Health insurance for a large company with 250+ employees

Finding the right health insurance for a large company with 250+ employees isn't straightforward. You're balancing employee needs, budget constraints, and decisions about funding structures, underwriting options, and cover levels that smaller businesses don't face.

Standard business health insurance policies are designed for small and medium-sized companies. Once you're covering 250 or more employees, you enter corporate territory, where the rules, pricing structures, and available options change significantly.

The scale advantage

Large companies benefit from economies of scale that smaller businesses can't access. When you're insuring hundreds or thousands of employees, insurers view your workforce as a predictable risk pool rather than a collection of individual unknowns.

This predictability opens doors to pricing structures, underwriting options, and funding mechanisms that don't make sense for smaller groups. Your claims experience becomes statistically meaningful, allowing more accurate pricing and, in many cases, lower costs per employee than smaller businesses pay. Corporate health insurance also offers several features exclusive to large employers, from underwriting that covers pre-existing conditions to fully self-funded trusts.

Why this matters strategically

For large companies, health insurance isn't just an add-on benefit. It's a strategic tool that affects recruitment, retention, productivity, and workplace culture.

According to the Independent Healthcare Providers Network, over half of job seekers say they'd be more likely to apply for a role offering private medical insurance. In competitive talent markets, comprehensive healthcare distinguishes you from employers offering only basic benefits packages.

Beyond recruitment, healthy employees are productive employees. Access to fast diagnosis and treatment means shorter absences when health issues arise, and mental health support, increasingly standard in corporate schemes, addresses one of the biggest causes of workplace absence.

Large companies have more options than simply choosing between well-known insurance brands. Understanding the different structures available helps you choose the approach that best fits your organisation's risk appetite and budget.

Traditional private medical insurance (PMI)

The most straightforward option. You pay premiums to an insurer who takes on the risk of covering your employees' healthcare costs. If claims exceed expectations, the insurer absorbs the loss; if claims are low, the insurer keeps the surplus.

Your company pays a monthly or annual premium based on workforce size, demographics, selected benefits, and claims history. Employees access private healthcare through the insurer's network when they need treatment, and the insurer handles all claims administration and provider relationships.

Traditional PMI tends to suit companies that want simple, predictable budgeting, don't have the resources to manage healthcare administration in-house, or have volatile and unpredictable claims patterns.

Healthcare trusts (self-funded)

Instead of paying premiums to an insurer, you place funds into an HMRC-approved trust that pays claims directly, with a specialist administrator managing day-to-day operations. Stop-loss insurance can cap your exposure if claims run higher than expected.

Healthcare trusts avoid the Insurance Premium Tax that applies to traditional insurance premiums, and any surplus at year-end stays in the trust rather than going to an insurer. They tend to suit companies with 500+ employees, though some providers offer trusts from 250+, with reasonably stable claims experience. We cover healthcare trusts in more detail further down this guide.

Corporate deductible schemes

A hybrid between traditional insurance and full self-funding. You agree to cover claims up to a certain level, the deductible, after which insurance kicks in. You still avoid Insurance Premium Tax on the self-funded portion and benefit from surplus retention, without taking on unlimited risk.

This structure suits companies that want some of the benefits of self-funding without full risk exposure, or that are testing the waters before moving to a full healthcare trust.

Group personal medical insurance

Less common for very large employers. Each employee holds an individual policy, but they're administered as a group for pricing and management purposes.

This is rarely used for companies with 250+ employees, as traditional corporate schemes offer better value at scale, but it can suit specific circumstances such as covering overseas employees or providing portable benefits.

Understanding what's included, and excluded, helps you design a scheme that genuinely serves your employees' needs without paying for benefits that go unused.

Standard cover

• Inpatient and day-patient treatment - covers hospital stays, surgery, and procedures requiring at least a day in hospital, enabling employees to skip NHS waiting lists
• Cancer care - chemotherapy, radiotherapy, surgery, and specialist oncologists, usually without time or cost limits
• Diagnostic tests and scans - MRI, CT, PET scans, and other diagnostics for faster diagnosis
• Consultant appointments - access to private specialists without lengthy NHS referral waits
• Virtual GP services - 24/7 video consultations for advice, prescriptions, and referrals outside normal surgery hours

