How to Read Your Medicare Annual Notice of Change (ANOC) for 2027: The 8 Sections That Decide Whether You Should Switch Plans This Fall

Sometime between September 15 and September 30, 2026, an envelope from your Medicare Advantage or Part D insurer will land in your mailbox with "Annual Notice of Change" across the top. Most people scan the cover letter, notice the premium didn't change dramatically, and drop the whole thing into a drawer. That drawer is where thousands of dollars of avoidable 2027 costs quietly begin — a maintenance drug that quietly moved from Tier 2 to Tier 4, a cardiologist who dropped out of the network, a prior-authorization rule that will delay your next MRI by a week, or a supplemental dental benefit that now caps out at $500 instead of $2,000.

The ANOC is the single most important piece of Medicare mail you get all year. It is legally required to be delivered by September 30, it is written specifically to compare 2026 versus 2027 side by side, and it is timed to reach you two to four weeks before the Annual Enrollment Period opens on October 15. Read it well and you have every fact you need to decide whether to stay put, switch Medicare Advantage plans, switch Part D plans, or drop back to Original Medicare plus Medigap. Below is the 8-section read-through that takes about 30 minutes and covers everything that matters — plus what changes on January 1, 2027 regardless of which plan you are in, and where the free calculators fit in when you are running the total-cost comparison.

The Annual Notice of Change is the mandatory disclosure that every Medicare Advantage (Part C) plan and every standalone Part D prescription drug plan sends its enrolled members each year. It documents, section by section, every material way the 2027 version of the plan differs from the 2026 version — costs, benefits, formulary, network, and rules. CMS regulates the format so all ANOCs cover the same ground in roughly the same order, which makes side-by-side comparison across plans possible.

Three quick clarifications:

• You only get an ANOC if you are in a Medicare Advantage plan or a standalone Part D plan. If you have Original Medicare with no drug plan and no Medigap changes to disclose, you don't get one. Medigap policies are guaranteed renewable and typically send a separate premium-only notice.
• The ANOC is not the same as the Evidence of Coverage. The EOC is the full contract — often 200 pages. The ANOC is the diff. Read the ANOC first; only open the EOC to check the fine print on something the ANOC changed.
• The ANOC is not a marketing document. Plans cannot use the ANOC to steer you toward optional add-ons or upsells. If your envelope contains glossy brochures, those are separate marketing pieces — not part of the required ANOC.

Every ANOC is organized around the same core disclosures. Work through them in this order, jotting down the delta between 2026 and 2027 for each. If none of the eight moves against you materially, staying is almost always the right call — switching plans has real friction (network reset, deductible reset, new pharmacy relationships). If two or more move against you, run the numbers on alternative plans before deciding.

Section 1: Monthly Premium

Look for the "Monthly Plan Premium" table. Note whether it went up, down, or held. In 2026 the average Medicare Advantage premium is around $17 per month; a $3–$8 increase is common and rarely by itself a reason to switch. A $20+ swing is worth attention, but only in the context of total cost — a small premium hike often accompanies benefit richness that saves you more elsewhere.

Section 2: Annual Deductible (Medical + Prescription Drug)

Two deductibles typically live here: the medical deductible (many MA plans still have $0) and the Part D drug deductible. In 2027 the maximum allowable Part D deductible is inflation-adjusted from 2026 under the IRA formula; many plans set theirs at the ceiling. A deductible going from $0 to a full ceiling can be substantial for someone who fills brand-name drugs early in the year.

Section 3: Copays and Coinsurance for Common Services

The ANOC lists cost-sharing for the services people actually use: primary care visits, specialist visits, urgent care, ER, ambulance, mental health outpatient visits, inpatient hospital days, outpatient surgery, home health, DME, and lab work. Compare each line 2026 vs. 2027. Small increases across many lines add up — model it against how many visits and services you actually used last year (your EOB history in the plan portal will tell you).

Section 4: Maximum Out-of-Pocket (MOOP)

Every MA plan has an annual medical MOOP — the ceiling on what you pay for Part A and Part B services in-network. CMS sets a federal maximum ($9,350 in 2026 for in-network); plans often set theirs lower to compete. If the MOOP jumps materially — say, from $5,500 to $7,900 — a bad medical year will cost you thousands more. Note that Part D has a separate out-of-pocket cap ($2,100 in 2026, inflation-adjusted for 2027 under the IRA) that is not part of the medical MOOP.

