The Cost Waterfall: How Every Dollar Flows
1
You Pay 100% Until You Hit Your Deductible
The deductible is the amount you pay each year before your insurance starts sharing costs. If your deductible is $1,500, you pay the first $1,500 of covered medical bills yourself. Most services count toward it, but not copays, and not premiums.
Example: $1,500 deductible. You have an MRI that costs $800. You pay $800. Deductible remaining: $700.
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2
You Pay Coinsurance Until You Hit Your OOP Max
Once your deductible is met, you split costs with your insurer. An 80/20 plan means they pay 80%, you pay 20%. A 70/30 plan: they pay 70%, you pay 30%. This continues until you reach your out-of-pocket maximum.
Example: Deductible met. Surgery costs $10,000. With 20% coinsurance, you owe $2,000. Plan pays $8,000.
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3
Plan Pays 100% Once You Hit Your OOP Max
The out-of-pocket maximum is your financial ceiling for the year. After you reach it, your plan pays 100% of covered in-network services. ACA law caps OOP max at $9,450 (individual) / $18,900 (family) for 2024.
Example: OOP max $7,000. You've paid $7,000 in deductible + coinsurance. The rest of the year: $0 for covered in-network care.
Individual vs. Family Deductibles: How They Stack
👤 Individual Deductible
Each person on the plan has their own individual deductible. Once one person meets their individual deductible, the plan starts cost-sharing for that person; even if the family deductible isn't met yet.
Example: Individual deductible $1,500, family $3,000. Person A spends $1,500. Plan starts paying for Person A. Family deductible still has $1,500 remaining.
👪 Family Deductible
The family deductible is the combined ceiling. Once the family collectively reaches it, the plan starts cost-sharing for everyone; even family members who haven't met their individual deductible.
Example: Family deductible $3,000. Person A paid $1,500, Person B paid $1,500. Family deductible met; plan now pays for all family members.
⚠ Embedded vs. Non-Embedded Deductibles: Most plans use an embedded deductible; each person has both an individual and family limit. Non-embedded (aggregate) plans have no individual deductible; the family must collectively hit the family deductible before anyone gets coverage. Non-embedded plans are common in HSA-eligible HDHPs and can result in unexpectedly large bills.
Legal limit: For non-grandfathered plans, no individual in a family plan can be required to pay more than the ACA self-only OOP maximum ($9,450 in 2024) before the plan pays for them; even with an aggregate deductible. Check your SBC.
Copay vs. Coinsurance: What's the Difference
💴 Copay (Flat Dollar)
A fixed dollar amount you pay per visit regardless of the total cost. $30 PCP copay means you always pay $30; whether the visit costs $100 or $400. Copays typically do not count toward your deductible (check your plan), but they DO count toward your OOP max.
Typical copays: PCP $20–40 | Specialist $40–70 | Urgent Care $50–100 | ER $150–350 | Telehealth $0–30
📈 Coinsurance (Percentage)
A percentage of the cost you pay after your deductible is met. 20% coinsurance on a $500 bill = $100. The amount varies with the cost of the service; unlike a flat copay. Coinsurance always counts toward your deductible and OOP max.
Common splits: 80/20 (you pay 20%) | 70/30 (you pay 30%) | 60/40 (you pay 40%) | 50/50 (you pay 50%)
🟢 Always $0: No Deductible, No Copay (ACA Plans)
Under the ACA (42 USC §300gg-13), all individual and small group plans must cover these services at zero cost-sharing for in-network providers; no deductible, no copay, no coinsurance.
💋 Preventive Screenings
Colonoscopy (colorectal cancer screening)
Mammogram (women 40+, or 50+ per USPSTF)
Cervical cancer screening (Pap smear)
Lung cancer CT scan (heavy smokers 50–80)
Abdominal aortic aneurysm ultrasound (men)
Osteoporosis screening (women 65+)
Depression screening (adults)
Diabetes screening (adults with risk factors)
HIV screening (adults 15–65)
Blood pressure screening
💊 Medications at $0
PrEP (HIV prevention): pill and monitoring labs
Statins (cardiovascular prevention, age 40–75)
Low-dose aspirin (cardiovascular, if prescribed)
Tobacco cessation medications
Contraceptives (FDA-approved methods)
Folic acid supplements (pregnant/planning)
Breastfeeding support and supplies
👨⚕️ Annual Wellness Visits
Annual physical / preventive visit (all ages)
Well-child visits (0–21, per AAP schedule)
Adolescent immunizations
Adult immunizations (flu, Tdap, hepatitis B)
Obesity counseling and behavioral intervention
Alcohol misuse counseling
Tobacco cessation counseling (8 sessions/year)
Medicare Annual Wellness Visit (G0439): $0
💐 Women's Preventive Services
BRCA counseling and genetic testing (high risk)
Gestational diabetes screening
HPV testing (cervical cancer prevention)
STI counseling
Domestic violence screening and counseling
Anemia screening (pregnant women)
Urinary incontinence screening
⚠ The Colonoscopy Trap: If your colonoscopy is scheduled as a preventive screening but polyps are found and removed, some plans improperly charge cost-sharing for the "therapeutic" polypectomy. This is wrong; the ACA and multiple court decisions confirm a screening colonoscopy does not lose its preventive character when a polyp is removed. Fight any cost-sharing charge for a screening colonoscopy. Cite 42 USC §300gg-13.
