in your first year, Annual Wellness Visits, bone mass measurements, cardiovascular screenings, colorectal cancer screenings, mammograms, and vaccinations for flu and pneumococcal disease.
• Durable Medical Equipment (DME): Equipment your doctor prescribes for use in your home, such as wheelchairs, walkers, hospital beds, CPAP machines, oxygen equipment, and blood sugar monitors. This falls under the 20% coinsurance rule.
• Mental Health Services: Outpatient mental health care, including visits with a psychiatrist, clinical psychologist, or clinical social worker, as well as treatment for substance abuse.
• Ambulance Services: Ground ambulance transportation to a hospital or skilled nursing facility when other transportation could endanger your health. In rare emergencies, air ambulance is also covered.
• Clinical Laboratory Services: Blood tests, urinalysis, and tissue tests are generally covered at 100%.

What Original Medicare Does Not Cover

Understanding what Original Medicare excludes is just as critical as knowing what it includes. By statute, the federal program is barred from covering several major categories of healthcare that many seniors rely on. Relying solely on Original Medicare means you will pay 100% out-of-pocket for:

• Routine Dental Care: Exams, cleanings, fillings, extractions, and dentures are not covered. Medicare only covers dental services if they are an integral part of a covered medical procedure (e.g., extracting teeth prior to radiation treatment for jaw cancer).
• Routine Vision Care: Eye exams for prescribing glasses and contact lenses are not covered, though Medicare does cover medically necessary care for eye diseases like cataracts, glaucoma, and macular degeneration.
• Hearing Aids and Routine Hearing Exams: You pay the full cost of hearing aids and the exams for fitting them.
• Long-Term Care: Custodial care—such as help with bathing, dressing, eating, and using the bathroom—is excluded. If you need to move into a nursing home simply because you can no longer manage activities of daily living, Medicare will not pay for it.
• Outpatient Prescription Drugs: The pills you pick up at a pharmacy and take at home are entirely excluded from Original Medicare.
• Foreign Travel Emergency Care: With extremely rare exceptions (such as an emergency occurring near the border where the closest hospital is in Canada or Mexico), Original Medicare does not provide coverage outside the United States.

Texas Medicare Eligibility & Enrollment

Entering the Medicare system requires strict adherence to federal timelines. Missing your enrollment windows can trigger lifelong financial penalties and dangerous gaps in your healthcare coverage.

Initial Enrollment Period (IEP)

Your primary opportunity to sign up for Original Medicare is your Initial Enrollment Period. This is a seven-month window that revolves around your 65th birthday:

• The 3 months before your birthday month.
• The month of your birthday.
• The 3 months after your birthday month.

If you are already receiving Social Security retirement benefits when you turn 65, you will be automatically enrolled in both Part A and Part B. Your red, white, and blue Medicare card will simply arrive in the mail. If you are not drawing Social Security, you must proactively apply for Medicare through the Social Security Administration (SSA).

Special Enrollment Period (SEP)

Many Texans choose to work past age 65 and remain on their employer’s health insurance. If you have “creditable” health coverage from your own current employment or your spouse’s current employment, you can generally delay enrolling in Part B without penalty.

When that employment or coverage ends (whichever happens first), you are granted an 8-month Special Enrollment Period to sign up for Part B. Utilizing this SEP protects you from late penalties and ensures continuous coverage.

General Enrollment Period (GEP)

If you missed your IEP and do not qualify for an SEP, you must wait for the General Enrollment Period, which runs from January 1 through March 31 of each year. Your coverage will take effect the first day of the month following your enrollment. Relying on the GEP usually means you will be subjected to late enrollment penalties.

The Cost of Delay: Late Enrollment Penalties

The federal government heavily incentivizes timely enrollment to maintain the financial stability of the Medicare risk pool.

• Part B Penalty: If you delay Part B without creditable coverage, your monthly premium increases by 10% for every full 12-month period you could have had Part B but didn’t sign up. This penalty does not expire; you pay it for as long as you have Part B.
• Part A Penalty: If you are required to pay a premium for Part A and you delay enrollment, your premium is increased by 10%. You will pay this higher premium for twice the number of years you delayed enrollment.

Working with Texas Carriers and Filling the Gaps

Because Original Medicare has no maximum out-of-pocket limit and excludes prescription drugs, relying on it alone exposes Texans to severe financial risk. The vast majority of beneficiaries turn to private insurance carriers to fill these gaps. The Texas Department of Insurance oversees the private companies offering these supplemental products.

Option 1: Original Medicare + Medigap + Part D

The most comprehensive way to secure your healthcare is to remain on Original Medicare, purchase a Medicare Supplement Insurance (Medigap) policy to cover the 20% coinsurance, and purchase a standalone Part D plan for prescription drugs.

Medigap policies are standardized by the federal government but sold by private carriers in Texas. A Plan G from one carrier offers the exact same medical benefits as a Plan G from another; the only difference is the premium charged. By keeping Original Medicare as your primary insurance, you retain the ability to see any doctor in the nation who accepts Medicare.