Enhanced cover options

• Full outpatient cover - extends beyond inpatient treatment to consultations, tests, and procedures that don't require hospital admission
• Mental health support - psychiatric consultations, therapy, counselling, and inpatient mental health treatment, with limits varying significantly between insurers
• Physiotherapy and therapies - osteopathy, chiropractic treatment, and physiotherapy, particularly valuable for active or desk-based workforces
• Dental and optical - usually added as separate benefits or cash plan elements, covering routine rather than major treatment
• Health screenings and assessments - comprehensive health checks, often tiered by seniority, to identify issues early

What's typically excluded

• Chronic conditions - long-term conditions like diabetes, asthma, or chronic heart disease aren't covered for ongoing management, though initial diagnosis and acute episodes may be
• Pre-existing conditions - under standard underwriting, conditions employees had before joining the scheme aren't covered. Medical history disregarded underwriting removes this limitation
• Cosmetic procedures - not covered unless medically necessary
• Pregnancy and fertility - routine pregnancy isn't covered, though complications may be, and some schemes offer fertility treatment as an optional extra
• GP services - general practice consultations aren't covered, as employees access these through the NHS. Virtual GP is included for convenience rather than as a replacement

The UK corporate health insurance market is dominated by a handful of major insurers, each with distinct strengths. Understanding these helps you shortlist appropriate providers before comparing detailed quotes.

Bupa

One of the most recognisable names in UK health insurance, Bupa serves tens of thousands of employers, with its Corporate Select product designed specifically for companies with 250+ employees.

Strengths include strong brand recognition among employees, comprehensive mental health cover, and an extensive hospital network across the UK. Premium pricing compared to some competitors means brand recognition alone shouldn't be the deciding factor.

AXA Health

AXA has provided healthcare services in the UK since 1940, making it one of the most experienced providers, known for flexible, modular policies that allow extensive customisation.

Strengths include flexible benefit design, strong outpatient cover options, a 24/7 virtual GP service, and access to a wide network of private hospitals. The range of options can make comparison more complex, and it isn't always the cheapest choice.

Vitality

Distinctive for its wellness-focused approach that rewards healthy behaviour, Vitality's corporate product combines health insurance with its Vitality programme.

The wellness programme encourages employee engagement with their own health, alongside strong mental health support and popular rewards such as gym discounts. Benefits depend on employees actively engaging with the programme, and it has received mixed customer satisfaction scores in some surveys.

Aviva

One of the UK's largest insurers, Aviva offers straightforward corporate health insurance with competitive pricing and solid coverage.

Strengths include competitive pricing, clear product design, good digital tools, and strong cancer care cover. Some customer reviews mention claims handling could improve, and outpatient mental health typically requires an add-on.

WPA

A not-for-profit insurer dating back to 1901, WPA specialises in bespoke healthcare solutions for large companies, including healthcare trusts.

Strengths include healthcare trust expertise, a not-for-profit ethos, and a corporate deductible hybrid option. It has less brand recognition than major competitors and may suit companies with more complex requirements better than those wanting a straightforward off-the-shelf policy.

Comparing providers

No single provider is right for every large company. The best choice depends on your budget, your workforce's age profile and health needs, the specific benefits you prioritise, your administrative preferences around digital tools and account management, and any existing relationships or switching costs. Working with a specialist broker allows you to compare across all major providers without gathering individual quotes yourself.

Understanding what drives costs helps you make informed decisions about scheme design and budget allocation. Corporate health insurance for large companies typically costs between £30-100+ per employee per month, though the exact figure depends on several variables.

For a company with 500 employees, that translates to a wide range of possible annual costs depending on the cover level chosen, from broadly £180,000 at the basic end to £720,000+ for comprehensive cover. Speak to an advisor for an estimate based on your own workforce.

What affects your premium

• Workforce age profile - age is the single biggest factor in pricing; older employees statistically make more, and costlier, claims
• Geographic location - London and the South East have higher medical costs, particularly where premium hospital lists are used
• Claims history - previous claims experience heavily influences renewal pricing
• Cover level selected - more comprehensive benefits mean higher premiums, but better protection
• Excess levels - higher excess reduces premiums; common levels range from £0-500 per person per year
• Hospital network - access to premium hospitals, particularly in Central London, costs more than guided or limited networks
• Underwriting type - medical history disregarded underwriting costs more than moratorium underwriting because it covers pre-existing conditions, though the extra cost is often modest once spread across a large group

Managing costs effectively

• Choose appropriate excess levels - a modest excess per person annually can meaningfully reduce premiums without making the scheme unaffordable for employees
• Consider six-week wait options - some policies only cover treatment if the NHS wait exceeds six weeks, which can reduce premiums while still providing the core benefit of avoiding long waits
• Review hospital networks - unless you specifically need premium London hospitals, standard or guided networks offer quality care at lower cost
• Focus on high-value benefits - inpatient treatment, cancer care, and diagnostics deliver the most value; weigh whether expensive add-ons justify their cost for your workforce
• Consider a healthcare trust - for larger workforces, self-funding can reduce costs compared to traditional PMI through tax savings and surplus retention
• Work with a broker - specialist brokers understand which insurers suit specific industries and demographics, and can support renewal negotiations

Underwriting determines which conditions are covered and how pricing reflects your workforce's health. Large companies have access to underwriting options that smaller businesses can't use.