⚠ ERISA Employer Plans: Large employer (ERISA) self-funded plans are not required to cover all ACA preventive services if the plan existed before the ACA and has not changed significantly ("grandfathered"). Check your Summary Plan Description for grandfathered status.
📅 When Does Your Deductible Reset? It Depends on Your Plan.
Not all deductibles reset on January 1. The reset date depends entirely on your plan type and plan year. Getting this wrong can result in costly timing mistakes around major procedures.
ACA Marketplace Plans Always follow the calendar year. January 1 through December 31.
Medicare Part B Resets January 1 each year. The 2024 Part B deductible is $240.
Medicare Part D (Drug) Resets January 1. Starting 2025, the OOP cap is $2,000 per year.
Medicare Advantage (Part C) Plan year runs January 1 through December 31 in all cases.
Most Individual State Plans Fully-insured individual and family plans purchased outside the marketplace almost always follow the calendar year.
Large Employer (ERISA) Plans The employer chooses the plan year. Common non-calendar plan years: July 1, October 1, April 1. Your HR department or your Summary Plan Description (SPD) is the only reliable source. Do not assume January 1.
Union / Taft-Hartley Plans Set by the Board of Trustees. Often non-calendar. Check your SPD or call the union benefits office directly.
Small Employer Fully-Insured Plans May follow the calendar year or the employer's chosen renewal date. Ask HR or check the SBC.
CHIP Varies by state. Contact your state CHIP program for your specific renewal date.
Medicare Part A Does NOT reset annually. Part A uses benefit periods. A benefit period begins when you are admitted to a hospital or SNF and ends 60 days after you are discharged. You can have multiple benefit periods and owe multiple Part A deductibles in a single calendar year. The 2024 Part A deductible is $1,632 per benefit period.
Traditional Medicaid Generally has no annual deductible in the traditional sense. Cost-sharing rules vary significantly by state and eligibility category. Contact your state Medicaid agency for specifics.
Medicaid Managed Care Plan year typically follows the state's Medicaid program year. Contact your MCO or state agency.
🔍 How to Find Your Plan Year Start Date:
On your SBC: Look for "Coverage Period" or "Plan Year" on the first page. It will show a date range such as 01/01/2024 to 12/31/2024 or 07/01/2024 to 06/30/2025.
On your EOB: Look for columns labeled "Plan Year to Date" or "YTD Accumulation." The start date of the accumulation period tells you when your plan year began.
Call your insurer: Ask exactly: "What is my plan year start and end date?" and "On what date does my deductible reset?" Get the answer in writing by requesting a follow-up email or a reference number for the call.
For employer plans: Ask HR: "What is our benefits plan year?" This is different from the calendar year and different from open enrollment dates. Many HR teams assume you know, so ask specifically.
💡 Timing Tip: If you have met your deductible and are considering an elective procedure, schedule it before your plan year end, not after. A procedure straddling two plan years can mean you pay two full deductibles for services that, timed correctly, would have cost you nothing beyond your already-met deductible.
🚨 The 5 Most Common Cost-Sharing Traps
1. The Separate Deductible Trap
Some plans have a separate deductible for prescriptions, mental health, or out-of-network care. You can hit your medical deductible and still owe full price for medications. Check your Summary Plan Description for separate deductible structures.
2. The Copay Doesn't Count Trap
On many plans, copays do NOT count toward your deductible; only toward your OOP max. This means you can pay hundreds in copays and still owe your full deductible when you need a procedure. Always verify this in your plan documents.
3. The OOP Max Doesn't Cover Everything Trap
Your OOP max only applies to covered in-network services. Out-of-network costs, non-covered services, and balance bills from surprise billing do NOT count toward your OOP max and don't stop at any ceiling.
4. The Preventive-Turns-Diagnostic Trap
You schedule a preventive screening. The doctor notices something and addresses it in the same visit. The visit gets billed as diagnostic; and suddenly you owe your deductible and coinsurance. Ask your doctor to bill the preventive visit separately from any diagnostic services.
5. The Mid-Year Plan Change Trap
If you change plans mid-year (new job, open enrollment), your deductible and OOP max reset to zero on the new plan. Any amounts accumulated under the old plan do not transfer. Plan major procedures before a plan change when possible.