Medicare drug coverage
Synthroid: 2027 Medicare Part D coverage
5,117 of 5,495 Part D plans (93%) list Synthroid on their 2027 formulary, the plan's list of covered drugs (up 1 point from 2026). 0% of those require prior authorization, step therapy, or a quantity limit. Plan counts include both Medicare Advantage plans with drug coverage (5,172 MA-PD) and stand-alone drug plans (323 PDP).
License: a US government work, in the public domain (Public Domain Mark 1.0).
Data only, not plan advice. Confirm on Medicare.gov Plan Finder or 1-800-MEDICARE.
2027 compared with 2026
Synthroid is number 121 by total Medicare Part D spending in 2024 ($348 million). Plans that list it most often put it on tier 3 (a tier is the cost level a plan puts a drug on; a lower tier usually costs less). Counts use 13 RxNorm products for this name.
| Measure | 2026 | 2027 | Change |
|---|---|---|---|
| Part D plans in the file | 5,518 | 5,495 | -23 |
| Plans that list it | 5,093 (92%) | 5,117 (93%) | +1 point |
| Prior authorization (of plans that list it) | 0 (0%) | 0 (0%) | no change |
| Step therapy (of plans that list it) | 0 (0%) | 0 (0%) | no change |
| Quantity limit (of plans that list it) | 0 (0%) | 0 (0%) | no change |
| Any of the three (of plans that list it) | 0 (0%) | 0 (0%) | no change |
| Not listed or restricted (of all plans) | 425 (8%) | 378 (7%) | -1 point |
Source: CMS 2027 Part D formulary file (basic drugs and plan information), as of October 8, 2026. Publisher page
Source: CMS 2026 Part D formulary file (basic drugs and plan information), as of September 30, 2026. Publisher page
For pharmacies and agencies: check a whole drug list against 2027 formularies.
Upload your patient list or your book of clients and Rivvi checks each drug against the CMS 2027 formulary files, plan by plan, so you see tier changes and new limits before the next refill or open enrollment. Free to start. HIPAA BAA included.
Formulary tier
| Tier | 2026 plans | 2027 plans |
|---|---|---|
| Tier 1 | 106 (2%) | 83 (2%) |
| Tier 2 | 459 (9%) | 970 (19%) |
| Tier 3 | 3,882 (76%) | 3,570 (70%) |
| Tier 4 | 646 (13%) | 494 (10%) |
Source: CMS 2027 Part D formulary file (basic drugs and plan information), as of October 8, 2026. Publisher page
Source: CMS 2026 Part D formulary file (basic drugs and plan information), as of September 30, 2026. Publisher page
Plan by plan, 2026 to 2027
4,380 plan IDs are in both files. 0 of them (0%) added prior authorization, step therapy, or a quantity limit for Synthroid, and 13 stopped listing it.
| Plan by plan | Plans |
|---|---|
| Same plan ID in both years | 4,380 |
| Listed it in 2026, not in 2027 | 13 (0%) |
| Listed it in 2027, not in 2026 | 45 (1%) |
| Moved it to a higher tier | 77 (2%) |
| Added prior authorization | 0 (0%) |
| Added step therapy | 0 (0%) |
| Added a quantity limit | 0 (0%) |
| Added at least one of the three | 0 (0%) |
| Removed at least one of the three | 0 (0%) |
| Plan IDs new in 2027 | 1,115 |
| 2026 plan IDs not in the 2027 file | 1,138 |
Source: CMS 2027 Part D formulary file (basic drugs and plan information), as of October 8, 2026. Publisher page
Source: CMS 2026 Part D formulary file (basic drugs and plan information), as of September 30, 2026. Publisher page
States from most to least restrictive
Share of 2027 Part D plans offered in each state that leave Synthroid off the formulary or list it with prior authorization, step therapy, or a quantity limit. Michigan ranks first at 25%, with 0% of its plans using prior authorization or step therapy; 22 states tie for the lowest, 0%. States at the same share are marked Tied and share a rank.
