Medicare glossary for Oklahoma

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ABN (Advance Beneficiary Notice of Noncoverage)

A form a doctor, lab or supplier with Original Medicare gives you before a service when they think Medicare may not pay for it. If you sign it and get the service, you may have to pay if Medicare denies the claim. You can still ask them to bill Medicare so you keep your right to appeal.

ADvantage waiver

A SoonerCare home and community-based services program for people 65 and older and adults 21 and older with physical disabilities who meet the nursing-facility level of care but can live safely in their own or a family member's home. It covers services such as case management, personal care, adult day health, respite, home-delivered meals, skilled nursing and home modifications. You must qualify financially for SoonerCare, and Oklahoma Human Services nurses decide the level of care. Despite the name, it isn't Medicare Advantage. See the ADvantage waiver in Oklahoma.

AEP (Annual Enrollment Period)

October 15 to December 7 each year. You can join, switch or drop a Medicare Advantage plan or a Part D drug plan, and changes start January 1. Medicare also calls it the Open Enrollment Period. The AEP for 2027 coverage runs October 15 to December 7, 2026. See Medicare open enrollment in Oklahoma.

ANOC (Annual Notice of Change)

A notice your Medicare Advantage or Part D plan sends each fall listing what changes on January 1: premiums, copays, the drug list and the network. If your plan is leaving your county, you get a non-renewal notice instead. Read it before the Annual Enrollment Period ends on December 7.

Appeal

A request to review a decision not to cover or pay for a service, item or drug. Medicare appeals have five levels, and the first step and deadline are printed on your notice. See Medicare appeals in Oklahoma.

Appendix C-1

Oklahoma Human Services' table of Maximum Income, Resource, and Payment Standards. It lists the monthly income and resource limits for SoonerCare programs for people who are 65 or older, blind or disabled, including the Medicare Savings Programs (Schedules VI, VII and VII.A) and nursing-facility and ADvantage care (Schedule VIII). OKDHS updates it when federal amounts change.

Assignment

A provider's agreement to accept the Medicare-approved amount as full payment for covered services. If your doctor accepts assignment, you pay only your deductible and coinsurance, and the doctor bills Medicare for you.

Benefit period

How Original Medicare measures your use of hospital and skilled nursing care. It starts the day you're admitted as an inpatient and ends when you've had no inpatient or skilled nursing care for 60 days in a row. You pay the Part A deductible ($1,736 in 2026) for each benefit period, so you can owe it more than once a year.

BFCC-QIO

Short for Beneficiary and Family Centered Care Quality Improvement Organization. See QIO.

CMS (Centers for Medicare & Medicaid Services)

The federal agency that runs Medicare, approves Medicare Advantage and Part D plans, and oversees state Medicaid programs such as SoonerCare. Social Security handles Medicare sign-up.

Coinsurance

Your share of a covered cost, as a percentage. After the Part B deductible, you usually pay 20% of the Medicare-approved amount for doctor visits and outpatient care under Original Medicare.

Copayment (copay)

A set dollar amount you pay for a service or prescription, such as a doctor visit or a 30-day supply of a drug. Medicare Advantage and Part D plans set their own copays.

Coverage determination

A Part D plan's decision about whether it will cover a drug and how much you pay. You can ask for one, including an exception to the plan's formulary or rules, and appeal if the answer is no.

Creditable coverage

Drug coverage expected to pay on average at least as much as standard Part D. Keeping creditable coverage, for example from a job, the VA, TRICARE or the Indian Health Service and tribal health programs, protects you from the Part D late enrollment penalty. Your plan tells you each year in a creditable coverage notice; IHS has its own creditable coverage letter.

Critical Access Hospital

A Medicare designation for small rural hospitals, generally far from other hospitals, with a limited number of inpatient beds and 24-hour emergency care. Some rural Oklahoma hospitals have this designation, and Medicare covers care there as at other hospitals. See rural hospitals and telehealth in Oklahoma.

D-SNP (Dual Eligible Special Needs Plan)

A Medicare Advantage plan only for people who have both Medicare and Medicaid. D-SNPs coordinate the two programs and must have a contract with the state Medicaid agency, which in Oklahoma is the Oklahoma Health Care Authority. For 2027 there are 27 special needs plans of all types in Oklahoma (CMS plan data). See dual eligible special needs plans in Oklahoma.

