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Health Insurance Mistakes Kiwis Make — And How to Avoid Them

The most common and costly health insurance mistakes New Zealanders make — and the simple ways to avoid them.

20 April 20268 min readNZ Insurance Adviser Team

Mistake 1: Choosing Surgical Cover When You Have a Chronic Condition

The most common mistake: selecting surgical-only cover to save money when you actually need specialist consultations regularly.

Reality: A person with arthritis needs 2-4 specialist appointments per year. At $350 per appointment, that's $700-1,400/year out-of-pocket. A major medical cover costs $100-150/month more ($1,200-1,800/year) but saves $700-1,400 in specialist costs.

Avoid this: Ask yourself honestly: "Will I see a specialist more than once per year?" If yes, major medical is cheaper overall.

Mistake 2: Failing to Disclose Full Medical History

Some people omit minor health conditions (well-controlled hypertension, childhood asthma, past anxiety) thinking they don't matter.

They matter. Insurers can cancel cover or refuse claims if you've omitted relevant information.

Avoid this: Disclose everything. No shame in having managed health conditions.

Mistake 3: Choosing the Lowest Excess Without Emergency Savings

A $1,000 excess saves $300-400/year in premiums. But if you don't have $1,000 in emergency savings, that excess becomes a crisis if you need to claim.

Avoid this: Only choose high excess if you have minimum 2x the excess amount in emergency savings. Otherwise, a lower excess is proper insurance.

Mistake 4: Not Understanding Your Annual Cap

Health insurance policies have annual caps ($20,000-30,000 typically). Once you've claimed that amount, you pay out-of-pocket for remaining services that year.

Many people don't understand their cap until they hit it mid-year during a serious illness.

Avoid this: Read your policy. Know your annual cap. Understand how it applies to your situation.

Mistake 5: Assuming Dental and Vision Add-Ons Are Good Value

Dental coverage: Insurance reimburses $500-1,000 of dental work per year. Real dental costs for basic care: $200-300/year. The add-on might cost $20-30/month for minimal benefit.

Vision coverage: Similar story. Regular glasses/contacts cost $200-300/year; insurance reimburses less than the premium.

Avoid this: Calculate whether the add-on reimburses more than the premium. Usually, it doesn't.

Mistake 6: Switching Insurers During Active Treatment

If you're being treated for a health condition and you switch insurers, the new insurer will likely exclude that condition as pre-existing.

Avoid this: Never switch insurers if you're in active medical treatment or investigation for a health condition.

Mistake 7: Not Reviewing Your Cover Annually

Life changes — family grows, income changes, health changes. A policy that was perfect at 35 might be wrong at 45.

Avoid this: Review your policy every 12 months. Does it still fit your life? Are you paying for things you don't need? Are there things you need that aren't covered?

BestHealthInsurance.co.nz — We're passionate about helping Kiwis find the right health insurance policy for their needs and budget. We're an independent comparison and referral service — when you enquire, we connect you with a licensed NZ insurance adviser who compares all major providers (Southern Cross, nib, AIA, Accuro/UniMed, and Partners Life) on your behalf. The advisers we work with are paid by providers when you take out a policy. There is no cost to you.