Turning 65 on Medicaid managed care in New York: the month-by-month timeline

In short: about four months before Medicare starts, Social Security moves first. Around 90 days out the state’s enrollment broker flags your file, and at least 60 days out your plan mails the default enrollment letter. Extra Help and Part B premium letters follow. On the start date the D-SNP begins unless you opted out. Below is every envelope in order, with one worked example from Queens.

If you are on a Medicaid managed care plan in New York City and Medicare is coming, four different systems start moving at once: Social Security, Medicare, the state’s enrollment broker, and your plan. Each one mails you something. None of them explains the others.

The example. Maria lives in Rego Park, Queens, is in a mainstream Medicaid managed care plan whose company also has a D-SNP approved for default enrollment, and turns 65 on November 12. Her Medicare starts November 1. On every form, her county is “Queens,” because each borough is its own county. Her Medicaid is through NY State of Health, and it stays there when Medicare starts (see below). Swap in your own dates and borough; the sequence is the same. (If you get Medicare through disability, skip to the end for the differences.)

About four months out (July): Social Security

This step depends on whether you already receive Social Security checks.

• Already getting benefits at least four months before 65: Medicare.gov says “you don’t need to do anything to sign up,” and a welcome package with your Medicare card comes about three months before coverage starts. For Maria, that is early August.
• Not getting benefits: you must sign up. Your Initial Enrollment Period is seven months: the three months before your birthday month, the birthday month, and the three months after. Sign up in the three months before, and coverage starts the month you turn 65. Sign up during or after the birthday month, and it starts the next month. New York Medicaid also requires you to apply for Medicare once you can. Call Social Security at 1-800-772-1213 or use ssa.gov.

This matters for everything below. The default enrollment letter is built around your Medicare start date. If you never sign up, there is no start date and the whole process stalls.

Also around now: where your Medicaid case lives after 65

This step changed recently. Under the old rule, a NY State of Health Medicaid case was referred to the local district, which in the five boroughs is HRA, for a review under the 65-and-older rules. Older guides, including earlier versions of this page, still describe that move.

The state’s Medicaid modernization page (revised March 2026) now says that people who are dual eligible, people over 65 who are not seeking long-term care, and people applying for the Medicare Savings Program get their Medicaid through NY State of Health. It says the new system launched September 30, 2025, and that from December 2025 dual-eligible consumers and most people over 65 can apply and renew through the NY State of Health member portal. People who stay with their local department of social services (HRA in New York City, the county elsewhere) include people on SSI, people seeking community long-term care such as home care, and people in the Medicaid spend-down (excess income) program.

For Maria, who has no home care, no SSI, and no spend-down, that means her case stays with NY State of Health. If you fall into one of the groups that stay with HRA or your county, your case is handled there instead. Either way, answer any renewal notice you get. Default enrollment only works if your Medicaid stays active. For a NY State of Health case, call its Customer Service Center at 1-855-355-5777. For an HRA case, call the HRA Medicaid Helpline at 1-888-692-6116. The state says you can still get help at HRA or your local department of social services either way.

About 90 to 110 days out (late July to early August): the state finds you

You will not see this step. The state’s 2026 enrollment guide says New York Medicaid Choice identifies plan members who will become Medicare-eligible “approximately 90 to 110 days before the Medicare start date” and sends your plan a monthly file. The plan confirms you are still a member and whether you need long-term services. Nothing for you to do.

At least 60 days out (by September 1): the letter

The state says your plan “will send you a notice at least 60 days before you become eligible for Medicare.” Two things surprise people. First, the letterhead is usually the company’s Medicare plan, because federal rules make the Medicare Advantage organization send it. Same company, different name on top. Second, the letter is required to include a comparison of premiums, benefits, and cost sharing, a statement that you can decline “up to and including the day prior to the enrollment effective date,” and a description of your other Medicare options. If yours is missing those, call the plan.

For Maria, the letter arrives in late August with an effective date of November 1 and an opt-out deadline of October 31. Our letter decoder and the first-7-days plan pick up from here.