Deductible

What you pay before Medicare or your plan starts to pay. In 2026 the Part B deductible is $283 a year, the Part A deductible is $1,736 per benefit period, and Part D plans can have a deductible of up to $615.

Dual eligible

A person who has both Medicare and Medicaid. Full dual eligibles get full SoonerCare benefits; partial dual eligibles get help only through a Medicare Savings Program (SoonerCare Supplemental). Medicare pays first, then SoonerCare. See SoonerCare and Medicare.

EGID (Employees Group Insurance Division)

The division of the Oklahoma Health Care Authority (OHCA; until July 2024, the Office of Management and Enterprise Services) that runs group health, dental and vision coverage for state employees and participating education and local government employers, and their retirees. For retirees with Medicare it offers the HealthChoice Medicare supplement plans and some Medicare Advantage options. See state and teacher retirees and Medicare.

EOB (Explanation of Benefits)

A statement from a Medicare Advantage or Part D plan showing the services or drugs it paid for, what it paid and what you may owe. It is not a bill. Part D EOBs also show your progress toward the yearly out-of-pocket cap.

Evidence of Coverage (EOC)

The full legal description of what a Medicare Advantage or Part D plan covers, what you pay, and your rights and appeal steps. Plans send it each fall for the next year. It has more detail than the Summary of Benefits.

Excess charge

The extra amount a doctor who doesn't accept assignment can bill you, above the Medicare-approved amount, under Original Medicare. Federal law caps it at 15% over the amount Medicare allows for that doctor. Medigap Plans F and G cover excess charges.

Extra Help

A federal program, also called the Part D Low-Income Subsidy, that helps pay Part D premiums, deductibles and copays. In 2026 the yearly income limit is $23,940 for one person, and the resource limit is $16,590. People with full SoonerCare, a Medicare Savings Program or Supplemental Security Income qualify automatically; others apply through Social Security. Try the savings programs screener.

Formulary

A plan's list of covered drugs, usually sorted into tiers. Formularies differ from plan to plan and can change each year, so check that your drugs are on it before you join.

GEP (General Enrollment Period)

January 1 to March 31 each year, for people who missed their Initial Enrollment Period and don't qualify for a Special Enrollment Period. Coverage starts the month after you sign up, and a late enrollment penalty may apply.

Guaranteed issue rights

Situations in which a Medigap company must sell you a policy and can't charge more for health conditions, for example when your Medicare Advantage plan leaves your area or stops offering coverage. If your plan is ending in 2027, you have this right within 63 days after your plan coverage ends. See Medigap in Oklahoma and plans ending in 2027.

HealthChoice

The name of the health plans EGID offers. Retirees with Medicare can choose a HealthChoice Medicare supplement plan, offered as a High Option and a Low Option, both with Part D drug coverage. Medicare pays first; HealthChoice pays your Part A hospital deductible, and after you meet the Part B deductible it pays the 20% Part B coinsurance. You need Part A to join, and EGID says the plan pays as if you have Part B even if you don't. The Teachers' Retirement System of Oklahoma pays a monthly premium supplement for eligible retirees. See HealthChoice Medicare retiree options.

HMO (Health Maintenance Organization)

A type of Medicare Advantage plan that generally requires you to use doctors and hospitals in its network, except for emergencies and urgently needed care. Some HMOs require referrals for specialty care.

Hospice

Comfort care for someone with a terminal illness whose doctor certifies a life expectancy of six months or less. Part A covers it, including in a Medicare Advantage plan, and you can get it at home or in a facility.

I/T/U

Short for the three parts of the Indian health system: the Indian Health Service (I), tribal health programs run by tribal nations and tribal organizations (T), and urban Indian organizations (U). Prescription drug coverage through I/T/U counts as creditable coverage for Part D, and help with Part D cost sharing from I/T/U pharmacies counts toward the yearly out-of-pocket cap. See tribal health and Medicare in Oklahoma.

