💰 Cost-Sharing Basics

Low Deductible Health Insurance: How Deductibles, Copays & Coinsurance Really Work

Q: What is the difference between a deductible and a copay?

A deductible is the total amount you pay out-of-pocket for covered services before insurance starts paying. A copay is a flat dollar amount for a specific service (like $30 for a primary care visit). Some copays apply before you meet the deductible (many plans let you see a primary care doctor for a copay before the deductible); others require the deductible to be met first.

Q: What is coinsurance and how is it different from a copay?

Coinsurance is a percentage (like 20%) you pay for a service after your deductible is met. Copay is a flat dollar amount (like $30). The key difference: coinsurance amounts vary with the cost of the service; copays don’t. A 20% coinsurance on a $200 visit is $40; on a $20,000 surgery, it’s $4,000. A $30 copay is $30 regardless.

Q: Does my deductible reset every year?

Yes — every plan year (typically January 1, or your plan’s renewal date). What you spent against the deductible in the prior year doesn’t carry over. The out-of-pocket maximum also resets. If you have a major medical event late in the year, you may end up paying both old-year and new-year deductibles within months.

Q: What does the out-of-pocket maximum actually cover?

The OOP max includes deductibles, copays, and coinsurance for covered in-network services. Once you hit the OOP max, insurance pays 100% of additional in-network covered care for the rest of the plan year. The OOP max does NOT include premiums, out-of-network care (usually), balance billing, or non-covered services. For 2027, ACA caps OOP max at $12,000 single / $24,000 family ($10,600 / $21,200 in 2026).

Q: Do copays count toward my deductible?

Usually no — copays typically don’t count toward the deductible (they’re a separate cost-sharing structure). But they almost always do count toward the out-of-pocket maximum. Always check your plan’s Summary of Benefits to confirm because plans vary.

Q: What is an embedded deductible on a family plan?

An embedded deductible means individual family members only need to meet their own individual deductible to start receiving coinsurance benefits, even if the larger family deductible isn’t fully met yet. This protects against catastrophic spending by one family member. Many ACA family plans have embedded deductibles; check your plan’s Summary of Benefits and Coverage. Some HDHPs are non-embedded — the entire family deductible must be met before insurance pays anything.

Q: Should I pick a high or low deductible?

Depends on your expected healthcare usage. Low deductible (Gold/Platinum): better if you use healthcare regularly (chronic conditions, growing family, expected procedures). High deductible (Bronze/HDHP): better if you’re healthy and rarely see doctors, especially if you can max an HSA for tax-free growth. For most people under 250% FPL, the answer is Silver with Cost-Sharing Reductions — lower deductible than standard Silver, lower premium than Gold.

Q: Do preventive care visits count toward my deductible?

No — preventive care is covered before the deductible at zero cost on all ACA-compliant plans. Annual checkups, vaccines, cancer screenings, contraception, blood pressure screenings, mental health screenings, well-child visits, and many other preventive services are free regardless of where you are on your deductible. Full preventive care list at Healthcare.gov.

Health insurance has five cost-sharing terms most people only half-understand — premium, deductible, copay, coinsurance, and out-of-pocket maximum. Each one means something specific, and they interact in a defined order. Here’s how it actually plays out at the doctor, urgent care, ER, and pharmacy, with real-dollar examples for families and a look at when a low deductible plan is worth its higher premium.

📝 12 min read 📅 Updated October 2026 ✅ From FreedInsure, an independent insurance broker

Quick answer: A deductible is what you pay for covered care before your plan starts paying; after that, you pay copays or coinsurance until you reach your out-of-pocket maximum. Low deductible health insurance charges a higher monthly premium so the plan starts sharing costs sooner. Gold and Platinum Marketplace plans usually have the lowest deductibles, and Silver plans with cost-sharing reductions lower them for incomes of 100%–250% of FPL. For 2027, ACA plans cap in-network out-of-pocket costs at $12,000 (individual) and $24,000 (family).

Last updated: October 6, 2026

Your health insurance has five cost-sharing pieces that determine what you pay. The premium is your monthly bill to the carrier (paid even when you don’t use healthcare). The deductible is what you pay out-of-pocket for covered services before the insurance starts paying. A copay is a flat dollar amount for specific services (like $25 for a doctor visit). Coinsurance is a percentage you pay after meeting your deductible (like 20%). The out-of-pocket maximum is the absolute cap on what you can spend in a year — everything above it is paid 100% by insurance. They interact in a specific order, and understanding that order saves real money.

In this article

1. The 5 cost-sharing terms
2. The order they kick in
3. Real-dollar examples
4. Family vs individual rules
5. In-network vs out-of-network
6. Metal tiers & low deductible plans
7. Cost-sharing reductions (CSR)
8. HDHP rules and HSAs

1. The 5 cost-sharing terms, defined

Premium

The monthly amount you pay the insurance company to maintain your coverage — whether or not you actually use any healthcare. Premium is the “membership fee” for insurance. On the ACA Marketplace, your premium is partially or fully offset by Advance Premium Tax Credits if your income qualifies.

