Below are the most common Medicare terms you'll encounter — alphabetized for quick reference. Each definition is in plain English with Ohio-specific notes where relevant.
Jump to: AEP · ANOC · C-SNP · Catastrophic Coverage · Coverage Gap · D-SNP · Extra Help · FIDE-SNP · Formulary · Guaranteed Issue · HMO · IEP · IRMAA · MA-PD · Medicaid · Medigap · MOOP · MSP · OEP · Original Medicare · Part A · Part B · Part C · Part D · PPO · Prior Authorization · QMB · SEP · SLMB · TRICARE for Life
AEP — Annual Enrollment Period
October 15 through December 7 each year. Medicare's main enrollment window for changing Medicare Advantage plans, switching between MA and Original Medicare, and changing Part D plans. Changes take effect January 1.
ANOC — Annual Notice of Change
The document your Medicare Advantage or Part D plan sends each fall (typically September or October) detailing changes for the upcoming plan year — premium changes, benefit changes, network changes, formulary changes, plan terminations. Read every year before AEP; it tells you whether your plan is changing in ways that should prompt a switch.
C-SNP — Chronic Condition Special Needs Plan
A type of Medicare Advantage plan tailored for beneficiaries with specific chronic conditions like diabetes, congestive heart failure, or chronic lung disease. Benefits include specialized care management and expanded provider access for the condition. The Ohio carrier Communicare Advantage operates a C-SNP for certain qualifying conditions.
Catastrophic Coverage
The third phase of Part D coverage, reached when your out-of-pocket prescription costs hit the annual cap ($2,100 in 2026). In catastrophic coverage, your plan covers 100% of further covered drugs for the rest of the year — no further cost-sharing on your end.
Coverage Gap (Donut Hole)
Historic Part D phase where beneficiaries paid higher cost-sharing after initial coverage and before catastrophic coverage. The donut hole was eliminated in 2025 when the $2,000 out-of-pocket cap took effect; there's no longer a coverage gap in 2026.
D-SNP — Dual-Eligible Special Needs Plan
A type of Medicare Advantage plan tailored for beneficiaries who qualify for both Medicare and Medicaid (dual-eligibles). In Ohio, traditional D-SNPs have been replaced by Next Generation MyCare Ohio FIDE-SNPs since January 1, 2026; coordination-only D-SNPs (CO-DSNPs) are no longer permitted in Ohio. Read the full D-SNP guide →
Extra Help (LIS)
The Low-Income Subsidy program that dramatically reduces Part D costs for beneficiaries below federal income and asset thresholds. With Extra Help, your monthly Part D premium can be $0, your deductible is eliminated or reduced, and prescription copays are capped at a few dollars or less. Automatic for full-Medicaid recipients, MSP recipients, and SSI recipients; others can apply through Social Security.
FIDE-SNP — Fully Integrated Dual-Eligible Special Needs Plan
A type of Medicare Advantage plan that fully integrates Medicare benefits, Part D, and Medicaid benefits into one plan with one ID card and one care coordination team. In Ohio, Next Generation MyCare Ohio plans (Anthem, Buckeye, CareSource, Molina) are FIDE-SNPs launched January 1, 2026.
Formulary
A Part D plan's list of covered drugs, organized into tiers (typically 1 through 5 or 6). Tier 1 drugs are cheapest; specialty tiers (5 or 6) are most expensive. Formularies change annually — what's covered this year may not be covered next year, or may move to a different tier.
Guaranteed Issue
Federal protection that requires Medigap carriers to issue you a policy without medical underwriting in specific circumstances — your initial Medigap Open Enrollment Period (first 6 months on Part B at 65+), loss of employer coverage, MA plan termination, moving out of plan service area, and others. Outside guaranteed-issue, Ohio Medigap carriers can underwrite.
HMO — Health Maintenance Organization
A Medicare Advantage network structure where you pick a primary care doctor who coordinates referrals to in-network specialists. Out-of-network care is generally not covered except in emergencies. Lowest premiums, least flexibility.
IEP — Initial Enrollment Period
The 7-month window around your 65th birthday during which you can enroll in Medicare for the first time without penalty. Starts 3 months before your 65th birthday month, includes the birthday month, and ends 3 months after. The IEP is your one-time guaranteed Medigap enrollment opportunity in Ohio.
IRMAA — Income-Related Monthly Adjustment Amount
Additional monthly premium for Medicare Part B and Part D based on your modified adjusted gross income (MAGI) from two years prior. 2026 IRMAA brackets start at $109,000 single / $218,000 joint. IRMAA can add $81.20 to $487 per month to your Part B premium and $14.50 to $91.00 to your Part D premium. Read the full IRMAA guide →
MA-PD — Medicare Advantage Prescription Drug Plan
A Medicare Advantage plan that includes Part D prescription drug coverage. Most MA plans are MA-PD; a smaller number are MA-only (for beneficiaries who get drug coverage separately, like through VA or employer).