IEP (Initial Enrollment Period)

Your first chance to sign up for Medicare: seven months that start three months before the month you turn 65 and end three months after it. Signing up before your birthday month means coverage starts the month you turn 65. See turning 65 in Oklahoma.

IHS (Indian Health Service)

The federal agency in the U.S. Department of Health and Human Services that provides health care to members of federally recognized tribes. Its Oklahoma City Area serves Oklahoma, Kansas and parts of Texas through federally operated hospitals and clinics, tribally operated programs and urban Indian clinics. IHS is not health insurance. IHS facilities bill Medicare and Medicaid for covered care they give people enrolled in those programs. See IHS, Medicare and tribal health plans compared.

Inpatient

Formally admitted to a hospital on a doctor's order. Inpatient care is covered by Part A. Staying overnight doesn't by itself make you an inpatient; see observation status.

IRMAA (Income-Related Monthly Adjustment Amount)

An extra amount added to Part B and Part D premiums for people with higher income. For 2026 it applies when modified adjusted gross income from your 2024 federal tax return was above $109,000 (single) or $218,000 (married filing jointly). Only your federal return counts; your Oklahoma state return isn't used. The brackets are cliffs: one dollar over a line moves you to the next amount. Try the IRMAA calculator.

Late enrollment penalty

An amount added to your premium if you sign up late. For Part B it is 10% for each full 12 months you could have had Part B but didn't, usually for as long as you have Part B. For Part D it applies after 63 days or more in a row without Part D or creditable coverage. See the penalty calculator.

Lifetime reserve days

Sixty extra hospital days Original Medicare covers over your lifetime after day 90 of a hospital stay. In 2026 you pay $868 for each one you use. Once used, they don't come back.

MA OEP (Medicare Advantage Open Enrollment Period)

January 1 to March 31 each year. If you're in a Medicare Advantage plan, you can switch to another one or go back to Original Medicare (and join a Part D plan) once during this time. People new to Medicare Advantage also get it during their first three months of Medicare.

Medicare Advantage (Part C)

Plans from private companies approved by Medicare that provide your Part A and Part B coverage, usually with drug coverage, through a network. Plans are approved county by county; for 2027, 9 companies offer 50 Medicare Advantage plans open to everyone with Medicare in Oklahoma (CMS plan data), and seven western and Panhandle counties have only special needs plans. See Medicare Advantage in Oklahoma.

Medicare-approved amount

The amount Medicare sets as payment for a covered service. Your coinsurance is figured from it. A provider who accepts assignment takes it as full payment.

Medicare Prescription Payment Plan

An option in every Medicare drug plan that lets you pay your Part D out-of-pocket costs in monthly bills from your plan instead of all at once at the pharmacy. It doesn't lower what you owe; it spreads it over the year. See the drug cap estimator.

Medicare Summary Notice (MSN)

A statement Original Medicare mails every four months if you had services, listing what providers billed, what Medicare paid and the most you may owe. It's not a bill, and it explains how to appeal. You can also see claims in your Medicare.gov account.

Medigap (Medicare Supplement Insurance)

Private insurance that works with Original Medicare to pay some of what it leaves, such as deductibles and the 20% coinsurance. Plans are standardized by letter (A, B, C, D, F, G, K, L, M, N), so the same letter has the same benefits from every company; prices differ. The Oklahoma Insurance Department regulates Medigap in Oklahoma. See Medigap in Oklahoma.

Medigap open enrollment period

Six months that start the first month you're both 65 or older and enrolled in Part B. During it, a Medigap company must sell you any policy it offers in Oklahoma, regardless of your health.

MOOP (maximum out-of-pocket limit)

The most you pay in a year for covered Part A and Part B services in a Medicare Advantage plan. CMS sets the highest limit plans may use ($9,250 for in-network services in 2026); each plan sets its own. Original Medicare has no such limit.

MSP (Medicare Savings Programs)

State programs that pay Medicare premiums, and for some people deductibles and coinsurance. In Oklahoma they are part of SoonerCare, which calls them SoonerCare Supplemental: QMB, SLMB and QI-1. Oklahoma Human Services checks both income and resources; in 2026 the resource limit is $9,950 for one person and $14,910 for a couple. See Medicare Savings Programs in Oklahoma.

