Drug formulary tiers and oral cancer medicines

Two ideas explain almost every surprise you hit at the pharmacy counter.

The first is the formulary. It is a plan's list of covered drugs. It includes both brand-name and generic medicines, and each plan chooses which specific drugs go on it.

The second is tiers. Plans sort the drugs on that list into cost levels. Medicare.gov gives this example:

• Tier 1 — generic drugs, with the lowest copay
• Tier 2 — preferred brand-name drugs, with a medium copay
• Tier 3 — non-preferred brand-name drugs, with a higher copay
• Specialty tier — very high cost drugs, with the highest copay

The rule is simple. Drugs in lower tiers cost you less than drugs in higher tiers.

Your medicine's price is not really about the medicine. It is about where your plan filed it.

Medicare.gov says the specialty tier holds very high-cost drugs, and it carries the highest copay. Many oral cancer medicines are costly, so they may be placed there. That can explain why a generic pill costs little while a cancer pill costs far more on the same plan.

It also explains why two people on the same drug can pay very different amounts. Each plan builds its own formulary and sets its own tiers. So placement is a plan decision. It is not a fixed fact about the drug itself.

Medicare says each drug list must include at least 2 drugs in the most commonly prescribed categories and classes. Plans must also cover most drugs in certain classes. Cancer drugs are one of them, along with HIV/AIDS drugs, antidepressants, antipsychotics, anticonvulsants and transplant immunosuppressants.

That protection covers categories, not any single product. Your specific medicine may still be missing from a given plan's list, or it might be there but placed on the specialty tier. So "cancer drugs must be covered" and "my drug is covered at a price I can afford" are two different things.

Suppose your prescribed drug is not on the formulary, or sits on a high tier. You or your prescriber can ask for an exception. The plan may agree to cover a drug that is not listed, or waive a coverage rule. A "tiering exception" asks for a lower cost on a non-preferred tier drug. Medicare.gov says your prescriber must give a supporting statement explaining the medical reason.

Be clear about what you are asking for: coverage of an unlisted drug, or a lower copay. The key piece is the supporting statement from your prescriber.

Ask your oncology team who handles this kind of request. Some cancer centers have pharmacy or financial navigation staff who can help.

A short checklist can save real trouble later:

• Look up the drug on your plan's formulary before your first fill, not at the counter.
• Ask which tier it sits on, and what that means for your share of the cost.
• Ask your team if a covered alternative would work medically for you.
• If the answer is no, ask your prescriber about starting the exception request right away.
• Ask about copay assistance programs while the exception is pending.

None of this means settling for a cheaper drug that is wrong for you. It means finding out what you are facing early enough to actually do something about it, instead of learning it on the day treatment was supposed to start.