Section 5: Part D Formulary Changes

This is the section that most often justifies a switch. The ANOC lists:

• Drugs removed from the formulary (you either switch to an alternative or get an exception).
• Drugs added — helpful only if your doctor prescribed one.
• Drugs that moved tiers — generic to preferred brand, preferred brand to non-preferred brand, or brand to specialty. Tier moves change coinsurance sharply.
• Drugs newly subject to prior authorization, step therapy, or quantity limits.

Run every maintenance drug you take through this list. If one moved to Tier 4 or Tier 5, or picked up a step-therapy requirement, that alone can shift your best plan choice — even if everything else on the ANOC is fine.

Section 6: Provider and Pharmacy Network

The ANOC discloses "material" network changes — if a large health system exits, if a large chain pharmacy is no longer in the preferred cost-sharing tier, if the plan added or dropped SNF or home health partners. It does not list every individual doctor. To verify your specific providers, call each doctor's office in October and ask: "Are you a participating provider for [plan name] [contract number] for the 2027 plan year?" Do not accept "we take Medicare" — Medicare Advantage networks are contract-specific.

Section 7: Star Rating

CMS assigns 1 to 5 stars to every MA and Part D plan based on quality and member experience. The rating on your ANOC is the new one that takes effect for 2027 marketing. A drop from 4.5 to 3.5 stars is a meaningful quality signal — and if any plan in your area achieves 5 stars, you get a Special Enrollment Period to switch to it outside the normal AEP window.

Section 8: Supplemental Benefits (Dental, Vision, Hearing, OTC, Transportation, Fitness)

Medicare Advantage plans compete heavily on supplemental benefits — the "extras" Original Medicare doesn't cover. The ANOC discloses caps and covered services. A dental benefit shrinking from a $2,000 annual max to $500, or an OTC quarterly allowance dropping from $150 to $60, is a real dollar loss even if the premium didn't move. CMS has also tightened rules on some supplemental benefits for 2027 to require them be primarily health-related; expect some non-medical extras to disappear or shrink.

Two large federal changes touch every Medicare beneficiary in 2027 — and your ANOC should reflect them, but it helps to know they are happening so you can spot them.

Round 2 of IRA Drug Price Negotiation Takes Effect

The Inflation Reduction Act's second round of Medicare drug price negotiation applies negotiated Maximum Fair Prices (MFPs) to 15 more drugs starting January 1, 2027. The 2027 round is larger and broader than 2026's first round in two ways: it covers 15 drugs instead of 10, and it includes Part B (physician-administered) drugs for the first time, not only Part D pharmacy drugs. CMS has projected discounts of up to 85% off list price for some of the selected drugs and estimated hundreds of millions in aggregate member out-of-pocket savings. If any of the 2027 selected drugs is on your regimen — the list includes Ozempic and Wegovy, several oncology drugs, and other high-cost specialty medications — your ANOC's drug cost tables should show sharply lower cost-sharing for those specific NDCs.

Part D $2,000 OOP Cap, Inflation-Adjusted

The IRA's Part D catastrophic phase and the annual out-of-pocket cap (set at $2,100 for 2026) are indexed to inflation for 2027. Whatever the exact number, the cap continues to protect you from unlimited drug cost exposure — and the Medicare Prescription Payment Plan (M3P) is still available if you want to spread your capped out-of-pocket across the calendar year in equal monthly payments instead of paying it up front.

Part D Base Beneficiary Premium and Bid Stabilization

CMS's Part D bid stabilization program continues into 2027, dampening the year-over-year premium swings that would otherwise come from the IRA's redesign. Expect Part D premiums to move modestly rather than dramatically in your ANOC; if your plan's premium changed sharply, it is more often driven by plan-specific bid strategy than by broad program dynamics.

Set a timer. Get a notebook and a highlighter. This is the workflow that consistently catches the material changes.

