ONVZ vs Aetna International: Health Insurance for Expats in the Netherlands (2026)

A few years ago a colleague of mine — a senior software engineer who had relocated from Singapore to Amsterdam on a three-year corporate assignment — called me in something close to panic. She had been in the Netherlands for six months, had dutifully kept her Aetna International policy from her previous posting in London, and had just received a letter from the Belastingdienst informing her that she owed nearly EUR 2,000 in fines for failing to take out Dutch health insurance. She had assumed, reasonably enough, that her existing international plan would simply carry over. It did not.

The Dutch health insurance system has some specific rules about who must be in it — and those rules apply to most expats, regardless of what coverage they already have. Understanding whether you need Dutch insurance, international insurance, or potentially both, is the most important question to resolve before comparing any specific plans.

This article compares ONVZ and Aetna International in detail: what they cover, what they cost, where each one works better, and — critically — who actually qualifies to use each. I will be direct where one is meaningfully better than the other and honest where the choice genuinely depends on your individual situation.

If you want to start with a broader overview of how Dutch health insurance works for expats, read the complete expat health insurance guide first. If you already know the basics and want a personalised match, the Health Insurance Wizard tool will ask a few targeted questions and point you in the right direction.

The Critical First Question: Do You Need Dutch Health Insurance?

Before comparing ONVZ and Aetna, you must answer this. It shapes everything.

Who MUST have Dutch basisverzekering

You are legally required to have Dutch basic health insurance (basisverzekering) if you:

• Live and work in the Netherlands as an employee paying Dutch social insurance contributions
• Are self-employed (ZZP) and based in the Netherlands
• Are a resident with income from the Netherlands (including freelancers, contractors, and those on orientation year visas working here)
• Are a family member of someone in the above categories who is registered at a Dutch address

The basisverzekering is not optional for this group. An international plan from Aetna, Cigna, Allianz Care, or anyone else does not count as a legal substitute. If you fail to take out Dutch insurance when required, you will be assigned a policy by the CAK (the central administrative office) — at a higher premium — and back-charged, possibly with a fine.

Who MAY be exempt from Dutch basic insurance

You may be able to use an international plan as your primary insurance if you:

• Are posted to the Netherlands by a foreign employer and hold an A1 certificate (EU/EEA) or certificate of coverage (non-EU) confirming you remain in your home country’s social security system
• Work for an international organisation with diplomatic status (UN bodies, NATO, EU institutions, consular staff)
• Are on a specific highly paid knowledge migrant (kennismigrant) arrangement where your employer has a bilateral exemption — this is rare and must be formally confirmed
• Are a student from an EU country with a valid European Health Insurance Card (EHIC) for temporary stays, though this is not a reliable long-term solution
• Receive a pension from abroad and are not working in the Netherlands — specific rules apply depending on tax treaty arrangements

If you fall into the exempt category, you genuinely have a choice between ONVZ’s international plans, Aetna International, or a comparable global insurer. The comparison below is most directly relevant to you.

If you are not sure which category you fall into, the SVB (Sociale Verzekeringsbank) has an online check tool. Do not guess — the consequences of getting this wrong, as my colleague discovered, are financially painful.

For more on handling Dutch administrative requirements after arrival, the expat insurance overview for the Netherlands covers the registration and exemption process in full.

Who Are ONVZ and Aetna International?

This distinction matters and is often confused in expat forums.

ONVZ is a Dutch health insurer, headquartered in Woerden, operating under Dutch law and supervised by the Dutch Financial Markets Authority (AFM) and the Dutch Healthcare Authority (NZa). They offer the standard Dutch basisverzekering for residents who must be in the Dutch system. They also offer international plans — ONVZ Vrij and ONVZ Expat — designed for people who are exempt from the Dutch system or who want top-up coverage beyond the basisverzekering. ONVZ positions itself as a premium, service-focused insurer within the Dutch market. They are not a global giant; their strength is deep integration with the Dutch healthcare system.

