This article is general information, not insurance, medical or financial advice. Drug coverage rules and prices vary by plan, country and state, and decisions about your medication belong with your prescriber and pharmacist.
For many people, the biggest predictable health expense is not hospital care but the prescriptions they refill every month. When that is true, a plan’s premium and deductible only tell part of the story. What matters just as much is how the plan covers your particular drugs, because that can differ more from plan to plan than almost anything else.
Start with a list, not a plan
Before comparing anything, write down what you take:
- The exact drug name, strength and form (tablet, injection, inhaler and so on).
- How often you fill it and how many days each fill covers.
- Whether you use a brand-name or generic version.
- Which pharmacy you use, and whether you use mail delivery.
- Any drugs that a doctor may add or change in the coming year.
That list becomes the test you apply to each plan. A plan that looks inexpensive overall can be a poor fit if it does not cover a drug you need, or covers it at a high price.
The formulary: is your drug covered?
A formulary is the plan’s list of covered drugs. Plans may refer to it as a drug list. Two plans from the same insurer can have different lists, and a list can change from year to year, so check the current one. Things to look for:
Is the drug listed at all? If not, you may pay the full price, or you may need to ask for an exception, which typically requires your prescriber’s input.
Is it a covered brand or only a generic? Many plans prefer generic versions, which can cost less. Our article on generic drug savings covers the general price difference between generics and brands.
Are there conditions attached? Some drugs are covered only after approval, or only after you try a different drug first. These are known as prior authorization and step therapy. Both can delay a start or change what you take, so find out if either applies to your medication.
Are there quantity limits? A plan may limit how much it covers in a given period, which can matter if your dose is unusual.
Cost tiers: what you pay at the counter
Most plans group drugs into tiers, with each tier having its own cost. In general terms:
- Lower tiers tend to hold common generics, with the smallest payments.
- Middle tiers often hold preferred brand-name drugs.
- Higher tiers, sometimes called specialty tiers, often hold costly or complex drugs and may require coinsurance rather than a fixed copay.
Tier placement is where plans differ most. The same drug might sit in a low tier on one plan and a high tier on another. Understanding copay and coinsurance helps, since a flat fee and a percentage behave very differently when a drug is expensive.
How the deductible interacts with drugs
Plans treat the deductible differently for prescriptions. Some apply it to drugs, so you pay the full negotiated price early in the year until you have met the deductible. Others have a separate drug deductible, or charge a copay from the first fill. This matters most with a costly drug.
A hypothetical illustration, with made-up numbers: suppose a drug has a negotiated price of 200 per month. If a plan makes you pay that full price until a deductible is met, your first months are costly. If another plan charges a flat 30 per month from the start, your early costs are lower, though its premium could be higher. Over a year, you would need to add the premium to the drug spending to compare them fairly. Only a calculation using your real numbers will tell you which is better.
Add it all up for a year
Comparing plans for ongoing medication works best as a yearly estimate:
- Take the annual premium (monthly premium times twelve).
- Add the yearly cost of each of your drugs under that plan, using its tier or price rules.
- Add a reasonable allowance for regular doctor visits and tests related to your condition.
- Look at the out-of-pocket maximum, which is the ceiling on what you could pay in a year for covered care.
This produces a realistic range rather than a single number. Keep in mind the out-of-pocket maximum may not count every expense, such as drugs not on the formulary or care outside the network, so read the plan documents.
Pharmacy network and delivery
Plans often have preferred pharmacies, where your cost is lower. Some require or encourage mail-order for long-term drugs, sometimes with a discount for 90-day supplies. Check whether your pharmacy is in the network and whether a longer supply is allowed. Provider networks apply to doctors too, so make sure the prescriber who manages your condition is in-network.
When your medication is for a long-term condition
If your drugs treat a continuing condition, other parts of the plan also matter, such as specialist access and referrals, lab work and monitoring. Our article on the impact of chronic illness on insurance options discusses the wider picture. It is also worth knowing that in some places, plans cannot turn people away because of pre-existing conditions, but rules differ, so verify what applies where you live.
Before you commit
- Check the formulary for the plan year you are enrolling in.
- Ask your prescriber whether alternatives exist, in case your drug is not covered.
- Call the plan or read its documents about prior approval, quantity limits and exceptions.
- Look for a transition or temporary supply rule if you are switching plans mid-treatment.
- Keep your first-fill receipts and plan letters, in case a coverage question arises later.
If a drug is denied, you may have the right to appeal, and learning how a claim appeal works ahead of time can save stress. Premiums, tiers and lists change, so recheck each year at enrollment rather than assuming last year’s plan still fits.