Medicaid
State-federal program providing health coverage for low-income individuals. In Ohio, administered by Ohio Department of Medicaid through county Job & Family Services offices. Full Medicaid makes you dual-eligible (Medicaid + Medicare); Medicaid Savings Programs provide partial assistance even without full Medicaid.
Medigap (Medicare Supplement)
Private insurance that pays for cost-sharing Original Medicare leaves behind — Part A and Part B deductibles, coinsurance, copays. Standardized by federal law into 10 plan letters (A, B, C, D, F, G, K, L, M, N) plus high-deductible variants of F and G. Ohio has 12 Medigap plans on the market for 2026. Read the full Medigap guide →
MOOP — Maximum Out-of-Pocket
The annual cap on what you'll pay for in-network care in a Medicare Advantage plan. 2026 federal maximum: $9,250 in-network. Once you hit the cap, the plan covers 100% of further in-network costs for the year. Each MA plan can set its own MOOP at or below the federal max. Read the full MOOP guide →
MSP — Medicare Savings Program
State-administered programs that help low-income Medicare beneficiaries pay Medicare premiums, deductibles, and cost-sharing. Three levels in Ohio: QMB (Qualified Medicare Beneficiary), SLMB (Specified Low-Income Medicare Beneficiary), QI (Qualifying Individual). Income limits apply; asset tests apply for some. Apply through your county JFS.
OEP — Medicare Advantage Open Enrollment Period
January 1 through March 31 each year. Allows MA enrollees to make one plan change — switch to a different MA plan, or drop MA and return to Original Medicare. Does not allow Original Medicare enrollees to switch to MA. Changes take effect the first of the month after enrollment.
Original Medicare
Medicare Parts A (hospital) and B (medical) administered directly by the federal government, as distinct from Medicare Advantage which is administered by private insurance carriers. Original Medicare has no networks; any Medicare-accepting provider sees you. Typically paired with a Medigap policy for cost-sharing protection and a stand-alone Part D plan for drug coverage.
Part A — Hospital Insurance
Covers inpatient hospital care, skilled nursing facility care (after a qualifying hospital stay), hospice, and some home health. Free for most enrollees with sufficient work history. 2026 inpatient deductible: $1,736 per benefit period.
Part B — Medical Insurance
Covers outpatient medical care, doctor visits, durable medical equipment, preventive services, mental health, and some home health. 2026 standard premium: $202.90/month (more with IRMAA). 2026 annual deductible: $283. You typically pay 20% coinsurance after the deductible.
Part C — Medicare Advantage
Private alternative to Original Medicare that bundles Parts A, B, and often D into a single plan, sold by insurance carriers approved by Medicare. 'Part C' is the older formal term; everyone calls it Medicare Advantage now.
Part D — Prescription Drug Coverage
Outpatient prescription drug coverage, either as a stand-alone PDP paired with Original Medicare or built into a Medicare Advantage plan (MA-PD). 2026 features: $2,100 annual out-of-pocket cap, $615 maximum deductible, $38.99 national base premium used for IRMAA calculations. Ohio has 19 stand-alone Part D plans.
PPO — Preferred Provider Organization
A Medicare Advantage network structure that lets you see any provider, in- or out-of-network, but in-network costs less. No referrals required for specialists. Usually higher premiums than HMO; more flexibility.
Prior Authorization
Requirement that your Medicare Advantage or Part D plan approve a service or medication before it's covered. Most common for expensive specialty care, certain medications, and elective procedures. Your doctor's office submits the prior auth request; the plan approves or denies within specified timeframes.
QMB — Qualified Medicare Beneficiary
The most comprehensive Medicare Savings Program. Medicaid pays your Medicare Part A and B premiums, deductibles, coinsurance, and copayments. 2026 income limits: roughly $1,304/month single, $1,762/month married couple. Asset limits apply. Apply through your Ohio county JFS.
SEP — Special Enrollment Period
Periods outside the IEP, GEP, or AEP during which you can enroll in or change Medicare coverage without penalty due to specific circumstances — losing employer coverage, moving, plan termination, becoming dual-eligible, and others. Each SEP has its own rules about duration and what changes are allowed.
SLMB — Specified Low-Income Medicare Beneficiary
A Medicare Savings Program that pays your Part B premium. Less comprehensive than QMB. 2026 income limits: roughly $1,562/month single, $2,114/month married couple. Asset limits apply. Apply through your Ohio county JFS.
TRICARE for Life (TFL)
Comprehensive secondary insurance for military retirees that wraps around Medicare. Medicare pays first, TFL pays second, covering most of Medicare's cost-sharing. Requires Medicare Part B enrollment to use. No monthly TFL premium for eligible retirees.