Aetna International is a division of CVS Health (one of the largest healthcare companies in the world) and operates as a global international private medical insurance (iPMI) provider. They are not a Dutch insurer. They do not offer Dutch basisverzekering. They design their plans for globally mobile employees, expatriates, and international organisations who need coverage that works across multiple countries, regardless of local insurance requirements. In the Netherlands, they are used primarily by corporate assignees who are formally exempt from Dutch social insurance, or by high-net-worth individuals who supplement their Dutch coverage with private international plans.

The core distinction: ONVZ is a Dutch insurer with international plan options. Aetna International is a global insurer that happens to cover the Netherlands among many countries. This shapes everything from how you access GPs to how claims are processed to whether your coverage follows you if you relocate again.

Comparison Table: ONVZ vs Aetna International (2026)

Premiums are indicative for 2026 and vary significantly by age, coverage tier, deductible, and geographic area selected.

Premium and Cost Comparison

Cost is usually the first question, so let me give you realistic numbers rather than marketing ranges.

ONVZ International Plan Premiums

ONVZ offers two main international-oriented products relevant to expats who are exempt from the Dutch system:

ONVZ Vrij: Their premium restitutie-style plan, allowing choice of any Dutch provider. When used as an international plan (by those exempt from basisverzekering), it provides broad coverage for care in the Netherlands and emergency cover abroad. Monthly premiums in 2026 run approximately:

• Age 25-35: EUR 145-165/month
• Age 36-45: EUR 165-195/month
• Age 46-55: EUR 195-240/month
• Age 56-65: EUR 240-290/month

ONVZ Expat: Specifically marketed to international residents in the Netherlands who need coverage that integrates with Dutch care. Premiums are broadly comparable to ONVZ Vrij depending on coverage tier selected.

Both plans allow you to adjust the deductible (eigen risico equivalent) — increasing it reduces premiums meaningfully. Choosing a EUR 500 deductible versus EUR 0 can cut premiums by EUR 20-35/month.

Aetna International Plan Premiums

Aetna uses age bands and geographic zones. For someone based in the Netherlands (Western Europe zone), indicative 2026 premiums for their International Health Plan:

• Age 25-35: EUR 180-220/month (excluding USA coverage)
• Age 36-45: EUR 215-270/month
• Age 46-55: EUR 270-340/month
• Age 56-65: EUR 340-420/month+

Adding USA coverage increases premiums by 30-60% depending on the tier. If you have no need to access healthcare in the United States, excluding it brings costs down substantially.

Aetna also offers a deductible structure: choosing a higher annual deductible (e.g. USD 1,000 or USD 2,500) reduces monthly premiums significantly, which can make Aetna competitive with ONVZ for those who are primarily insuring against large, unexpected costs.

Bottom line on cost: For equivalent coverage within the Netherlands and Europe, ONVZ is generally cheaper. Aetna’s premium reflects its global infrastructure, English-first service model, and genuine worldwide portability. You pay for what you get.

Coverage: The Key Areas

GP Access

In the Dutch system, your huisarts (GP) is your gatekeeper. You register with a local practice, and virtually all specialist care requires a referral from your GP first. This is true whether you have a Dutch basisverzekering, an ONVZ plan, or an Aetna International plan — the GP referral requirement is a feature of Dutch healthcare organisation, not a policy choice by the insurer.

ONVZ: Because they are deeply integrated into the Dutch system, ONVZ works seamlessly with Dutch GP practices. Direct billing, no paperwork on routine visits, and ONVZ’s contracted network includes virtually all registered Dutch huisartsen.

Aetna International: Aetna’s global model is built around direct specialist access in many countries. In the Netherlands, however, you will still typically need to register with a huisarts and get a referral before seeing a specialist — Aetna’s plan documents may say direct access is permitted, but in practice Dutch clinics will ask for one. Aetna’s Dutch provider relationships are good for hospital and specialist care, but the GP layer is the same for everyone.

Specialist Access

Once you have a GP referral, both plans cover specialist consultations. The difference is in how they cover it.

