A family policy is several contracts sharing an invoice
Buying cover for a household reads like a single purchase. It is not. Each person named on the policy is separately eligible or not, separately underwritten, separately subject to the limits, and separately capable of falling out of cover. The invoice is joint; almost nothing else is.
That matters because the failure modes are individual rather than collective. A child ages off. A newborn is added a week too late. One member moves to a country outside the area of cover. A deductible that looked affordable turns out to apply four times over. None of these is visible in a premium comparison, and all of them are settled in the wording.
What follows is the eligibility and scoping detail: who counts as a dependant, when they stop counting, how a baby joins, and whether the numbers on the benefit table belong to the family or to each person in it.
Who counts as a dependant, and when children age off
Every insurer defines a dependant, and the definitions do not agree. The usual shape is a spouse or partner plus children below a stated age, with an extension for children in continuous full-time education.
William Russell's plan agreement sets children at under 18, or under 25 if in continuous full-time education, with proof potentially required. A spouse or partner may be added later provided they are under 76 at their date of entry.
The NIMBL documents are a better illustration of why the brochure is not the contract. The policy wording puts dependant children at under 21 at commencement or renewal, or under 23 if demonstrably in full-time education during the period of insurance. The individual application form, from the same insurer and the same document set, says under 21, or under 25 if unmarried and in full-time education. Twenty-three and twenty-five are not the same year, and a family relying on the application form's figure would find the wording controls at claim time. When you are checking eligibility, check the policy wording, and treat the marketing material and application notes as a summary that may be wrong.
The mechanics of ageing off matter as much as the age. Cover does not usually stop on the birthday. William Russell's agreement removes eligibility from the renewal date following the qualifying event — turning 18, marrying, or turning 25 in full-time education. The child may take out an individual policy at adult rates if the application and premium reach the insurer within 30 days of that renewal date, with continuity preserved. Miss it, and cover ends at midnight the day before the renewal date and any later application is subject to fresh medical underwriting. A young adult who has developed any condition while on the family policy will meet that underwriting with a history, which is precisely the outcome the 30-day window exists to avoid. Anyone whose child is heading overseas to study should read that alongside international student health insurance, because the two decisions arrive in the same year.
Adding a newborn, and why the timing is not administrative
Adding a baby is the one place where a few days genuinely change what is covered, and insurers price the risk of selection against them accordingly.
William Russell will add a newborn without medical underwriting and backdate cover to the date of birth, provided the name and date of birth are notified and the additional premium is paid within 30 days of birth, and the policyholder has been insured continuously for 12 months or more at the date of birth. Its separate benefit for congenital and hereditary conditions in newborns requires the baby to be added within 30 days, on the same plan, and either parent to have been insured on one of the two upper plans for at least 12 months before the birth.
AXA approaches the same risk from the other end. Where a baby is added within 10 months of the plan start date, AXA requests the baby's medical history and may apply pre-existing condition limits, and there is no cover for a special care baby unit or paediatric intensive care immediately after birth in that scenario. The 10-month figure is doing the same job as William Russell's 12-month continuous-cover condition: it prevents a policy being taken out during a pregnancy in order to fund a neonatal admission.
Allianz Care's published position on the edge cases is narrower still — multiple births and adopted babies receive limited in-patient cover for the first three months.
The practical consequence is that the newborn question has to be settled before conception rather than after birth. If you are already planning around this, the waiting periods that govern the pregnancy itself are set out in maternity and fertility waiting periods compared, and the existing guide to maternity cover in international health insurance covers the treatment side.
One limit, or one each
The single most consequential thing to establish about a family policy is whether the headline number is shared.
Cigna states that its annual benefit maximum applies per beneficiary per period of cover. Bupa Global publishes an annual policy limit against each of its plans. AXA's handbook gives an overall plan limit per member. Those are not the same construction, and the marketing tables rarely make the distinction prominent.
For a family of four on a shared limit, one member's serious admission can consume most of the year's cover for everybody. On a per-member limit, it cannot. The difference is invisible until the year it matters, and it is worth confirming in writing before you compare two plans on the size of the number. The same reading discipline applies to the inner limits that sit beneath the headline figure, covered in annual benefit limits and inner limits.
Deductibles: usually per person, occasionally per family
Cost sharing is scoped the same way, and the default is per person.
Cigna is explicit: the deductible, cost share after deductible, and out-of-pocket maximum are determined separately for each beneficiary and each period of cover. AXA takes the excess off the first claim for each person in each year, and states that the excess applies per person. NIMBL runs two independent deductibles — one on core cover, one on the out-patient module — each applied per insured person per period of insurance, with no family aggregate and no out-of-pocket maximum stated anywhere in the wording.
The arithmetic follows. A deductible chosen to make an individual premium affordable is multiplied by the number of people in the household in a bad year. A family of four on a four-figure per-person deductible is exposed to four times that figure before the policy pays anything, and there may be no ceiling on the total.
A family deductible shared across the household rather than applied per person is the exception. Integra Global, now a division of HCI Group Global, publishes one as a distinctive feature, which tells you how uncommon it is. The mechanics of how these interact are set out in deductibles, excess, co-insurance and out-of-pocket maximums.
Underwriting runs person by person
Each family member completes the medical questions and is assessed individually. Exclusions and any premium loading attach to the person, not to the policy, so one member's history does not worsen anyone else's terms and a decline for one does not prevent the rest being accepted.
Two practical points follow. First, applications are time-limited and cannot be backdated: William Russell's form is valid for 28 days from receipt, with newborns the only exception to the no-backdating rule. Second, data consents are individual — the application cannot be processed without signatures from the policyholder and every dependant aged 18 or over.
