Open Enrollment is the one window each year where most Americans get to change their health insurance without needing a “qualifying life event” to justify it. For ACA plans, the window opens November 1 and closes January 15 in most states. Mess it up, and you’re stuck with the wrong plan for an entire year.
The people who handle Open Enrollment well don’t wing it on November 1. They prep. Here’s the checklist we walk our clients through every fall, broken down by what to do when.
Late September: The “What Do I Actually Have” Audit
The first job is figuring out what you currently have, because most people genuinely don’t remember. Pull these documents:
- Your current plan’s Summary of Benefits and Coverage (carrier sends this every year)
- Your member ID card
- Your most recent Explanation of Benefits (EOB) — the carrier sends these after each service
- Your prescription list with current dosages
Open the SBC and look at four numbers: deductible, copays, coinsurance, and MOOP. Write them down. These are the numbers you’ll compare against new plan options. If you don’t know your current numbers, you can’t tell whether a new plan is better or worse — you’re shopping blind.
Early October: The Doctor and Prescription Inventory
Make a clean list of:
- Every doctor you’ve seen in the last 18 months, with names and specialties
- Every prescription you take regularly, with exact drug name, dosage, and frequency
- Any procedures or specialist visits you know are coming in the next 12 months
- Your hospital preference — the one you’d actually want to go to if something happened tonight
This list is the single most useful piece of preparation you can do. When new plan options come out, you’re going to verify each plan against this list. If the new plan covers your primary care doctor but not your dermatologist, or covers your blood pressure medication but bumps your cholesterol drug to Tier 4, you need to know before you enroll, not after.
Mid-October: Read the Annual Notice of Change
If you’re on a Medicare Advantage or Part D plan, the carrier mails you an Annual Notice of Change (ANOC) in September or early October. Most people throw it out without opening it. Don’t.
The ANOC tells you exactly what’s changing on your plan for the next year. New premium. New copays. Drugs being added to or dropped from the formulary. Network changes. Supplemental benefit changes. It’s the carrier’s legally required disclosure of how your plan is shifting.
Read it cover to cover. Highlight anything that surprises you. Take that list into your annual review. If the changes are mild and the plan still fits you, you might choose to stay put. If the changes are material — a key drug dropped, a copay structure flipped, the network you depend on shrinking — you have a window to switch.
For ACA plans, the equivalent disclosure shows up in the renewal notice from your carrier in late October or early November. Same drill. Read it.
Late October: The Income and Household Projection
For ACA marketplace coverage, your projected Modified Adjusted Gross Income (MAGI) determines your premium tax credits. Your household size matters too. Both can change year to year.
Before Open Enrollment opens, project both for the coming calendar year:
- What’s your realistic MAGI projection? Pull last year’s tax return as a starting point, then adjust for any changes you know are coming (new job, raise, business income shifts, side hustle, retirement, etc.)
- Has your household composition changed or is it about to? New baby, divorce, kid aging out, parent moving in?
Get these projections honest. If you underproject income, you risk owing back the excess premium tax credits at tax time. If you overproject, you pay more in premium than you needed to. The marketplace will reconcile at tax time either way, but the cash flow over the year matters.
October 31: The Final Pre-Open-Enrollment Sit-Down
The day before Open Enrollment opens, you should have ready:
- Current plan summary with the four key numbers (deductible, copay/coinsurance, MOOP)
- Doctor and prescription list, current
- Household income projection for the coming year
- Hospital and specialist preferences
- Any planned procedures or major medical events on the horizon
- The ANOC or renewal notice from your current carrier, read
That stack is what an advisor needs to actually do a real review. Show up without it, and the review takes three times as long because we spend most of it gathering information you could have gathered in 20 minutes at your kitchen table.
November 1 to Mid-December: The Window of Maximum Choice
November 1 is when the new plan year’s options become viewable on the ACA marketplace. This is when the real work happens.
For ACA coverage, the deadlines that matter most:
- December 15 in most states is the deadline for coverage to start January 1. If you want unbroken coverage starting on day one of the new year, enroll by December 15.
- January 15 is the final Open Enrollment deadline in most federal marketplace states. Enroll between December 16 and January 15 and your coverage starts February 1.
Some state-based exchanges have different deadlines. If you’re in California, New York, New Jersey, Massachusetts, Rhode Island, Idaho, or DC, check your state-specific calendar.
For Medicare:
- October 15 to December 7 is the Medicare Annual Election Period (AEP). This is when you can change Medicare Advantage plans, Part D plans, or switch between Original Medicare and Medicare Advantage. December 7 is hard — miss it and you’re locked in for the year (with one exception, the Medicare Advantage Open Enrollment Period from January 1 to March 31, which has limited options).
The Comparison Step Most People Skip
The single highest-value step in Open Enrollment is putting two or three plans side by side on one sheet, with the actual numbers, and looking at total annual cost — not monthly premium.
The formula: (Monthly premium × 12) + (Realistic expected out-of-pocket spend, based on how your family actually uses care).
For a healthy single adult, expected out-of-pocket might be a few hundred dollars. For a family with a chronic condition, it might be the MOOP. Project honestly for your situation.
Then add the two. That’s your total annual cost. Compare across plans. The right plan is rarely the one with the lowest premium — it’s the one with the lowest total annual cost for how you actually use care.
A Real-Life Example
The Whitfields are a family of five in Plant City. Two adults, three kids, one with type 1 diabetes. They’d been on the same ACA plan for three years, never compared, just auto-renewed each November.
This October we did a real review for them. Pulled the formulary. The insulin their daughter uses had moved from Tier 2 to Tier 3 on their current plan for the new year — an extra $1,800 in annual drug cost. Two of their doctors had also dropped out of network. Their hospital was still in but their pediatrician’s whole practice had switched carrier networks.
We compared their current plan against three alternatives. The plan that came out cleanest had a $40 higher monthly premium but kept their pediatrician, kept the insulin on Tier 2, and had a lower MOOP. Net annual savings: roughly $2,400 plus they kept the doctor relationships their kids actually had.
If they’d auto-renewed, none of that would have surfaced until they were already locked in for another year.
What This Means for You
Open Enrollment isn’t a 10-minute exercise on the marketplace website. It’s an annual financial decision worth thousands of dollars to most families, and the only way to make it well is to prepare for it.
Three rules:
- Don’t auto-renew without comparing. Auto-renewal is the marketplace’s way of making life easy for people who haven’t done their homework. It rarely produces the best outcome.
- Don’t shop by premium alone. Total annual cost is the right metric. Premium is one piece of that.
- Don’t do this on December 14. The advisors who can actually help you are slammed in mid-December. Start in October.
We do healthcare reviews year-round, but Open Enrollment season is when the difference between a real review and a quick enrollment shows up the most. Get on the calendar early. Coast to coast, all 37 states we’re licensed in. No call centers, no pressure.
Want a real conversation about this? Book a Healthcare Review — one hour, free, plain English.