ONVZ: Direct billing with contracted Dutch hospitals and specialists. For their international plans, they reimburse at the NZa tariff (the Dutch regulated rate) for most care. Coverage for care abroad (non-emergency) varies by plan tier.

Aetna International: Direct billing arrangements with major private clinics and hospitals in the Netherlands, including Bergman Clinics, MC Slotervaart (private wing), and several academic hospital private departments. For expats who want access to English-speaking private specialists without waiting lists, Aetna’s network is particularly relevant. Specialist care in other countries (if you are travelling or temporarily based abroad) is processed through the same policy without needing to change anything.

Dental

Neither ONVZ international plans nor Aetna International include unlimited dental as standard. Both offer dental as part of tiered coverage.

ONVZ dental (international plans):

• Basic tier: check-ups and basic restorations up to EUR 500/year
• Higher tiers: crowns, bridges, major restorations up to EUR 1,500-2,500/year
• Orthodontics available at premium tiers
• Waiting period of 3-6 months typically applies

Aetna International dental:

• Included in their standard International Health Plan at a defined level (routine and major dental)
• Annual maximum typically USD 1,000-1,500 at base tier; higher tiers go to USD 3,000+
• Orthodontics covered with sub-limit (typically USD 1,500 lifetime)
• Waiting periods apply for major restorative work

Aetna’s dental integration is slightly smoother for expats who travel frequently — you can use their dental network in multiple countries on the same policy. ONVZ’s dental works best when you are primarily based in the Netherlands and using Dutch dentists.

Mental Health

Mental health coverage is an area both plans handle, but with real-world limitations.

ONVZ international plans: Cover for psychological care and psychiatric treatment, typically with annual session limits (e.g. 40-60 sessions) and some sub-limits on treatment types. Integration with Dutch GGZ providers is available, which matters because GGZ waiting lists in the Netherlands are long — having an ONVZ plan does not automatically get you a faster appointment, but their contracted network is wide.

Aetna International: Mental health and substance use disorders are covered within their plans. Aetna has worked to integrate mental health parity provisions. For expats who want access to private English-speaking therapists — which can be booked faster than going through the Dutch GGZ waiting list — Aetna’s direct billing with private psychological practices (some of which operate in English in Amsterdam, The Hague, and Rotterdam) is useful. Annual session limits apply.

Practical reality for expats: If you want quick access to English-speaking mental health support without a 6-month wait, neither ONVZ nor Aetna makes this automatic — you are looking at private practitioners who may or may not be in-network. Budget approximately EUR 80-130 per session for private English-speaking therapy in the Netherlands regardless of insurer.

Maternity Coverage

Maternity care is an important consideration for expats of childbearing age, and it works very differently in the Dutch system versus international insurance.

Dutch system (relevant for those on basisverzekering): Maternity care is covered in the basisverzekering. The Netherlands has a distinctive model with a strong preference for home birth supported by a midwife (verloskundige), with hospital birth covered when medically indicated. Kraamzorg (postpartum home care) is included in the basic package. GP visits during pregnancy are covered without hitting your eigen risico.

ONVZ international plans: Maternity is included but typically with a waiting period of 10-12 months from plan start. The Dutch midwife and kraamzorg model integrates well with ONVZ’s coverage.

Aetna International: Maternity is covered in their standard plans with a waiting period of 10-12 months. Aetna’s global network is particularly useful for expats who may not know yet which country they will give birth in — the coverage follows them. If you know you want to return home for the birth, Aetna’s portability is a meaningful advantage.

One important note: If you are registered in the Netherlands and required to have basisverzekering, your maternity care is covered by that. An international plan on top would be redundant for Dutch maternity specifically.

Repatriation

Repatriation — medical transport back to your home country if you become seriously ill or are injured — is included in both ONVZ’s international plans and Aetna International’s standard offering. The practical differences are worth knowing.

ONVZ: Repatriation is covered for medical necessity. Decisions are made by ONVZ’s medical team. For emergencies within the Netherlands, ONVZ’s Dutch infrastructure means they can coordinate efficiently with Dutch hospitals.

