Does Medicare Part D Cover Kalydeco?
Yes — Kalydeco (Ivacaftor) is covered under Medicare Part D, filled by 4,200 beneficiaries across 36,000 claims in the latest year. It typically sits on tier 4-5 (specialty) of standard Part D formularies. Specialty drugs use coinsurance (25-33% of plan-negotiated price), not flat copays. The 2025 Part D annual out-of-pocket cap is $2,000.
Kalydeco Medicare Coverage & Out-of-Pocket Cost
Kalydeco is covered under Medicare Part D, with the program paying an average of $15,750 per prescription fill. Kalydeco typically falls on Tier 4-5 (specialty) of standard Part D formularies. Specialty drugs use coinsurance (25-33% of plan-negotiated price), not flat copays. The 2025 Part D annual out-of-pocket cap is $2,000.
Your actual out-of-pocket cost depends on three factors: (1) formulary tier — your plan's specific placement; (2) deductible status — most plans require you to meet up to a $590 deductible (2025) before copays kick in; (3) coverage phase — initial coverage, then the donut hole was eliminated in 2025, replaced by a hard $2,000 annual out-of-pocket cap under the Inflation Reduction Act. Once you hit $2,000 in true out-of-pocket spending, the rest of your Part D drugs are free for the year.
Because generic Ivacaftor is available, the single biggest savings move is asking your pharmacist about generic substitution. Generics typically sit on Tier 1 with copays under $10, vs Tier 2-3 placement for brand-name Kalydeco. Most states allow automatic substitution unless your prescriber writes "dispense as written."
For cash-pay or commercial insurance scenarios, compare prices using GoodRx, SingleCare, or Cost Plus Drugs before filling — discount-program prices sometimes beat Part D copays for lower-cost generics.
How to Confirm Kalydeco Coverage & Handle a Denial
Medicare Part D coverage of Kalydeco is set plan-by-plan, not nationally. To confirm your plan covers it, look up Kalydeco in the Medicare Plan Finder or your plan's online drug list, and check three flags: the formulary tier (drives your copay), prior authorization (PA), and step therapy (ST) or quantity limits.
Because Kalydeco is a higher-cost drug, plans are more likely to require prior authorization or step therapy — meaning you may need to try a lower-cost alternative first, or your prescriber must document why Kalydeco is medically necessary. If your plan denies coverage, you have the right to a formulary exception: your prescriber submits a statement of medical necessity, and the plan must respond within 72 hours (24 hours if expedited).
A denial can be appealed through five levels — redetermination by the plan, an independent review entity, an Administrative Law Judge, the Medicare Appeals Council, and finally federal court. Coverage resets every January, so re-check Kalydeco on your formulary during open enrollment (October 15 – December 7) even if it was covered this year.
Key Facts: Kalydeco Cost
- Medicare Part D avg
- $15,750/claim
- Likely Part D tier
- Tier 4-5 (specialty)
- Annual cost/patient
- $135,000
- Generic available
- Yes — Ivacaftor
- Manufacturer
- Vertex
- Treats
- Cystic Fibrosis
- YoY price change
- -8.4%
Source: CMS Medicare Part D Spending Dashboard. Tier placement inferred from typical formulary norms — confirm with your specific Part D plan.
Kalydeco is manufactured by Vertex and prescribed primarily for Cystic Fibrosis. In the most recent Medicare Part D data, 36,000 claims were filed for 4,200 unique beneficiaries, at an average cost of $15,750 per claim. Average annual cost per beneficiary is $135,000.
Year over year, Medicare spending on Kalydeco has decreased by -8.4%. Because a generic version of Ivacaftor is available, patients can often substitute to reduce out-of-pocket costs. Its patent expires 2023-01-31.
Key Data
| Metric | Value |
|---|---|
| Avg Cost Per Claim | $15,750 |
| Total Medicare Spending | $567.0M |
| Total Claims | 36,000 |
| Beneficiaries | 4,200 |
| Generic Available | Yes |
| Year-Over-Year Change | -8.4% |
Other Drugs for Cystic Fibrosis
Frequently Asked Questions
Yes. Kalydeco appears in Medicare Part D claims data, with 4,200 beneficiaries filling 36,000 prescriptions in the latest year. Whether your specific plan covers it depends on that plan's formulary, so confirm on your plan's Summary of Benefits.
It can. Many Part D plans apply prior authorization, step therapy, or quantity limits to Kalydeco — higher-cost drugs like this one are the most likely to carry these requirements. Prior authorization means your prescriber must document medical necessity before the plan pays. Check your plan's formulary "PA," "ST," or "QL" flags, or ask your pharmacist to run a test claim.
You have appeal rights. Start with a coverage determination / formulary exception request from your plan (your prescriber submits a supporting statement). If denied, you can escalate through five levels: redetermination, an independent review entity, an Administrative Law Judge, the Medicare Appeals Council, and federal court. Expedited 72-hour decisions are available when waiting could jeopardize your health.
Most Medicare Advantage plans include Part D drug coverage (MA-PD), so Kalydeco is generally available — but each Advantage plan sets its own formulary, tier, and pharmacy network. Coverage and copay can differ from Original Medicare plus a standalone Part D plan, so compare the specific plan's drug list before enrolling.
Kalydeco is typically placed on Tier 4-5 (specialty) of standard Part D formularies. Specialty drugs use coinsurance (25-33% of plan-negotiated price), not flat copays. The 2025 Part D annual out-of-pocket cap is $2,000. Your exact tier and cost-sharing are set by your individual plan and can change each plan year.
Use the Medicare Plan Finder at medicare.gov, enter Kalydeco, and review each plan's formulary, tier, and restrictions. You can also call the number on your insurance card or check the plan's online drug lookup. Coverage is reset every January, so re-check during open enrollment (Oct 15 – Dec 7).
More about Kalydeco
Yes — Kalydeco (Ivacaftor) is covered under Medicare Part D, filled by 4,200 beneficiaries across 36,000 claims in the latest year. It typically sits on tier 4-5 (specialty) of standard Part D formularies. Specialty drugs use coinsurance (25-33% of plan-negotiated price), not flat copays. The 2025 Part D annual out-of-pocket cap is $2,000.
The data source behind this answer is CMS Medicare Part D Drug Spending data. Every figure on the page traces back to that source; the methodology page describes the inputs and the refresh cadence in full detail.
For readers turning this answer into action: cross-reference against the underlying CMS Medicare Part D Drug Spending data record before acting on time-sensitive decisions. The site renders the data as it was published; subsequent revisions can shift the picture, and the live federal data is always the authoritative current reference.
Source: CMS Medicare Part D Spending, 2026.