Network

The doctors, hospitals, pharmacies and other providers a plan contracts with. Medicare Advantage networks are local, which matters if you live in a rural county with few providers nearby or get care across the state line in Arkansas, Kansas or Texas.

Observation status

Hospital care as an outpatient while doctors decide whether to admit you. It's billed under Part B, and days under observation don't count toward the three inpatient days needed for Original Medicare to cover skilled nursing care. If you're under observation more than 24 hours, the hospital must give you a Medicare Outpatient Observation Notice (MOON).

OHCA (Oklahoma Health Care Authority)

The state agency that runs SoonerCare, Oklahoma's Medicaid program, including SoonerCare Supplemental (the Medicare Savings Programs) and the ADvantage waiver. OHCA writes SoonerCare's rules in Title 317 of the Oklahoma Administrative Code. The SoonerCare Helpline is 1-800-987-7767. For people 65 and older or with disabilities, Oklahoma Human Services takes applications and decides eligibility.

OKDHS (Oklahoma Human Services)

The state agency, formerly called the Oklahoma Department of Human Services, that decides SoonerCare eligibility for people who are 65 or older, blind or disabled, including the Medicare Savings Programs, and that runs aging services in Oklahoma. You apply through OKDHSLive or at an OKDHS Human Services Center. Its main number is (405) 522-5050.

OKDHSLive

Oklahoma Human Services' online application site, okdhslive.org, where people 65 and older or with disabilities can apply for SoonerCare, including the Medicare Savings Programs. OKDHS follows up with an interview in person or by phone.

OID (Oklahoma Insurance Department)

The state agency that licenses insurance companies and agents in Oklahoma and regulates Medigap policies sold here. You can verify an agent's license or file a complaint about an insurance company or agent with OID. It also runs the Oklahoma Senior Medicare Patrol.

OMES (Office of Management and Enterprise Services)

Oklahoma's state agency for budget, purchasing, technology and employee benefits. Its Employees Group Insurance Division (EGID) offers HealthChoice and other coverage to state and participating public employees and retirees.

Original Medicare

Part A and Part B, run by the federal government. You can use any doctor or hospital in the U.S. that accepts Medicare, and you can add a Medigap policy and a Part D plan.

OTRS (Teachers' Retirement System of Oklahoma)

The retirement system for Oklahoma public school and education employees. Members with at least ten years of creditable service can keep their employer's health insurance into retirement, and OTRS pays a monthly premium supplement toward it, sent either with your HealthChoice premium or to your local employer's plan. OTRS doesn't pay your Part B premium. See state and teacher retirees and Medicare.

PACE (Program of All-Inclusive Care for the Elderly)

A Medicare and Medicaid program that provides medical care and long-term services through one local organization, for people 55 and older who need a nursing-home level of care but can live safely at home. PACE is offered only where a PACE organization operates, which in Oklahoma is a limited number of areas; check Medicare.gov or OHCA for whether one serves your ZIP code.

Part A (hospital insurance)

Covers inpatient hospital stays, skilled nursing care after a qualifying stay, hospice and some home health care. Most people pay no premium for Part A because they or a spouse paid Medicare taxes for at least 10 years. See Part A.

Part B (medical insurance)

Covers doctor visits, outpatient care, lab tests, durable medical equipment and preventive services. The standard premium is $202.90 a month in 2026. See Part B.

Part D (prescription drug coverage)

Drug coverage from private plans, either a standalone Part D plan with Original Medicare or as part of a Medicare Advantage plan. In 2026 your out-of-pocket costs for covered drugs are capped at $2,100 for the year, and covered insulin costs no more than $35 for a month's supply. For 2027, 9 standalone Part D plans are offered in Oklahoma. See Part D in Oklahoma.

PFFS (Private Fee-for-Service plan)

A type of Medicare Advantage plan that sets how much it pays providers. Some PFFS plans have networks; with others you can see any Medicare provider who agrees to the plan's terms before each visit.

PPO (Preferred Provider Organization)

A type of Medicare Advantage plan with a network that also pays for covered care outside the network, usually at a higher cost to you.

Premium

The amount you pay each month for coverage, such as the Part B premium or a plan's premium. If you have a Medicare Advantage plan, you keep paying your Part B premium.

