Choose around your care, not just the plan’s initials.
A plan’s structure affects where you receive care, how you see specialists, and how prescriptions are covered. The exact plan and your location matter.
Your Medicare reading guide
Start with the basics, then explore decisions that affect your coverage and costs.
Medicare Advantage plan types at a glance
| Type | Doctors and hospitals | Primary care and referrals | Prescription coverage |
|---|---|---|---|
| HMO — Health Maintenance Organization | Usually network care; exceptions include emergencies, out-of-area urgent care and temporary out-of-area dialysis. | Usually a primary care doctor and specialist referrals. | Usually included; choose an HMO with Part D if you need it. |
| HMO-POS — HMO Point of Service | An HMO with some out-of-network benefits, commonly at higher cost. | Check which services need referrals and approval. | Check the specific HMO’s included drug benefit. |
| PPO — Preferred Provider Organization | Generally covers eligible out-of-network care, usually at higher cost. Confirm provider acceptance. | Generally no required primary doctor or specialist referrals. | Usually included; you generally cannot add a stand-alone drug plan. |
| PFFS — Private Fee-for-Service | Providers must accept Medicare and the plan’s payment terms. Some plans use networks. | No required primary doctor or specialist referrals. | May be included; a separate Part D plan is possible if it is not. |
| SNP — Special Needs Plan | An HMO or PPO designed for an eligible population, with care coordination. | Depends on whether the SNP is an HMO or PPO. | All SNPs include Part D. |
| MSA — Medical Savings Account plan | High-deductible Medicare Advantage coverage plus a plan-funded savings account. | Generally no network; check provider participation. | Not included; obtain a separate Part D plan if needed. |
HMO and HMO-POS: know the network rules
Routine care outside an HMO’s network may leave you responsible for the full bill. HMO-POS does not mean every out-of-network service is covered. Ask which services qualify and at what cost. An HMO usually coordinates specialist care through a primary care clinician; some services do not require referrals.
PPO: flexibility still comes with conditions
A PPO can be useful when you want out-of-network options, but it is not a promise that every doctor will treat you. Ask the provider and plan about acceptance and costs before scheduling. No specialist referral requirement does not mean no prior authorization: referral and approval are different steps.
PFFS: accepting Medicare alone is not enough
PFFS is Medicare Advantage, not Original Medicare or Medigap. For non-emergency care outside a contracted network, confirm before each service that the provider accepts the plan’s terms and agrees to treat you. A previous visit does not guarantee acceptance next time. Emergency treatment has separate protections.
Special Needs Plans: D-SNP, C-SNP and I-SNP
- D-SNP: for people with Medicare and qualifying Medicaid eligibility; eligibility levels and coordination differ by plan and state.
- C-SNP: for people with the particular qualifying chronic condition or conditions served by the plan. Not every diagnosis qualifies for every C-SNP.
- I-SNP: for people meeting specified institutional or equivalent care-needs criteria. Ask about the plan’s exact requirements.
You need Parts A and B, must live in the service area, and must meet the SNP’s eligibility rules. SNPs coordinate care; they do not eliminate network requirements. Read about Medicaid and Extra Help.
Medicare.gov: Special Needs Plans ↗
MSA: a different way to budget for care
Medicare deposits money through the plan into a savings account paired with a high-deductible plan. The deposit can be less than the deductible, leaving a gap you must plan for. This is different from a regular HSA you fund yourself. Eligibility restrictions apply, and availability varies.
Questions worth asking before you switch
- Does this exact plan include my doctor, hospital, specialist and pharmacy?
- How will it cover routine care where I spend part of the year?
- What approvals, referrals, copays and medical out-of-pocket limits apply?
- Are my medicines covered at their exact doses, and what is my estimated yearly cost?
- Which enrollment period permits this change, and when does it take effect?
A $0 plan premium does not mean $0 care, and you generally keep paying Part B. Do not add a stand-alone Part D plan to an HMO or PPO without checking: it generally disenrolls you from Medicare Advantage and returns you to Original Medicare. This differs from PFFS without drug coverage and MSA arrangements.
AEP, Medicare Advantage Open Enrollment and SEPs → · Referrals, prior authorization and hospital costs →
Reviewed October 17, 2026 against Medicare.gov’s plan-type guidance. General education; local availability, eligibility and plan documents control. LI4W is not affiliated with Medicare or a government agency.
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