Aetna International: Aetna typically works with dedicated assistance companies (often via a 24/7 assistance line) who arrange medical evacuation and repatriation globally. Given their global scale, this infrastructure is more developed than ONVZ’s. For expats who live in countries with less developed emergency medical systems, Aetna’s repatriation capability is a genuine differentiator — but within the Netherlands, which has excellent emergency services, it matters less.

Claims Process and Customer Service

This is where the two insurers differ most tangibly day-to-day.

ONVZ customer service:

• Primarily Dutch-language service, with English available
• Customer service hours: standard Dutch business hours
• Claims portal available online; paper claims accepted
• For Dutch care, direct billing is common — you rarely submit a claim for GP or hospital visits
• Response times for written queries: typically 5-10 working days

Aetna International customer service:

• English-first, with multilingual support across many languages
• 24/7 assistance line for emergency situations
• Digital claims submission via Aetna’s member portal and mobile app
• Faster digital claims processing for pre-authorised treatments
• International account managers available for corporate policyholders

For expats who do not speak Dutch and want a smooth, English-language experience when something goes wrong at 11pm, Aetna’s 24/7 support is a real advantage. ONVZ’s service is good but it is fundamentally a Dutch-market product and operates like one.

Who Each Plan Is Best For

Choose ONVZ if:

• You are exempt from Dutch basisverzekering (posted worker with A1 certificate, international organisation employee) and want premium coverage that integrates deeply with Dutch healthcare
• You are primarily based in the Netherlands and travel occasionally rather than living a genuinely multi-country life
• You want Dutch hospital direct billing and easy access to the full range of contracted Dutch healthcare providers
• You prefer a Dutch-law regulated product with Dutch consumer protections and an NZa-supervised claims process
• Your budget is more constrained but you still want strong international-quality coverage
• You are comfortable dealing with a primarily Dutch-language insurer and have sufficient Dutch or are happy using translation tools

Choose Aetna International if:

• You are globally mobile — your expat assignment may move you from the Netherlands to another country, and you want uninterrupted continuity
• You are exempt from Dutch basisverzekering and want English-first service, 24/7 support, and a truly international network
• You frequently travel for work and need to access high-quality private care in multiple countries on the same policy
• Repatriation infrastructure matters — you want a dedicated global assistance team rather than a Dutch insurer’s more limited provision
• You want direct billing with English-speaking private clinics in the Netherlands without navigating Dutch administrative processes
• Your employer is covering the premium and offers Aetna as a corporate plan option — individual pricing is often less favourable, but corporate rates can be competitive

A note on combining both:

Some expats who are required to hold Dutch basisverzekering choose to add an international plan as supplementary coverage — particularly for dental, repatriation, access to private specialists, and worldwide coverage when travelling. ONVZ’s aanvullende verzekering (supplementary plans) can be added to any Dutch basisverzekering, including those from other insurers. Aetna International can also technically be used as a top-up, though this creates some complexity in coordinating claims between a Dutch insurer and an international one. For most people, a good Dutch basisverzekering with a well-chosen supplementary dental and physio add-on is sufficient — the Insurance Chooser tool can help you work out whether international top-up coverage genuinely adds value for your situation.

If you are comparing Dutch domestic insurers like Zilveren Kruis and CZ alongside ONVZ’s Dutch basisverzekering plans, the Zilveren Kruis vs CZ comparison gives you a direct side-by-side analysis of those two. For a broader overview of all expat insurance options in the Netherlands, read the expat insurance Netherlands guide.