Deductible

The amount you pay out-of-pocket for covered services before insurance starts paying. Most non-preventive services count toward the deductible. If your plan has a $3,000 deductible, you pay the first $3,000 of covered care during the year. Insurance starts paying a share after you hit it.

Preventive services (annual checkups, vaccines, screenings, contraception) are covered before the deductible at zero cost on every ACA-compliant plan. The deductible doesn’t apply to preventive care.

Copay (Copayment)

A flat dollar amount you pay for a specific service. Common copays:

Primary care visit: $20–$50
Specialist visit: $40–$80
Urgent care visit: $50–$100
ER visit: $250–$500
Generic prescription: $5–$15
Brand-name prescription: $30–$80

Some plans require you to meet the deductible before copays apply; others have copays available immediately (especially for primary care and generic drugs). Read your Summary of Benefits to know which structure your plan uses.

Coinsurance

A percentage you pay for covered services after meeting your deductible. If your coinsurance is 20%, you pay 20% of the cost and insurance pays 80%. Coinsurance applies most often to:

Hospital stays after deductible
Surgery
Imaging (MRI, CT scans)
Out-of-network care (typically higher coinsurance like 40–50%)

Out-of-pocket maximum (OOP max)

The absolute annual cap on what you pay in deductibles, copays, and coinsurance combined. Once you hit your out-of-pocket maximum, insurance pays 100% of covered in-network care for the rest of the plan year. For 2027, ACA-compliant plans cap OOP max at $12,000 single / $24,000 family ($10,600 / $21,200 in 2026).

Premiums DON’T count toward the OOP max. Out-of-network care often doesn’t count either (or has its own separate OOP max, sometimes uncapped).

2. The order cost-sharing kicks in

Cost-sharing operates in a defined sequence each plan year. Understanding this order tells you exactly what you’ll pay for any given service:

You pay premium every month, regardless of usage
Preventive care is covered free from day one (no deductible, no copay, no coinsurance)
Services with flat copays (depending on plan) may be available before or after deductible — check your plan
You pay the full deductible for non-preventive, non-copay services until you hit the dollar amount
After deductible, you pay coinsurance (e.g., 20%) and the plan pays the rest (e.g., 80%)
You hit the out-of-pocket maximum, and the plan pays 100% of covered services for the rest of the year
Plan year resets on January 1 (or your plan’s renewal date) — deductible and OOP max start over

The deductible/OOP max resets every plan year. If you’ve spent $4,500 against a $5,000 deductible by December 31, you don’t carry over the $4,500 — you start at zero again January 1. This is why some people who know they’ll need major care strategically time it in the same plan year.

3. Real-dollar examples

Example plan: Silver Marketplace plan

Premium after the tax credit: about $408/month for a single person with household income of $47,880, if this is the area’s benchmark Silver plan (2027 rules: $47,880 is 300% of the $15,960 poverty guideline used for 2027 coverage, and the expected contribution at 300% is 10.22% of income, or $4,893 a year). Your number depends on income, age and ZIP code; see our 2027 subsidy calculator.
Deductible: $4,000
Primary care copay: $30 (available before deductible)
Specialist copay: $60 (available before deductible)
ER copay: $400 + 20% coinsurance after deductible
Coinsurance: 20% (after deductible)
Out-of-pocket maximum: $8,000

Scenario 1: Annual physical (preventive)

You pay: $0
Why: Preventive care is covered before the deductible at zero cost on every ACA plan. Doesn’t matter where you are on your deductible.

Scenario 2: Primary care visit for a sinus infection

Visit cost: $180 (insurance-negotiated rate)
You pay: $30 copay
Insurance pays: $150
Why: Primary care has a flat copay available before deductible on this plan

Scenario 3: MRI for back pain

You haven’t met your deductible yet ($0 spent). MRI cost: $1,800.

You pay: $1,800 (full price applied to your deductible)
Insurance pays: $0
Deductible status after: $1,800/$4,000 met

Scenario 4: Specialist visit a week later

Visit cost: $250
You pay: $60 copay (specialist copay available before deductible on this plan)
Deductible status after: still $1,800/$4,000 (copay doesn’t count toward deductible on this specific plan; check your plan — some count copays)

Scenario 5: Surgery (outpatient)

Surgery cost: $12,000. You’ve spent $1,800 against deductible.