Preventive services

Care to prevent illness or find it early, such as flu shots, screenings and the yearly wellness visit. Many are covered by Part B with no cost to you when the provider accepts assignment.

Prior authorization

Approval you or your provider must get from a plan before it will cover a service or drug. Medicare Advantage and Part D plans use it; Original Medicare uses it only for a few services.

Purchased/Referred Care (PRC)

The IHS program that may pay for medical or dental care you get away from an IHS or tribal facility, such as from a specialist or an outside hospital. It isn't an entitlement: you must meet residency, notification and medical-priority rules, and you must use other coverage you have, such as Medicare or Medicaid, first. That is one reason IHS works to help eligible patients enroll in Medicare and Medicaid.

QI-1 (Qualifying Individual)

A Medicare Savings Program that pays your Part B premium, for incomes above 120% and up to 135% of the federal poverty level, within Oklahoma's resource limit. OHCA says it's only for people who don't qualify for full-benefit SoonerCare.

QIO (Quality Improvement Organization)

An organization Medicare contracts with to review the quality of care. The kind you deal with directly is the Beneficiary and Family Centered Care QIO (BFCC-QIO), which handles fast appeals when you think a hospital is discharging you too soon or your skilled nursing, home health or hospice services are ending too soon, and reviews quality-of-care complaints. For Oklahoma (Medicare Region 6) it is Acentra Health, at 888-315-0636. Your notice, such as "An Important Message from Medicare About Your Rights," also names it.

QMB (Qualified Medicare Beneficiary)

A Medicare Savings Program that pays Part A premiums (if you owe one), Part B premiums, and Medicare deductibles, coinsurance and copays, for incomes up to 100% of the federal poverty level within Oklahoma's resource limit. Providers may not bill people in QMB for Medicare-covered cost sharing.

QMBP (Qualified Medicare Beneficiary Plus)

The name Oklahoma's rules (OAC 317:35-7-40) and OKDHS's Appendix C-1 use for the QMB eligibility group. The income limit is 100% of the federal poverty level plus the monthly income disregard.

Referral

An order from your primary care doctor for specialty care, such as a visit to a cardiologist. Some Medicare Advantage HMOs require one; Original Medicare doesn't. IHS and tribal facilities use referrals for Purchased/Referred Care.

Rural Emergency Hospital (REH)

A Medicare provider type, available since 2023, for rural hospitals that stop inpatient care but keep 24-hour emergency and outpatient services. Medicare covers emergency and outpatient care there. See rural hospitals and telehealth in Oklahoma.

SEP (Special Enrollment Period)

A chance to sign up for or change coverage outside the usual windows because of a life event, such as moving, losing job-based coverage, your plan leaving your area, a disaster declaration for a tornado or ice storm, or getting SoonerCare or Extra Help. If your plan is ending in 2027, your SEP runs through February 28, 2027; choose by December 31 to avoid a gap. See enrollment periods.

Senior Medicare Patrol (Oklahoma SMP)

The Oklahoma part of the national Senior Medicare Patrol program, funded by the federal Administration for Community Living and run in Oklahoma by the Oklahoma Insurance Department, that helps people with Medicare spot and report fraud, errors and abuse, such as charges for care you never got. See Medicare fraud in Oklahoma.

Service area

The counties where a Medicare Advantage or Part D plan is offered. You must live in the service area to join, and a plan can disenroll you if you're away more than six months.

Skilled nursing facility (SNF)

A facility with skilled nursing or rehab staff. Original Medicare covers up to 100 days per benefit period after a qualifying inpatient stay of at least three days; in 2026 you pay $217 a day for days 21 to 100. Medicare doesn't cover long-term custodial care; in Oklahoma, SoonerCare may for people who qualify.

SLMB (Specified Low-Income Medicare Beneficiary)

A Medicare Savings Program that pays your Part B premium, for incomes above 100% and up to 120% of the federal poverty level, within Oklahoma's resource limit.

SNP (Special Needs Plan)

A Medicare Advantage plan limited to people with certain needs: both Medicare and Medicaid (D-SNP), certain chronic conditions (C-SNP), or living in an institution (I-SNP). For 2027 there are 27 special needs plans in Oklahoma (CMS plan data).

