Does Medicare Part D cover Synthroid?
Coverage, cost, and 2026 details for Synthroid (levothyroxine) under Medicare Part D.
Quick answer: Yes, Synthroid is generally covered by Medicare Part D plans, typically on Tier 1 (generic levothyroxine). Coverage details, copays, and restrictions vary by plan, so compare plans available in your area to find the best coverage for your medications.
What is Synthroid?
Synthroid (levothyroxine) is the most prescribed thyroid medication, used as hormone replacement therapy for hypothyroidism. Generic levothyroxine is therapeutically equivalent and significantly cheaper. Some patients respond differently to brand vs. generic and should stay on whichever version their doctor prescribes.
Is Synthroid covered by Medicare Part D?
Generic levothyroxine is covered by every Medicare Part D plan on Tier 1 (preferred generic). It's one of the cheapest medications on Medicare. If your doctor specifies brand-name Synthroid (sometimes done for consistency in dosing), it's typically Tier 3.
Typical formulary tier
Synthroid is most often listed on Tier 1 (generic levothyroxine) of Part D formularies. The exact tier — and the copay — depends on the specific plan you're enrolled in.
How much does Synthroid cost with Medicare Part D?
Without insurance, Synthroid costs $10 to $20 per month for generic at retail pharmacies. With Medicare Part D coverage, you typically pay Typically $0 to $10 per month for generic levothyroxine; $20 to $80 for brand Synthroid.
Your actual cost depends on:
- Your plan's deductible — up to $615 in 2026
- The tier Synthroid is on in your plan's formulary
- Whether you've reached the $2,100 annual out-of-pocket cap
- Whether you qualify for Extra Help (Low-Income Subsidy)
- Whether you've enrolled in the Medicare Prescription Payment Plan (M3P), which spreads costs across the year
How to lower your Synthroid costs
1. Compare Part D plans for your specific drugs
The same drug can cost dramatically different amounts on different plans. During the Annual Enrollment Period (October 15 – December 7), use the Medicare.gov Plan Finder to compare what Synthroid would cost across every plan available in your ZIP code.
2. Check if you qualify for Extra Help
If your income is below approximately $23,475 (single) or $31,725 (married couple) in 2026, you likely qualify for Extra Help, which dramatically reduces what you pay for Synthroid and all your medications. Learn about Extra Help →
3. Use the Medicare Prescription Payment Plan (M3P)
M3P doesn't lower your total cost, but it spreads your annual out-of-pocket costs into monthly installments — which can help if Synthroid causes a big upfront pharmacy bill. Learn about M3P →
4. Look into Patient Assistance Programs
AbbVie (brand) / various (generic) may offer a Patient Assistance Program for people with limited income who don't qualify for Extra Help. These programs can provide free or deeply discounted medication directly from the manufacturer. Learn more about manufacturer programs →
5. Ask about alternatives
Talk to your doctor about whether a different medication — including a generic version or a similar drug in the same class — would work for you.
Alternatives to Synthroid
Other medications used for hypothyroidism, thyroid hormone replacement include:
- Levoxyl (brand levothyroxine)
- Tirosint (gel cap formulation)
- Cytomel (liothyronine — different thyroid hormone)
- Armour Thyroid (natural desiccated thyroid)
Always discuss any medication change with your prescribing doctor.
Key facts about Synthroid on Medicare
- Generic levothyroxine is typically $0–$10/month
- Stay on the same brand or generic version once stable
- One of the most prescribed medications in the U.S.
Frequently asked questions about Synthroid on Medicare
Does Medicare cover Synthroid?
Yes, Synthroid is generally covered by Medicare Part D plans, most often on Tier 1 (generic levothyroxine). Coverage and costs vary between plans, so compare plans available in your area. Some plans require prior authorization.
How much does Synthroid cost on Medicare Part D?
Costs typically range from Typically $0 to $10 per month for generic levothyroxine; $20 to $80 for brand Synthroid. Your actual cost depends on your plan's deductible, the tier Synthroid is on, and whether you've reached the $2,100 annual out-of-pocket cap.
Is there a generic version of Synthroid?
Yes — generic versions are available and significantly cheaper. Most Part D plans cover the generic on a lower tier with lower copays.
What if my Part D plan doesn't cover this drug?
You have several options: (1) Switch to a different Part D plan during Annual Enrollment that covers Synthroid, (2) Request a formulary exception from your current plan with your prescriber's support, (3) Ask your doctor about a covered alternative medication, or (4) Look into the manufacturer's Patient Assistance Program if you have limited income.
Compare your Part D options
Coverage and costs for this drug vary significantly between plans. Compare your options:
You can also visit Medicare.gov or call 1-800-MEDICARE