Deductible portion: $4,000 – $1,800 = $2,200 you pay to meet deductible
After deductible: Remaining $9,800 of surgery cost: 20% = $1,960 coinsurance, insurance pays 80% = $7,840
Total you pay for this surgery: $2,200 (deductible) + $1,960 (coinsurance) = $4,160
Year-to-date out-of-pocket: $1,800 (MRI) + $60 (specialist) + $30 (PCP) + $4,160 (surgery) = $6,050 (toward $8,000 OOP max)

Scenario 6: ER visit later that year

ER visit cost: $5,500. You’ve spent $6,050 toward $8,000 OOP max.

ER copay: $400 (counts toward OOP max)
Remaining $5,100: 20% coinsurance = $1,020
But wait — $400 + $1,020 = $1,420 you’d pay would put you at $7,470 toward OOP max. Capped at $8,000.
You’d actually pay: $1,420 (not capped this visit)
Year-to-date OOP: $7,470

Scenario 7: Another medical event in November

You’re at $7,470 OOP YTD. Another covered in-network procedure runs $4,000.

You pay: $530 (20% coinsurance would be $800, but you only owe the remaining gap to your $8,000 OOP max)
Insurance pays: $3,470
OOP max reached. Every covered in-network service for the rest of the year is $0 out of pocket.

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4. Family vs individual deductibles

Family plans have two deductible structures, and the difference matters when one family member has high medical needs.

Individual deductible (per person)

Each family member has their own personal deductible that must be met before insurance pays for that person’s care. Once a family member hits their individual deductible, insurance starts paying their coinsurance for them.

Family deductible (aggregate)

The total family deductible — usually a multiple of the individual deductible; your plan’s Summary of Benefits and Coverage shows the exact amount. Once the family collectively hits this amount, the deductible is satisfied for the whole family.

The embedded deductible (common on ACA family plans)

Many ACA family plans use an “embedded” structure: an individual family member only has to meet the individual deductible to have their care start paying coinsurance, even if the family deductible isn’t fully met. This protects single-person high-claim scenarios. Check your plan’s Summary of Benefits and Coverage to confirm how its family deductible works.

Example: family of 4, individual deductible $3,000, family deductible $6,000

One child has a $5,000 surgery in March:

Child meets their $3,000 individual deductible
On the remaining $2,000 of surgery cost, the child pays 20% coinsurance ($400) and insurance pays 80% ($1,600)
Other family members still have their own individual $3,000 deductible
Family spending so far: $3,000 (child’s deductible) + $400 (coinsurance) = $3,400 toward the out-of-pocket maximum. Only the $3,000 deductible portion counts toward the $6,000 family deductible.

The “non-embedded” trap (HDHPs)

High Deductible Health Plans — the ones tied to HSAs — can be non-embedded for family coverage. This means the entire family deductible must be met before insurance pays anything for anyone. Some HDHPs have an embedded family structure; others don’t. Read carefully if you have a family.

5. In-network vs out-of-network

Almost every plan has different cost-sharing for in-network vs out-of-network care:

In-network

Providers who’ve contracted with your insurance carrier at negotiated rates. You pay the lowest cost-sharing (lower deductible, lower coinsurance, lower copays). Insurance pays its full share.

Out-of-network

Providers who haven’t contracted with your carrier. You pay much higher cost-sharing:

Higher deductible (often a separate out-of-network deductible)
Higher coinsurance (often 40–50% vs 20%)
Higher out-of-pocket maximum (sometimes uncapped)
Balance billing — the provider can charge you the difference between their billed rate and what insurance allowed

HMO/EPO: in-network only

HMO and EPO plans don’t cover out-of-network care at all (except emergencies). If you go out-of-network voluntarily, you pay 100%.

PPO/POS: in and out-of-network

PPO and POS plans cover both, but out-of-network is much more expensive. See our HMO vs PPO guide for plan type differences.

Balance billing protection (No Surprises Act): Federal law as of 2022 protects you from “surprise” out-of-network bills for emergency services, air ambulance, and out-of-network care delivered at in-network facilities (like an out-of-network anesthesiologist at an in-network hospital). Still, intentional out-of-network care can result in significant balance billing.

6. How the Bronze/Silver/Gold/Platinum tiers compare

ACA Marketplace plans are sorted into four “metal tiers” based on their actuarial value — the average percentage of medical costs the plan pays:

Tier	Plan pays	You pay	Premium	Deductible	Best for
Bronze	~60%	~40%	Lowest	Highest	Healthy, rare healthcare use
Silver	~70%	~30%	Mid	Mid (lower with CSR)	Most people; CSR if eligible
Gold	~80%	~20%	Higher	Lower	Regular care users, families
Platinum	~90%	~10%	Highest	Lowest	Heavy users; rarely worth it

The pattern: Higher metal tier = higher premium, lower out-of-pocket costs when you use care. Lower metal tier = lower premium, higher out-of-pocket costs when you use care. For a healthy person who barely uses healthcare, Bronze wins. For someone with chronic conditions or expecting a major medical year, Gold or Platinum may save total money despite higher premiums.