If no letter comes: not every plan sends one. The state says “Not all MMC/HARP plans offer the IB-Dual Program,” and some plans are suspended from default enrollment (the letter decoder lists the 2026 chart rows). If yours is one of them, the state’s regular Medicare transition process moves you out of the Medicaid plan when Medicare starts, to fee-for-service Medicaid or to a Managed Long Term Care plan if you get long-term services, with a notice and fair hearing rights. You then choose your Medicare coverage yourself. Call HIICAP.

September: the other envelopes

• A purple letter from Medicare about Extra Help. Because you have Medicaid, Medicare.gov says you get Extra Help with drug costs automatically. The purple letter is mailed the month after Medicare learns of your Medicaid. You do not need to apply.
• Possibly a yellow or green letter about a drug plan. These say Medicare will put you in a drug plan if you do not choose one. If you stay in the D-SNP, its Part D coverage is your drug plan and you can ignore these. If you opt out, this is how you end up with a drug plan without choosing one.
• Nothing yet about your Part B premium. See “after the start date” below.

30 days out (early October): decide

Staying requires no action; the state says so. Opting out requires calling the plan or writing to it before the deadline, and choosing your Medicare coverage so there is no gap. Use the decision guide and the phone scripts. HIICAP at 1-800-701-0501 will compare both setups for free. In Queens, Maria can also book an in-person appointment through NYC Aging Connect; our Queens page lists the sites.

The start date (November 1): what actually happens

• Medicare Part A and B begin. Medicare now pays first for medical care; Medicaid pays after.
• If you stayed, the D-SNP begins the same day and your Medicaid plan continues. The state handbook says the new ID card “should arrive within 14 days after your enrollment date,” and the welcome letter is proof of membership until then.
• Your cost sharing for Medicare-covered services should be $0. Federal law bars providers from billing Qualified Medicare Beneficiaries for Medicare copays and deductibles.
• Any drug not on the D-SNP’s list can be filled temporarily during your first 90 days while you and your doctor sort it out.
• If you opted out, Original Medicare (or the plan you chose) begins, and your Medicaid moves to fee-for-service. Use your Medicaid card with providers who take Medicaid.

After the start date: the Part B premium and the renewal

Medicare Part B costs $202.90 a month in 2026, and Social Security normally deducts it from your check. With Medicaid, New York should pay it for you through the Medicare Savings Program (the state “buy-in”). For 2026 the QMB income line is $1,836 a month for one person, and there is no asset test. State guidance says people coming from NY State of Health get the premium reimbursed at first, then are added to the buy-in. No official page says how many months that takes. Watch your Social Security payment. If the deduction is still there after a few months, ask HIICAP to check your Medicare Savings Program status. The state reimburses premiums it should have covered, but no page says how fast, so you have to notice.

Your Medicaid renewal continues on its own schedule. New York City’s renewal FAQ says NY State of Health issues renewal notices 30 days or more before the renewal date, with emails or texts about 45 days ahead, while HRA mails its renewal notices 3 months before. Missing a renewal ends Medicaid, which ends IB-Dual; the D-SNP handbook gives a 90-day grace period in the D-SNP while you fix it.

If you regret the choice

IB-Dual has no lock-in. People with Medicaid have a monthly chance to move to Original Medicare plus a drug plan, and people with full Medicaid have a monthly chance to join an aligned integrated D-SNP. Returning to your Medicaid managed care plan after leaving it is possible only through a plan pathway. Ask before you leap.

The disability version

If you get Social Security Disability Insurance, Medicare.gov says Medicare starts automatically “after getting disability benefits for 24 months,” so month 25. (ALS starts with the first benefit month; kidney failure has its own rules.) Everything above applies with two differences. Your Medicare card comes on its own, so the Social Security step is done for you. And your Medicaid case does not switch to the 65-and-over rules: state guidance says people under 65 who gain Medicare “remain in the MAGI category of assistance until their Medicaid renewal.” The default enrollment letter and its 60-day timing are the same.

One-page checklist