Major carriers in Texas offering Medicare products, such as Aetna Medicare, Blue Cross and Blue Shield of Texas, Humana, UnitedHealthcare, and Wellcare, provide various Medigap and Part D options that integrate seamlessly with Original Medicare’s fee-for-service model.

Option 2: Medicare Advantage (Part C)

The alternative to Original Medicare is Medicare Advantage. These are private health plans that bundle Part A, Part B, and usually Part D into a single plan, often adding extra benefits like dental and vision. In Texas, there are hundreds of available plans; across the state, beneficiaries have access to 398 real Medicare plans provided by carriers like Clover Health, CHRISTUS Health Advantage, Devoted Health, and Alignment Health Plan, among others.

When you enroll in a Medicare Advantage plan, you still have Medicare, but your coverage is administered by the private carrier rather than the federal government.

Coordination of Benefits in Texas

Understanding how Original Medicare interacts with other insurance is vital, particularly for Texans who are still in the workforce or who have retiree benefits. This concept is called “Coordination of Benefits,” and it determines who pays first (the primary payer) and who pays second (the secondary payer).

Working with Employer Coverage

If you are 65 or older, actively working, and covered by a group health plan:

• Employers with 20 or more employees: Your employer group health plan pays first, and Original Medicare pays second. Many individuals in this situation choose to delay Part B to save on premiums, relying wholly on their employer plan.
• Employers with fewer than 20 employees: Original Medicare pays first, and your employer group health plan pays second. In this scenario, it is absolutely essential that you enroll in Part A and Part B as soon as you turn 65. If you do not, your employer plan may refuse to pay for claims that Medicare should have paid, leaving you entirely responsible for the bill.

Retiree Coverage, COBRA, and TRICARE

If you have retiree insurance from a former employer, Medicare always pays first. Retiree coverage acts as the secondary payer, essentially functioning like a Medigap plan, though exact benefits vary by former employer.

If you are on COBRA (continuation coverage after leaving a job), Medicare pays first. Because COBRA is not considered active employment coverage, you cannot use it to delay Part B enrollment without triggering a late penalty.

If you use TRICARE for Life (military retiree benefits), you must have both Medicare Part A and Part B to retain your TRICARE coverage. Medicare pays first for Medicare-covered services, and TRICARE pays second.

Medicare Savings Programs in Texas

For Texans with limited income and resources, the state operates Medicare Savings Programs (MSPs) through the Texas Health and Human Services Commission. These programs—such as the Qualified Medicare Beneficiary (QMB) program, the Specified Low-Income Medicare Beneficiary (SLMB) program, and the Qualifying Individual (QI) program—help pay for Part A and Part B premiums. In the case of QMB, the state also covers deductibles, coinsurance, and copayments.

If you qualify for an MSP, you automatically qualify for the federal “Extra Help” program, which drastically reduces the costs of Medicare Part D prescription drugs.

Medicare Rights, Protections, and Appeals

Under Original Medicare, you possess guaranteed rights and protections, enforced by federal law. Foremost among these is the right to appeal any decision regarding your coverage or the amount Medicare pays for a service.

If you receive a Medicare Summary Notice (MSN) indicating that a claim was denied or only partially paid, you are not out of options. Original Medicare has a strict, five-level appeals process:

1. Redetermination: You have 120 days from the date on your MSN to request a redetermination by a Medicare Administrative Contractor (MAC)—a private company that processes Medicare claims for the region. The reviewer will be someone who did not take part in the original decision.
2. Reconsideration: If you disagree with the redetermination, you have 180 days to request a reconsideration by a Qualified Independent Contractor (QIC).
3. Administrative Law Judge (ALJ) Hearing: If the QIC denies your appeal, and the amount in controversy meets a specific minimum dollar threshold, you can request a hearing before an ALJ. This provides an opportunity to argue your case directly before a legal authority.
4. Medicare Appeals Council: If the ALJ’s decision is unfavorable, you can escalate the claim to the Medicare Appeals Council.
5. Federal District Court: The final level of appeal is a judicial review in federal court, provided your claim meets the highest minimum dollar threshold required for federal review.

Additionally, you have the right to receive an Advance Beneficiary Notice of Noncoverage (ABN). If your doctor believes Original Medicare will not pay for a specific service or item, they must provide you with an ABN before rendering the service. This document requires you to acknowledge that you may be financially responsible. If a provider fails to issue an ABN for a service Medicare denies, you may not be held liable for the cost.

Securing Your Original Medicare

Original Medicare is the starting line for your healthcare retirement strategy, but it is not the finish line. Its federal structure guarantees you access to the largest network of doctors and hospitals in Texas and nationwide, but its cost-sharing realities mandate careful planning.

Whether you choose to bolster Original Medicare with a Medigap policy and a standalone Part D plan to eliminate unpredictable out-of-pocket costs, or you decide to transition to a Medicare Advantage plan for an all-in-one approach, understanding exactly what Part A and Part B do—and don’t do—ensures you make the right choice for your clinical needs and financial stability.

Frequently Asked Questions