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Medicare guide · Part C · 11 min read

Medicare Advantage plan types — HMO, PPO, PFFS, SNP, MSA.

Medigap plans (F, G, N, K, L) are federally standardized — same coverage, every carrier. Medicare Advantage is the opposite. Each MA plan has its own network, formulary, prior-auth rules, and cost structure. The first thing to understand is the type. Pick the wrong type for your situation and the $0 monthly premium isn't a bargain — it's expensive.

HMO — Health Maintenance Organization

Most common

The default MA plan type. Lowest premium, tightest network.

Characteristics
  • ·Must use in-network providers (no coverage out-of-network except emergencies)
  • ·Required to choose a primary care physician (PCP)
  • ·Need referrals to see specialists
  • ·Prior authorization commonly required
  • ·Usually $0 monthly premium
  • ·Lowest typical out-of-pocket maximum (~$4,000-$6,000)
Good fit if
  • You're healthy and use minimal medical care
  • You have a strong PCP who manages your care
  • Your doctors and hospitals are confirmed in-network
  • You don't travel much
Bad fit if
  • You see specialists frequently
  • You travel often or split time between states
  • You need flexibility to switch doctors
  • You're managing a chronic condition with multiple specialists

PPO — Preferred Provider Organization

More flexibility

Like an HMO but with out-of-network coverage at a higher cost share.

Characteristics
  • ·In-network costs lower; out-of-network costs higher but covered
  • ·No PCP required (in most plans)
  • ·Specialists usually accessible without referral
  • ·Prior authorization still common
  • ·Premium typically $20-$80/mo (some still $0)
  • ·Two OOP maximums: in-network (~$5,000-$8,000) and combined ($8,000-$13,000)
Good fit if
  • You see specialists or use providers outside a tight network
  • You travel and need coverage in multiple states
  • You want network flexibility without leaving MA
  • You're snowbird-light (mostly in service area, occasional travel)
Bad fit if
  • Out-of-network costs can stack quickly if used regularly
  • Premium higher than HMO — only worth it if you'll use the flexibility
  • Still has prior auth — not a free-pass

PFFS — Private Fee-For-Service

Niche

The 'pay any provider that accepts the plan's terms' type. Becoming rare.

Characteristics
  • ·Provider must accept the plan's payment terms each visit
  • ·No formal network in most cases
  • ·Monthly premium varies; often comparable to PPO
  • ·Less common in 2026 — many carriers have exited the PFFS market
Good fit if
  • You live in a rural area with thin HMO/PPO networks
  • You travel extensively within the U.S.
  • Your providers will accept PFFS terms (verify before enrolling)
Bad fit if
  • Many providers don't accept PFFS — verify in advance for every doctor
  • Each visit can be a coverage roll of the dice
  • Plan availability is shrinking; you may be left without options

SNP — Special Needs Plan

Eligibility-restricted

MA plans tailored to specific populations. Three subtypes: D-SNP, C-SNP, I-SNP.

Characteristics
  • ·D-SNP: dual-eligible Medicare + Medicaid beneficiaries
  • ·C-SNP: people with specific chronic conditions (diabetes, COPD, ESRD, etc.)
  • ·I-SNP: people living in nursing homes or other institutional settings
  • ·Care coordination model — typically richer than standard HMO/PPO
  • ·Usually $0 premium for D-SNP
  • ·Eligibility verified — you can't enroll without qualifying
Good fit if
  • You're dual-eligible (Medicare + Medicaid) — D-SNP is almost always right
  • You have a qualifying chronic condition with high utilization
  • You live in or are entering long-term care
Bad fit if
  • If you don't qualify, you can't enroll
  • If your eligibility lapses (Medicaid expires, condition resolves), you may need to switch plans mid-year
  • Tighter coordination model can feel restrictive if you're medically stable

MSA — Medical Savings Account

Rare

High-deductible MA plan paired with a Medicare-funded savings account. Almost nobody picks this.

Characteristics
  • ·High annual deductible (often $5,000+)
  • ·Plan pays a deposit into your MSA each year
  • ·You spend the MSA money before the deductible kicks in
  • ·Doesn't include Part D — must enroll in standalone Part D separately
  • ·Available in very few service areas
Good fit if
  • You're disciplined about saving and want flexibility on how you spend
  • You have minimal expected medical needs
  • You want unspent MSA dollars to roll over year to year
Bad fit if
  • Almost everyone is better served by HMO or PPO
  • If you have any significant medical needs, the deductible eats you alive
  • Plan availability is scarce; you may not even have an option

Quick decision framework

  1. Are you dual-eligible (Medicare + Medicaid)? D-SNP is almost always the right answer.
  2. Do you have a serious chronic condition? Check if a C-SNP for that condition is available in your area.
  3. Do you travel or split time between states? Lean PPO. Or consider Original Medicare + Medigap (which has no network restrictions at all).
  4. Do you see specialists regularly? Lean PPO. Or Original + Medigap if you can afford the higher premium — no prior auth, broader provider acceptance.
  5. Are you healthy with minimal expected use? HMO is the cheapest path if your providers are in-network and you don't mind the PCP/referral structure.
  6. None of the above? Run our comparison tool — it ranks every MA-PD plan in your county against Original + Medigap by total expected cost.

Why Medigap (F/G/N/K/L) is structurally simpler than Part C

Medigap plan letters are federally standardized — every Plan G covers the exact same things from every carrier. You compare Plan G across carriers on price alone, because coverage is identical.

Part C (Medicare Advantage) is the opposite. Each MA plan defines its own network, formulary, prior-auth rules, copay structure, and supplemental benefits. You can't compare two MA plans on price alone — you have to compare on at least 6 dimensions: premium, OOP max, network, prior auth frequency, drug formulary fit for YOUR meds, and extras (dental/vision/ hearing). That's why our comparison tool exists — running this evaluation by hand for every MA plan in your county is impractical.

Browse Part C plans in your area — free

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Type your zip, see every MA plan available in your county with premium, OOP max, star rating, plan type, and drug coverage flag. No payment, no email gate.

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Sources
· CMS — Medicare Managed Care Manual, Chapter 16-A (MA plan types)
· Medicare.gov — Types of Medicare Advantage Plans
· KFF — 2025 Medicare Advantage Enrollment by Plan Type
· Commonwealth Fund — 2025 State Medicare Scorecard, prior auth by plan type