Deductibles, Copays & Coinsurance: How It Really Works

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 2026, ACA-compliant plans cap OOP max at $9,650 single / $19,300 family.

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:

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

3. Real-dollar examples

Example plan: Silver Marketplace plan

• Premium (post-subsidy): $120/month
• 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’ve hit $7,800 OOP YTD. Another procedure runs $4,000.

• You pay: $200 (the remaining gap to $8,000 OOP max)
• Insurance pays: $3,800
• OOP max reached. Every covered in-network service for the rest of the year is $0 out of pocket.

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 2x to 2.5x the individual deductible. Once the family collectively hits this amount, the deductible is satisfied for the whole family.

The embedded deductible (most ACA plans)

ACA-compliant plans must 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.

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
• Insurance starts paying coinsurance on the remaining $2,000 of surgery cost
• Other family members still have their own individual $3,000 deductible
• The total family spending so far: $3,000 (child’s deductible) + $400 (coinsurance on the surgery overage) = $3,400 toward $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.

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:

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.

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 (2026)

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 2026, an HDHP must have:

• Minimum deductible: $1,650 single / $3,300 family
• Maximum OOP: $8,300 single / $16,600 family
• No coverage before the deductible (except preventive)

HSA contribution limits (2026)

• Self-only HDHP: $4,300/year
• Family HDHP: $8,550/year
• Age 55+ catch-up: additional $1,000/year

The HSA triple tax advantage

• Contributions are tax-deductible (federal, and most states)
• 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 the most tax-efficient retirement vehicle for medical expenses the IRS offers. If you’re healthy, an HDHP with maxed HSA contributions often beats lower-deductible plans for total long-term cost.