Low deductible health insurance: when the higher premium pays off

A low deductible plan moves more of your cost into the premium. You pay more every month whether or not you use care, and in return the plan starts sharing costs sooner. On the Marketplace, Gold and Platinum plans usually have the lowest deductibles. If your household income is between 100% and 250% of the Federal Poverty Level, a Silver plan with cost-sharing reductions lowers your deductible, copays and out-of-pocket maximum (see section 7).

To decide, add up 12 months of premiums plus the deductible, copays and coinsurance you expect to pay under each plan, and compare the totals. A lower deductible tends to pay off if you have a chronic condition, regular prescriptions, a planned surgery or pregnancy, or a family that sees doctors often. If you rarely need care beyond free preventive visits, a higher deductible plan with a lower premium (possibly paired with an HSA) can cost less over the year. Either way, the 2027 out-of-pocket maximum of $12,000 for one person and $24,000 for a family on ACA plans limits what you pay for covered in-network care in a bad year (premiums are extra). Some plans go further with no deductible at all; see our guide to $0 deductible health insurance.

7. Cost-Sharing Reductions (CSR): the Silver plan secret

Cost-Sharing Reductions are extra subsidies that reduce your deductible, copays, and out-of-pocket max — but only if you enroll in a Silver-tier plan. CSR is available if your household income is between 100% and 250% of the Federal Poverty Level.

CSR tiers (2027 coverage)

Income (% of FPL)	Silver plan with CSR pays	2027 out-of-pocket max (self / family)
100–150% FPL	~94% of costs	$4,000 / $8,000
150–200% FPL	~87% of costs	$4,000 / $8,000
200–250% FPL	~73% of costs	$9,600 / $19,200
Above 250% FPL	~70% (standard Silver)	$12,000 / $24,000

Out-of-pocket maximums are from CMS’s 2027 cost-sharing guidance. Deductibles on CSR plans vary by plan, but they are usually lower than on a standard Silver plan.

Why the Silver plan trap matters

If you qualify for CSR, a Silver plan acts almost like a Gold or Platinum plan for cost-sharing — with Silver’s lower premium. Bronze plans look cheaper on premium but lose access to CSR, meaning you pay much higher out-of-pocket. For most people under 250% FPL, Silver+CSR is dramatically better than Bronze.

8. HDHP rules and HSAs

High Deductible Health Plans (HDHPs) are plans with deductibles above IRS thresholds that qualify the enrollee to contribute to a Health Savings Account (HSA). For 2027, an HDHP must have:

Minimum deductible: $1,750 single / $3,500 family ($1,700 / $3,400 in 2026)
Maximum OOP: $8,700 single / $17,400 family ($8,500 / $17,000 in 2026)
No coverage before the deductible (except preventive)

Starting in 2026, bronze and catastrophic plans that are available as individual coverage through the Marketplace also count as HDHPs, even if they don’t meet these deductible and out-of-pocket tests (IRS Notice 2026-5). For more on whether one fits you, see our high deductible health plan guide.

HSA contribution limits (2027)

Self-only HDHP: $4,500/year ($4,400 in 2026)
Family HDHP: $9,000/year ($8,750 in 2026)
Age 55+ catch-up: additional $1,000/year (see 2027 vs 2026 HSA limits)

The HSA triple tax advantage

Contributions are tax-deductible for federal income tax (state rules vary)
Growth inside the account is tax-free (you can invest in mutual funds, ETFs, stocks)
Withdrawals for qualified medical expenses are tax-free at any age
After age 65: non-medical withdrawals taxed like a Traditional IRA (no penalty)

HSAs are one of the most tax-efficient ways to pay for medical expenses. If you’re healthy, an HDHP with steady HSA contributions can beat a lower-deductible plan on total cost, but investment returns inside an HSA aren’t guaranteed.

Sources

HealthCare.gov: Deductible — what you pay for covered services before your plan starts to pay
HealthCare.gov: Coinsurance — the percentage of covered costs you pay after your deductible
HealthCare.gov: Out-of-pocket maximum/limit — $10,600 / $21,200 for 2026 and $12,000 / $24,000 for 2027
IRS Publication 969 — 2026 HSA contribution limits and HDHP deductible and out-of-pocket rules
IRS Rev. Proc. 2026-24 (PDF) — 2027 HSA contribution limits and HDHP minimum deductibles and out-of-pocket maximums
CMS: 2027 cost-sharing parameters (PDF) — 2027 out-of-pocket maximums, including cost-sharing reduction Silver plans
IRS Notice 2026-5 (PDF) — bronze and catastrophic Marketplace plans treated as HDHPs starting in 2026
IRS Rev. Proc. 2026-26 (PDF) — 2027 expected contribution percentages used in the premium example