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Last updated March 25, 2026 6 min read

Top 7 Mistakes to Avoid When Buying Health Insurance

Don't make these costly mistakes when buying health insurance. Learn what to watch out for, from choosing the wrong premium to ignoring network hospitals and enrollment deadlines.

PE

By Policymage Editorial Team

Health Insurance Research

Last reviewed

Mar 25, 2026

Choosing the wrong health insurance can cost you thousands of dollars and leave you without coverage when you need it most. These are the 7 most common (and expensive) mistakes people make when buying health insurance – and how to avoid them.

Mistake #1: Choosing the Lowest Premium Without Checking Total Cost

This is the #1 mistake – and the most expensive one.

Real Story:

John chose a plan with $150/month premium to save money. When he broke his arm, he paid $8,000 out-of-pocket before insurance kicked in. A plan with $350/month premium would have cost him only $2,500 total.

Result: "Saving" $200/month cost him $5,500 extra.

Why This Happens

Low premium plans have:

  • High deductibles ($7,000-$9,000)
  • High copays ($75+ per visit)
  • High coinsurance (30-40% after deductible)

How to Avoid It

✅ Calculate total yearly cost:

(Monthly Premium × 12) + Expected medical costs + Deductible

Compare this number across 3-5 plans, not just the premium.

Mistake #2: Ignoring Network Restrictions

Your insurance is worthless if none of your doctors accept it.

Real Story:

Sarah chose an HMO to save $100/month. Her longtime cardiologist wasn't in the network. She either had to: (1) Pay $200+ per visit out-of-pocket, or (2) Find a new doctor who knew nothing about her 10-year medical history.

What to Check

  • ✅ Your primary care physician
  • ✅ Any specialists you see regularly
  • ✅ Your preferred hospital
  • ✅ Your kids' pediatrician
  • ✅ Mental health providers (if applicable)

How to Check

  1. Get the plan's provider directory (online)
  2. Call your doctor's office to confirm they accept it
  3. Check if they're "in-network" or just "accepted"

Pro Tip: Networks change yearly. Even if your doctor was in-network last year, verify they still are.

Mistake #3: Not Understanding Deductibles

Many people don't realize they have to pay the FULL deductible before insurance covers most care.

Common Misconception

❌ Wrong Thinking:

"I have a $5,000 deductible, but my doctor visits are only $30 copay, so I'm good."

✅ Reality:

Doctor visits might have copays, but surgery, ER visits, imaging, and most other care requires you to pay the full $5,000 deductible first.

What IS Covered Before Deductible

  • ✅ Preventive care (annual check-ups, vaccines)
  • ✅ Some primary care visits (plan dependent)

What IS NOT Covered Until Deductible Is Met

  • ❌ Emergency room visits
  • ❌ Surgeries
  • ❌ MRI/CT scans
  • ❌ Hospital stays
  • ❌ Specialist visits (some plans)

Mistake #4: Missing Open Enrollment Deadlines

Miss the deadline = no insurance for an entire year (unless you have a qualifying life event).

Key Dates for 2026

  • November 1 - January 15: Open Enrollment Period
  • December 15: Deadline for January 1 coverage
  • January 15: Final deadline for February 1 coverage

Special Enrollment (Can Enroll Anytime If You Have)

  • Lost job-based coverage
  • Got married/divorced
  • Had a baby or adopted
  • Moved to a new state

Warning:

"I quit my job" is NOT a qualifying event. "I lost my employer coverage" IS a qualifying event. The distinction matters!

Mistake #5: Not Checking Prescription Drug Coverage

Your $20/month generic might cost $300/month under a different plan.

What to Check

  1. 1. Is your medication on the formulary?
    Each plan has a list of covered drugs
  2. 2. What tier is it?
    • Tier 1: Generics ($10-20)
    • Tier 2: Preferred brand ($50-100)
    • Tier 3: Non-preferred ($150-300)
    • Tier 4: Specialty ($500+)
  3. 3. Are there restrictions?
    Prior authorization, quantity limits, step therapy

Pro Tip:

Use the plan's online formulary checker. Enter ALL your medications BEFORE enrolling.

Mistake #6: Ignoring Out-of-Pocket Maximum

The out-of-pocket maximum is your safety net against catastrophic costs – yet many people don't even look at it.

What Is It?

The most you'll pay in a year for covered services. After you hit this limit, insurance pays 100% of everything else.

Plan LevelTypical OOP MaxWhat This Means
Bronze$9,450High risk for big bills
Silver$7,000-8,000Moderate protection
Gold$5,000-6,000Better protection
Platinum$3,000-4,000Best protection

Important: Federal max for 2026 is $9,450 for individuals, $18,900 for families. Plans can't exceed this.

Mistake #7: Auto-Renewing Without Shopping Around

Your current plan's price probably went up. New plans might be cheaper AND better.

Why Plans Change

  • Premiums increase 5-15% yearly
  • Networks get smaller (doctors drop out)
  • Coverage benefits change
  • New plans become available
  • Your subsidy amount changes

What to Do Every Open Enrollment

  1. Check your current plan's new price
  2. Compare with at least 3 other plans
  3. Verify your doctors are still in-network
  4. Recalculate your subsidy (income changes?)
  5. Look for new plan options

Real Result:

People who shop around during open enrollment save an average of $1,200/year vs those who auto-renew.

Bonus Mistakes (Avoid These Too)

8. Not Using Preventive Care

It's 100% free – use it! Annual check-ups, vaccines, cancer screenings all covered.

9. Going Out-of-Network "Just Once"

One out-of-network ER visit = $10,000+ bill. Always check first (if possible).

10. Forgetting to Add Life Events

Had a baby? Got married? You have 60 days to update your plan or add dependents.

Your Action Plan to Avoid These Mistakes

Before Choosing a Plan, Make Sure You've:

  • ☐ Calculated total yearly cost (not just premium)
  • ☐ Verified your doctors are in-network
  • ☐ Checked all prescription drug coverage
  • ☐ Reviewed the deductible and out-of-pocket max
  • ☐ Compared at least 3 different plans
  • ☐ Considered your expected healthcare usage
  • ☐ Noted the enrollment deadline
  • ☐ Read the Summary of Benefits document

Don't Make These Mistakes – Compare Plans Smart

Avoid costly mistakes by using a comparison tool that shows you total costs, network doctors, and drug coverage all in one place.

Compare Plans the Smart Way

PolicyMage shows you total costs, not just premiums. See which plans cover your doctors and medications. Get it right the first time.

Find Your Best Plan →

Authoritative Sources

The facts and figures in this article are sourced from US federal agencies that administer ACA Marketplace health insurance:

  • HealthCare.gov — federal ACA marketplace
  • Official Marketplace — official program rules and quality rating methodology
  • IRS — Affordable Care Act — Premium Tax Credit (APTC) rules and HSA/HDHP limits (Publication 969)
  • HHS Federal Poverty Level Guidelines — annual FPL income thresholds for subsidy eligibility

Policymage is not a licensed insurance broker or advisor. For personalized guidance, consult a licensed insurance professional or refer to our data methodology.

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