Medical history disregarded (MHD)

The gold standard for corporate health insurance. MHD covers all employees regardless of medical history, with pre-existing conditions covered from day one.

The insurer accepts all employees without health questions, so everyone gets the same coverage regardless of their medical history or current health status. This removes the anxiety of employees wondering if their existing health issues will be covered, and avoids complex health declarations.

MHD typically requires 250+ employees, though some insurers offer it from smaller groups or require 500+. It costs more than other underwriting types because it covers more risk, but for large groups the additional cost is often modest once spread across many employees.

Moratorium underwriting

The most common underwriting type for smaller schemes, sometimes used for larger groups seeking lower premiums.

Conditions employees have had symptoms of, received treatment for, or taken medication for in the five years before joining aren't covered initially. After two consecutive years without symptoms or treatment, the condition becomes covered.

This keeps initial premiums lower with no medical questions required at application, but it creates uncertainty for employees with existing conditions and can lead to claim disputes and administrative complexity tracking which conditions are covered for which employees.

Full medical underwriting (FMU)

Requires detailed health declarations from employees, with specific exclusions applied based on their medical history. Someone with previous back problems might have back conditions excluded; someone else might have no exclusions at all.

This makes clear from day one what's covered and can be cheaper than MHD for a healthy workforce, with no moratorium waiting period. The trade-off is the administrative burden of collecting declarations, the need for employees to disclose medical history, and the risk that some employees end up with significant exclusions.

Our recommendation

For most large companies, MHD underwriting is worth the additional cost. It removes uncertainty, ensures every employee gets the same valuable benefit, and cuts administrative complexity. The premium difference is typically modest when spread across hundreds of employees.

For companies with 500+ employees, though some providers offer options from 250+, healthcare trusts provide an alternative to traditional PMI that can offer cost savings, flexibility, and control.

How healthcare trusts work

1. Trust establishment - set up an HMRC-approved trust, a legal entity that holds funds for employee healthcare
2. Funding - contribute to the trust based on expected claims plus a margin for contingency, similar to what you'd pay in insurance premiums but held in your own trust
3. Administration - a specialist administrator manages day-to-day operations, including claims processing, customer service, and provider relationships
4. Claims payment - when employees need treatment, claims are paid directly from the trust fund
5. Stop-loss protection - you can buy insurance that kicks in if claims exceed a certain level, limiting your risk exposure

Why large companies choose trusts

Trust contributions aren't subject to the Insurance Premium Tax that applies to traditional insurance premiums, which can save a large scheme a meaningful amount each year. For a scheme costing £500,000 annually, that's potentially £60,000 saved through the tax difference alone. If claims come in lower than funded, the surplus stays in your trust for future years rather than going to an insurer.

You also get full transparency over where money goes, with claims data available for your own workforce health planning, and complete flexibility to design benefits exactly as you want them rather than being constrained by off-the-shelf policy structures. Combining tax savings, surplus retention, and efficient administration, well-run trusts typically cost around 10% less than an equivalent insured arrangement.

When trusts make sense

• You have 500+ employees, or 250+ with a provider that supports smaller trusts
• Your claims experience is relatively stable and predictable
• You want maximum control over scheme design
• You have capacity to manage the administrative relationship
• Your risk tolerance allows for some claims variability

When traditional insurance may be better

• Smaller employee numbers where predictability is lower
• Highly volatile claims history
• A preference for simplicity and fixed budgeting
• Limited internal resources for scheme oversight

Setting up corporate health insurance involves more steps than an individual policy. Understanding the process helps you plan a realistic timeline, typically 6-10 weeks from initial enquiry to your scheme going live.

A well-designed corporate health scheme delivers real value for recruitment, retention, and productivity. These are the mistakes that most commonly get in the way.

Full corporate PMI isn't the only way to support employee health. These alternatives can complement or substitute for traditional cover depending on your budget and objectives.