1. Skim the cover letter (5 min). It usually has a summary of key changes. Ignore the marketing tone; treat it as a table of contents.
2. Highlight the eight sections above in the body of the ANOC (5 min). Every ANOC uses different headings; the substance is always there.
3. Write your 2026 → 2027 delta for each of the eight sections (10 min). One line per section: "Premium: $18 → $24. Deductible: $0 → $200. PCP copay: $0 → $10. MOOP: $5,500 → $6,900. Drug tier changes: rosuvastatin same, metoprolol same, semaglutide moved from Tier 3 to Tier 5. Network: no material change. Star rating: 4.5 → 4. Dental cap: $2,000 → $1,200."
4. Estimate 2027 total cost at current usage (5 min). Premium × 12 + expected drug costs at new tiers + expected medical cost-sharing + value of lost supplemental benefits.
5. Compare against two or three alternative plans on Medicare.gov Plan Finder (5 min). Enter your medications and pharmacy; Plan Finder runs the same total-cost math across every plan available in your ZIP. Add any plan whose annual total is 10%+ lower than your renewed 2027 plan to your shortlist.

If the shortlist has one or two candidates that beat your 2027 renewal and cover your providers, that is the switch-or-stay decision made with numbers. Call the winners in October, confirm your prescribers and hospital are in-network for 2027, and enroll during AEP (October 15 – December 7). Any change takes effect January 1, 2027.

A few patterns that trip people up when the 2027 ANOC arrives:

• "Non-renewing" language buried in the letter. If your plan is exiting your service area or terminating its Medicare contract, the ANOC will say so — but often only in a paragraph on page 2 or 3. If you see "Your plan is non-renewing for 2027," you have a guaranteed-issue right into Medigap in some states and a Special Enrollment Period through February 28, 2027 to pick a new MA or Part D plan. Do not delay.
• Formulary "with restrictions" is not the same as "on the formulary." A drug listed as covered but marked PA, ST, or QL means prior authorization, step therapy, or quantity limits apply. Effectively, you can't just refill; the prescriber has to justify it. Treat new restrictions on a maintenance drug the same as a tier increase.
• Preferred pharmacy shifts. Many Part D and MA-PD plans have a preferred pharmacy tier (usually one or two national chains) with lower cost-sharing. If your pharmacy dropped out of the preferred tier for 2027, your out-of-pocket on the same drugs at the same pharmacy will rise — often by 30–50% — without any formulary change.
• "Enhanced" benefits that require an add-on. Some plans market dental, vision, or hearing "enhancements" that require a separate optional supplemental benefit with an added monthly cost. The ANOC should disclose this; if it doesn't, ask.
• Ignoring the ANOC because "I like my plan." The plan you like today is not the plan you will have on January 1. Formulary and network changes are exactly what the ANOC discloses, and they happen every year to nearly every plan.

Once you've highlighted the deltas, run the total-cost math with your specific drug list and expected medical usage. Three free calculators help:

• Use the Drug Cost Finder to price every maintenance medication at your current pharmacy — and at nearby preferred pharmacies — so you can see the true cost impact of tier or preferred-pharmacy changes.
• Model your annual out-of-pocket exposure with the Plan Cost Calculator — plug in the new premium, deductible, expected drug costs, and expected medical services. It returns the annual total in seconds so you can compare against alternatives.
• If you want to see what Original Medicare with a Medigap policy would cost by contrast (useful if your 2027 ANOC shows meaningful degradation on network, formulary, or MOOP), run the Medicare Calculator to compare Original Medicare + Medigap + Part D against staying in Medicare Advantage.

The ANOC is the single document that turns Medicare enrollment from a guess into a decision. Every 2027 Annual Notice of Change must be delivered by September 30, 2026 and covers eight sections that decide whether staying in your current plan or switching during the October 15 – December 7 Annual Enrollment Period saves you more. The winning read-through takes 30 minutes: skim the letter, highlight the eight sections, write the 2026 → 2027 delta on each, compute total annual cost, and run two or three alternative plans through Plan Finder. If no section moves materially against you, stay. If two or more do — particularly a drug tier hike, a network exit, or a MOOP jump — the switch is usually worth the friction.

Two federal changes touch every plan on January 1, 2027 no matter what: the second round of IRA drug price negotiation cuts prices on 15 more Part B and Part D drugs by up to 85% off list, and the Part D OOP cap continues (inflation-adjusted from the 2026 $2,100 level). Both should show up in your ANOC drug cost tables — if a selected drug is on your regimen and your ANOC doesn't reflect a sharp cost-sharing drop for it, call the plan and ask why.