People treat Extra Help as a coupon printed on a Part D brochure. It is not. Extra Help—the Low-Income Subsidy—is a federal determination by the Social Security Administration. Once you have it, every Medicare drug plan has to charge you the Extra Help price: little or no premium on a benchmark plan, little or no deductible, and set copays for covered drugs.
If you already have full Medicaid, Supplemental Security Income, or a Medicare Savings Program (QMB, SLMB, or QI), you are usually “deemed” eligible. You do not apply twice. Social Security and CMS already know. The work, if there is any, is making sure your state Medicaid file is current so the deeming does not drop at the new year.
Everyone else applies at Social Security, any day of the year. The online application is Form i1020. The paper form is SSA-1020. SSA will also offer to send your information to the state for a Medicare Savings Program unless you opt out. That is often the more valuable door: MSP can pay the Part B premium and, if you qualify for QMB, it can stop providers from billing you the Medicare deductible.
Limits change every year, and Alaska and Hawaii use higher ones. Do not let a neighbor’s story talk you out of applying. SSA wants the application. If you are close, file it. If your income later falls, file it again. Extra Help also waives the Part D late-enrollment penalty, which is the quiet reason some people finally enroll in a drug plan at all.
Once Extra Help is in place, you still have to be in a Part D plan—or a Medicare Advantage plan with drug coverage—to use it. Extra Help beneficiaries can change drug plans more often than everyone else, generally once per calendar quarter in the first three quarters, and during the fall Annual Enrollment Period. The practical move is: apply for Extra Help, then compare plans with the Extra Help prices, then enroll.