Glossary
Extra Help (Low-Income Subsidy / LIS)
A federal program that helps pay Part D premiums, deductibles, and copays for beneficiaries with limited income and assets.
Also known as: LIS, low income subsidy, Part D Extra Help
Quick answer
Extra Help, administered by SSA, dramatically reduces Part D costs for qualifying low-income beneficiaries — often to a few dollars per prescription.
Why it matters
Even though most TFL beneficiaries do not need Part D, those who choose to enroll (often because of an MA-PD plan) can save substantially if they qualify.
When you'll encounter it
Anytime income/assets fall within limits — application is free and can be filed online with SSA.
Impact on Medicare
Reduces Part D premiums, deductibles, and copays.
Impact on TRICARE For Life
Does not affect TFL directly, but layered with TFL's pharmacy benefit it makes any rare Part D fill very inexpensive.
Common misconceptions
- "You have to be on Medicaid to get Extra Help." — Many people qualify based on income/assets without being Medicaid-eligible.
What should I do?
- 1Apply through SSA — application is free and can be done online.
- 2Reapply yearly if your finances change.
- 3Pair with a state Medicare Savings Program for maximum help.
Continue learning
— suggested by the knowledge graph- Enrolling in Medicare: timing, methods, and the military-specific rulesWhen and how to sign up for Medicare Parts A and B — and the timing that protects your TRICARE For Life activation.
- Prescription drug coverage under TRICARE For LifeWhy TFL beneficiaries use TRICARE Pharmacy (Express Scripts), not Medicare Part D — and how the four pharmacy options compare.
- Brand-Name DrugsFDA-approved drugs sold under a manufacturer's proprietary name — middle copay tier on the TRICARE formulary.
- Coverage DecisionA formal decision by a Medicare Advantage or Part D plan about whether — and how — it will cover a service, item, or prescription.
- Creditable CoverageNon-Medicare coverage that CMS deems at least as good as a standard Medicare Part D plan — TRICARE Pharmacy qualifies, so TFL beneficiaries don't need Part D.
- Creditable Drug CoveragePrescription drug coverage that CMS certifies is at least as good as standard Medicare Part D — including TRICARE Pharmacy and VA Pharmacy.
- Expedited AppealA fast-track appeal for situations where standard timeframes could seriously jeopardize the beneficiary's health or ability to regain function.
- Express ScriptsThe pharmacy benefit manager that administers the TRICARE Pharmacy Program, including TFL home-delivery and retail-network prescriptions.
- Generic DrugsChemically identical, FDA-approved equivalents of brand-name drugs — the lowest copay tier under TRICARE Pharmacy.
- What is Extra Help and do I need it on TFL?Extra Help (LIS) lowers Part D drug costs for low-income beneficiaries. TFL beneficiaries usually don't need it because TRICARE Pharmacy is already very low cost — unless you also enroll in a Part D plan.
- What are the TRICARE Pharmacy copays for retirees?MTF pharmacy: $0. Home Delivery (90-day): low. Retail network (30-day): higher. Non-network: highest and requires a paper claim. Exact amounts adjust annually.
- How much does Medicare Part B cost?Most people pay the standard Part B premium (roughly $185/month in 2026). Higher-income retirees pay IRMAA on top. Lower-income retirees may qualify for help paying it.
- Should I enroll in Medicare Part D?No, for almost every TFL beneficiary. TRICARE Pharmacy (Express Scripts) is creditable coverage and cheaper than most Part D plans. Adding Part D usually costs more without adding benefit.
- Why did one extra dollar of income raise my Part B premium hundreds of dollars?IRMAA uses cliff thresholds, not gradual tiers. Crossing a bracket by even $1 jumps you to the next premium amount for the entire year.
Related glossary terms
Related Official Resources
Continue learning straight from the source. Every link below goes to an official government or DoD resource.
Last reviewed January 2026 against the 2026 Medicare & You and TRICARE For Life handbooks.