Pros and Cons Summary

ONVZ International Plans

Pros:

• Strong integration with Dutch healthcare providers — the best of any international plan for Netherlands-based expats
• Dutch-law regulated, with NZa oversight and Dutch consumer protections
• Competitive premiums relative to global iPMI plans at equivalent coverage levels
• Works seamlessly within Dutch GP referral system
• Good supplementary plan options (dental, physio, alternative medicine) that layer well with Dutch care
• High coverage ceilings at premium tiers

Cons:

• Primarily designed for the Netherlands — coverage quality and network thins outside the country
• Dutch-language first; English service available but not primary
• No 24/7 global assistance line equivalent to large global insurers
• Not ideal for globally mobile professionals who may relocate again soon
• Customer service operates on Dutch business hours
• Repatriation infrastructure less developed than global specialists

Aetna International

Pros:

• Genuinely worldwide coverage — consistent across countries, including if you relocate
• English-first, 24/7 customer service and emergency assistance
• Strong digital claims process and member portal
• Direct billing with major private clinics internationally, including in the Netherlands
• Excellent for corporate assignees and highly mobile expats
• Mature repatriation and medical evacuation infrastructure
• Good maternity portability if birth country is uncertain

Cons:

• Higher premiums than ONVZ at equivalent coverage levels, especially for older expats
• Does not replace Dutch basisverzekering — cannot be used to satisfy the Dutch legal insurance requirement
• Integration with Dutch GP system is no better than standard; Dutch referral norms still apply
• Not Dutch-law regulated — disputes go through international arbitration rather than Dutch consumer bodies
• Can be complex and expensive for individuals without employer contribution

My Verdict

After ten years of helping expats sort out their insurance in the Netherlands, my honest assessment is this:

For most expats who are legally required to have Dutch basisverzekering, neither ONVZ’s international plans nor Aetna International is the right primary insurance. You need a Dutch basisverzekering — and ONVZ actually offers a strong one, with one of the best restitutie policies on the market if you want maximum provider flexibility.

If you need to find and compare Dutch basisverzekering options, Independer lets you compare all major Dutch insurers — premiums, coverage levels, and eigen risico options — in one place:

Compare Dutch Health Insurance on Independer →

For expats who are exempt from the Dutch system — posted workers, international organisation staff, short-term assignees — ONVZ’s international plans are the better choice if your life is primarily Netherlands-based. They give you outstanding Dutch healthcare access, Dutch consumer protections, and competitive premiums. The Dutch-language service is a real limitation, but not an insurmountable one.

Choose Aetna International if you are genuinely globally mobile. If your assignment might move you from Amsterdam to Singapore to Zurich over the next five years, or if your employer has a corporate Aetna arrangement, or if 24/7 English-language emergency support matters significantly to you, Aetna’s global infrastructure justifies the premium. You will pay more per month, but you will not be starting from scratch on insurance with every relocation.

The worst outcome I see repeatedly is expats defaulting to their existing international plan from a previous posting — often Aetna or Cigna — without checking whether they now need Dutch basisverzekering. The CAK can impose a fine of approximately EUR 469 for late registration, and continued non-compliance leads to enforced enrolment with back-billed premiums. Check your legal status first, then compare plans.

For a personalised recommendation based on your visa type, employer situation, and coverage priorities, the Health Insurance Wizard is the fastest way to get a clear answer without wading through all the policy documents yourself.

What about budget temporary coverage?

One question I get from expats who are between assignments, waiting for their Dutch registration to be processed, or taking a short working holiday before committing to the Dutch system: is there a cheaper option for temporary coverage?

For purely temporary or travel-based coverage — not as a replacement for Dutch basisverzekering, which remains legally mandatory once you are a resident — SafetyWing Nomad Insurance is worth knowing about. It is designed for digital nomads and internationally mobile people, and starts from around $45/month. It covers emergency medical care, hospitalisations, and evacuation, but it is explicitly travel insurance, not a regulated health plan. It does not satisfy the Dutch legal requirement to hold basisverzekering. Use it only for the gap period before you are legally required to enter the Dutch system, or as basic travel cover when you are temporarily outside the Netherlands.

Get SafetyWing temporary coverage from $45/month →

Related Guides

• Health Insurance for Expats in the Netherlands: The Complete Guide 2026
• Expat Insurance in the Netherlands: All Your Options 2026
• Zilveren Kruis vs CZ: Dutch Health Insurance Compared 2026
• Health Insurance Wizard — Get a Personalised Match
• Insurance Chooser Tool

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