Entry ages also differ by underwriting basis rather than by plan, which catches families with an age gap. On William Russell's personal range the policyholder and spouse must be under 76 for full medical underwriting, under 70 for continued personal medical exclusions on a switch, and under 40 for moratorium terms. A couple can therefore be eligible for different underwriting bases as each other, on the same application.
When the family lives in more than one country
Area of cover is the mechanism most likely to break a family arrangement, because it is set against the policy's declared country of residence rather than negotiated per person.
The extreme case is instructive. William Russell's Zone 7 gives full cover in most South East Asian countries and no cover anywhere else in the world. A family resident in Malaysia on that zone, with a child at boarding school in England, has a child with no cover at school. Less extreme zones create the same problem in softer form: Zone 2 restricts cover in the UK, EEA, UAE, Singapore, Hong Kong, Japan, Australia, Canada and the Caribbean to emergency treatment only.
The out-of-area provisions do not solve it either, because they are built for trips rather than residence. Cigna's out-of-area emergency cover for members on worldwide-excluding-USA terms is limited to three weeks per trip and 60 days per period of cover for all trips combined. A term at university is neither a trip nor an emergency.
Insurers also require immediate notification of a change of address, country of residency or country of nationality. A family member who relocates without telling the insurer has created a disclosure problem on top of a cover problem, and premiums are rated on country of residence, so the change is priced as well as recorded. The full mechanics are in area of cover explained.
Structural events that end a dependant's cover
Two events remove a dependant from a policy without anyone choosing it, and both carry short deadlines.
On the death of the policyholder, William Russell requires dependants to transfer to their own policy via a new application returned within 30 days of the date of death, after which cover continues on the same terms. On divorce or separation, the insured spouse or partner must transfer to their own policy within 30 days on the same basis. In both cases any enhancement of cover taken at the same time is medically underwritten, so the moment to restructure a plan is not the moment you are moving it.
What to check before you buy
Establish, in writing and from the policy wording rather than the brochure: the dependant age limits and the education extension; whether cover ends on the birthday or at the following renewal, and how long the child has to take out their own policy; the notification window and the prior-cover condition for adding a newborn; whether the annual limit is per policy or per member; whether the deductible is per person, and whether there is any family cap or out-of-pocket maximum; and whether the area of cover reaches every country a family member actually lives in.
If any member is likely to move independently of the rest — to university, to a posting, or into retirement in another country — settle that before renewal rather than after, because moving insurer to fix it restarts every clock in the policy. That trade-off is set out in switching IPMI insurer without losing continuity.
Frequently asked questions
At what age do children stop being eligible as dependants?
It varies by insurer and you have to read the wording rather than the brochure. William Russell's plan agreement sets the limit at under 18, or under 25 if in continuous full-time education, with proof required. The NIMBL documents disagree with themselves — the policy wording says under 21, or under 23 in full-time education, while the application form says under 21, or under 25 if unmarried and in full-time education. Where two documents from the same insurer conflict, the policy wording is the contract.
What happens to a child on the day they age off the policy?
Cover normally ends at the next renewal date rather than on the birthday itself. William Russell's agreement removes eligibility from the renewal date following the child's 18th birthday, marriage, or 25th birthday if in full-time education. The child may take out their own policy at adult rates if the application and premium arrive within 30 days of that renewal date. Miss the window and any later application is subject to fresh medical underwriting, which is the expensive outcome.
Can a newborn be added without medical underwriting?
Usually yes, if you act quickly and have held the policy long enough. William Russell adds a newborn without underwriting and backdates cover to the date of birth, provided the name and date of birth are notified and the additional premium is paid within 30 days of the birth, and the policyholder has been insured continuously for 12 months or more at the date of birth. Fail any of those conditions and the baby is underwritten as a new applicant.
Does a family policy share one benefit limit?
Read the wording of the limit itself. Cigna states its annual benefit maximum is per beneficiary per period of cover, so each insured person has the full amount. Bupa Global publishes an annual policy limit, and AXA an overall plan limit per member. The difference is material for a family with one seriously ill member, because a shared limit can be exhausted by one person's treatment, leaving everyone else with nothing for the rest of the year.
Is the deductible applied once for the whole family?
Normally no. Cigna states plainly that the deductible, cost share and out-of-pocket maximum are determined separately for each beneficiary and each period of cover. AXA applies the excess per person, taken from the first claim for each person in each year. NIMBL runs two deductibles, core and out-patient, each per insured person per period of insurance with no family aggregate. A genuine family deductible shared across the household, as Integra Global under HCI offers, is the exception rather than the rule.
Does one family member's medical history affect the others' terms?
Not on their terms, but it can affect the application. Each person is underwritten individually and receives their own exclusions and any loading, so a spouse's history does not attach to the children. What it can do is delay or complicate the application as a whole, and an applicant who is declined does not prevent the rest of the family being accepted. Applications are also time-limited — William Russell's form is valid for 28 days, and cover cannot be backdated except for newborns.
What happens if the family lives in more than one country?
This is the problem area, because area of cover is set against a declared country of residence for the policy, not per person. A restricted zone can leave a family member abroad effectively uninsured — William Russell's Zone 7 covers South East Asia and nothing else in the world. Insurers also require immediate notification of a change of address, country of residency or country of nationality, so an undeclared move by one member is a disclosure problem as well as a cover problem.
This guide is general information only and does not constitute financial, legal, medical or tax advice. Global Investments is not authorised by the Financial Conduct Authority. Insurance products, benefit schedules and premiums are revised regularly, and mandatory health insurance requirements change frequently — in several jurisdictions they are described differently even between official sources. Nothing here is a recommendation of any product or insurer. Confirm the legal position with the relevant regulator or a locally qualified adviser, and confirm cover terms with the insurer, before acting.