Got a letter about “default enrollment” into a D-SNP? Here’s what it usually means in New York

The short version

If you are in a Mainstream Medicaid Managed Care (MMC) plan or a HARP, and you are about to get Medicare for the first time, your health plan may send a notice saying you will be automatically enrolled into that company’s aligned Medicare D-SNP, unless you opt out before the start date.

When that aligned D-SNP enrollment happens and you stay in the aligned Medicaid plan, New York calls this the IB-Dual program (Integrated Benefits for Dually Eligible Enrollees). It is for people who do not need more than 120 days of certain community-based long-term services. People who need longer-term supports get a different version of the letter that points to Medicaid Advantage Plus (MAP) where available. The next section shows how to tell them apart.

Which letter do you have? IB-Dual or MAP

New York uses two model notices, and the state posts both online. Your plan fills in the names and dates, so the wording on your letter is close to the model. The state calls them the Non-LTSS Default Enrollment Notice (IB-Dual) and the LTSS Default Enrollment Notice (MAP). LTSS means long-term services and supports, such as home care. Both letters open the same way: the company “will automatically enroll you into” its D-SNP “the same day your Medicare benefits start,” and you have until a date “before” the effective date to make another choice. The difference is in the paragraph about your Medicaid.

Still not sure? Call the plan number on the letter and ask: “Does my letter put me in IB-Dual, or in a Medicaid Advantage Plus plan?” Our phone scripts have the rest of that call, and D-SNP vs. MAP explains the two products in more depth.

Not every plan sends this letter

Only Medicaid plans approved for default enrollment in your county send the notice. The state’s FAQ says it plainly: “Not all MMC/HARP plans offer the IB-Dual Program,” and a plan that offers it can still have its default enrollment switched off. That is why a neighbor with a different Medicaid plan can get a letter when you do not. Not getting one is not a sign that something went wrong.

If your plan is one of the suspended ones and Medicare is starting, you generally will not get an automatic default enrollment letter from it. Medicare starts on its own, you choose your Medicare coverage yourself, and what happens to your Medicaid plan membership follows the state’s usual rules for people who get Medicare. Ask the plan or New York Medicaid Choice what that means for you, and ask HIICAP to compare your Medicare choices. Do not assume a suspended plan means you have no options; do not assume it means you have the same options as a neighbor with an Active plan.

What “default enrollment” does not mean

• It does not mean you have no choice. You can opt out.
• It does not mean every benefit stays identical to your current Medicaid-only coverage.
• It does not mean this website enrolled you. Only CMS, your plan, and New York processes do that.

How to read the letter (checklist)

1. Look for the effective date

Find the date your new Medicare / D-SNP coverage would start. It usually matches when your Medicare begins (often the first of a month).

2. Look for the “60-day” timing

Plans approved for default enrollment are generally expected to notify you at least 60 days before that start date. If the letter just arrived, check how many days you still have.

3. Find the plan names

Your notice should name:

• Your current MMC or HARP, and
• The aligned D-SNP (Medicare Advantage) you would join, and
• On a MAP letter, the Medicaid Advantage Plus plan your Medicaid would move into.

“Aligned” means the Medicare D-SNP and the Medicaid plan are offered through the same health-plan organization so benefits can be coordinated.

4. Find the opt-out instructions

Letters should explain how to decline default enrollment, often by calling your health plan, sending a written request, or asking New York Medicaid Choice to connect you with your plan. You can typically opt out up until the day before the enrollment effective date (confirm on your letter).

5. Scan for benefit / cost-sharing differences

Good notices compare premiums, cost-sharing, and benefits between what you have now and the D-SNP. Also check whether your primary care doctor is listed as in-network for the D-SNP.

If you stay enrolled (do nothing)

• You are generally enrolled in the aligned D-SNP when Medicare starts.
• You remain in your MMC/HARP under IB-Dual, or move into the MAP plan, whichever your letter says.
• One organization coordinates more of your Medicare and Medicaid services.
• Still review the D-SNP materials (formulary, providers, prior authorization rules).

If you opt out

Per NYS DOH materials: you do not have to join the plan’s D-SNP. You can choose Original Medicare or a different Medicare Advantage plan instead.

Important tradeoff: if you opt out of the aligned D-SNP, you generally cannot stay in that MMC/HARP the same way and may move to Medicaid fee-for-service (and different long-term-care rules if you need LTSS). Ask HIICAP or New York Medicaid Choice before you decide. The stay-or-opt-out decision guide walks through the eight questions that usually settle it.

If the start date already passed

You may still have options to change Medicare coverage later (dual eligibles often have monthly Special Enrollment Periods for certain integrated plans). Rules are specific; get personal help rather than guessing from a website.

Live in New York City?

Each borough is its own county on Medicare and Medicaid paperwork, Medicaid is run citywide by HRA, and free in-person HIICAP counseling sites exist in every borough. Our borough and neighborhood pages cover the local layer, and the blog post what to do in the first 7 days turns this checklist into a one-week plan.