SoonerCare

Oklahoma's Medicaid program, run by the Oklahoma Health Care Authority. For people with Medicare, full SoonerCare pays after Medicare for covered services and can cover long-term care that Medicare doesn't, such as nursing-facility care and the ADvantage waiver. Oklahoma Human Services decides eligibility for people 65 and older or with disabilities. See SoonerCare and Medicare and SoonerCare vs Medicare.

SoonerCare Supplemental

OHCA's name for the Medicare Savings Programs in Oklahoma (QMB, SLMB and QI-1). It may help pay Medicare premiums and, for QMB, deductibles and coinsurance. Apply with Oklahoma Human Services.

Step therapy

A plan rule that you try a lower-cost drug first before it covers a similar, higher-cost drug. You or your prescriber can ask for an exception.

Summary of Benefits

A short document showing a Medicare Advantage or Part D plan's main costs and covered services. Read it with the Evidence of Coverage before you choose.

Tier

A level on a plan's formulary. Drugs on lower tiers usually cost you less than drugs on higher tiers.

TPMO (third-party marketing organization)

CMS's term for agents, agencies and companies that sell Medicare plans for insurance companies. Benefits Life, the publisher of this site, is a TPMO, which is why plan pages and calculators show the CMS notice about the plans we represent.

Tribal health program

Health care run by a tribal nation or tribal organization, often under an agreement with IHS, ranging from large hospitals to small clinics and behavioral health programs. In Oklahoma many tribal nations run their own health systems. Tribal programs can bill Medicare for covered care, and their drug coverage counts as creditable for Part D. See tribal health and Medicare in Oklahoma.

TRICARE For Life

Coverage for military retirees and eligible family members with Medicare that pays after Medicare. You must have Part A and Part B to keep it. See veterans, TRICARE and military retirees.

Urgently needed care

Care for a sudden illness or injury that isn't an emergency but can't wait. Medicare Advantage plans must cover it when you're temporarily outside the plan's service area, in the U.S.

VA health care

Care from the Department of Veterans Affairs at VA medical centers and clinics, including in Oklahoma City and Muskogee. VA and Medicare don't coordinate payment: VA pays for care at VA facilities, Medicare for care elsewhere. VA drug coverage is creditable for Part D.

Visitor/traveler program

An option some Medicare Advantage plans offer that lets you stay enrolled while you're out of the service area within the U.S. for more than six months, up to 12. See moving to Oklahoma with Medicare.

Sources

• Medicare.gov — Glossary
• CMS — 2026 Medicare Parts A & B premiums and deductibles
• Oklahoma Human Services — Appendix C-1, Maximum Income, Resource, and Payment Standards
• Oklahoma Human Services — Program FAQs (OKDHSLive, SoonerCare Helpline)
• Oklahoma Health Care Authority — SoonerCare Supplemental
• Oklahoma Health Care Authority — OAC 317:35-7-40, Qualified Medicare Beneficiary Plus
• Oklahoma Health Care Authority — ADvantage Waiver Program
• Employees Group Insurance Division (EGID, Oklahoma Health Care Authority) — Medicare options for retirees
• EGID — 2027 HealthChoice Medicare supplement application (PDF)
• Teachers' Retirement System of Oklahoma — Retiree health insurance
• Indian Health Service — Oklahoma City Area
• Indian Health Service — Purchased/Referred Care
• Indian Health Service — Letter on the Medicare Part D creditable coverage letter for I/T/U, October 15, 2026 (PDF)
• CMS — Medicare Prescription Drug Benefit Manual, Chapter 14 (I/T/U pharmacies and TrOOP) (PDF)
• Acentra Health — BFCC-QIO contacts by Medicare region (Region 6 includes Oklahoma)
• Oklahoma Insurance Department — File an online complaint
• Oklahoma Insurance Department — Licensing and education (verify an agent)
• Oklahoma Insurance Department — About the Senior Medicare Patrol
• Administration for Community Living — Senior Medicare Patrol
• CMS — 2027 Medicare Advantage and Part D Landscape files (Oklahoma plan counts)

Frequently asked questions

Medicare in your Oklahoma county

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