| Rank | State | 2027 plans | Not listed or restricted | Prior auth or step therapy | Change from 2026 |
|---|---|---|---|---|---|
| 1 | Michigan | 183 | 25% | 0% | -1 point |
| 2 | California | 397 | 21% | 0% | -1 point |
| 3 | Maryland | 49 | 20% | 0% | -15 points |
| 4 | Nevada | 100 | 19% | 0% | +5 points |
| 5 | Oregon | 92 | 18% | 0% | no change |
| 6 | Washington | 114 | 16% | 0% | -1 point |
| 7 | Wyoming | 13 | 15% | 0% | +4 points |
| 8 | District of Columbia | 21 | 14% | 0% | +2 points |
| 9 | Ohio | 173 | 13% | 0% | +1 point |
| Tied 10 | Colorado | 106 | 12% | 0% | -4 points |
| Tied 10 | Hawaii | 50 | 12% | 0% | -5 points |
| Tied 12 | Arizona | 148 | 9% | 0% | +2 points |
| Tied 12 | West Virginia | 70 | 9% | 0% | -1 point |
| Tied 14 | Missouri | 171 | 8% | 0% | no change |
| Tied 14 | Illinois | 133 | 8% | 0% | +1 point |
| 16 | Oklahoma | 81 | 7% | 0% | no change |
| Tied 17 | Indiana | 140 | 6% | 0% | -1 point |
| Tied 17 | New York | 215 | 6% | 0% | no change |
| Tied 17 | North Carolina | 177 | 6% | 0% | +4 points |
| Tied 17 | Texas | 412 | 6% | 0% | +1 point |
| Tied 21 | Georgia | 151 | 5% | 0% | -1 point |
| Tied 21 | Arkansas | 86 | 5% | 0% | +1 point |
| 23 | Virginia | 145 | 4% | 0% | no change |
| Tied 24 | Kentucky | 123 | 3% | 0% | -1 point |
| Tied 24 | Minnesota | 63 | 3% | 0% | no change |
| Tied 24 | Wisconsin | 97 | 3% | 0% | -1 point |
| Tied 24 | Florida | 549 | 3% | 0% | -2 points |
| Tied 28 | Tennessee | 157 | 1% | 0% | no change |
| Tied 28 | Pennsylvania | 324 | 1% | 0% | no change |
| Tied 30 | Alaska | 9 | 0% | 0% | no change |
| Tied 30 | Alabama | 115 | 0% | 0% | no change |
| Tied 30 | Connecticut | 54 | 0% | 0% | no change |
| Tied 30 | Delaware | 43 | 0% | 0% | no change |
| Tied 30 | Iowa | 64 | 0% | 0% | no change |
| Tied 30 | Idaho | 45 | 0% | 0% | no change |
| Tied 30 | Kansas | 84 | 0% | 0% | no change |
| Tied 30 | Louisiana | 126 | 0% | 0% | no change |
| Tied 30 | Massachusetts | 92 | 0% | 0% | no change |
| Tied 30 | Maine | 52 | 0% | 0% | no change |
| Tied 30 | Mississippi | 105 | 0% | 0% | no change |
| Tied 30 | Montana | 27 | 0% | 0% | no change |
| Tied 30 | North Dakota | 26 | 0% | 0% | -6 points |
| Tied 30 | Nebraska | 51 | 0% | 0% | no change |
| Tied 30 | New Hampshire | 25 | 0% | 0% | -16 points |
| Tied 30 | New Jersey | 74 | 0% | 0% | -2 points |
| Tied 30 | New Mexico | 68 | 0% | 0% | no change |
| Tied 30 | Rhode Island | 29 | 0% | 0% | no change |
| Tied 30 | South Carolina | 91 | 0% | 0% | -4 points |
| Tied 30 | South Dakota | 30 | 0% | 0% | no change |
| Tied 30 | Utah | 53 | 0% | 0% | no change |
| Tied 30 | Vermont | 14 | 0% | 0% | no change |
Source: CMS CY2027 landscape file (states and parent organizations), as of September 30, 2026. Publisher page
Source: CMS 2027 Part D formulary file (basic drugs and plan information), as of October 8, 2026. Publisher page
By parent organization
164 parent organizations offer 2027 Part D plans. Humana Inc. has the most, 884, and 0% of them leave Synthroid off or restrict it.
| Parent organization | 2027 plans ↑ | List it | Restrict it (of listing) | Not listed or restricted | Change from 2026 | Plans that added a restriction |
|---|---|---|---|---|---|---|
| BrightSpring Health Services, Inc. | 2 | 0% | none list it | 100% | no change | 0 |
| Community Health Group | 2 | 0% | none list it | 100% | no change | 0 |
| Community Health Plan of Washington | 2 | 0% | none list it | 100% | no change | 0 |
| Denver Health and Hospital Authority | 2 | 0% | none list it | 100% | no change | 0 |
| Elevance Health, Inc. & BCBSMA & BCBSRI & BCBSVT | 2 | 100% | 0% | 0% | no change | 0 |
| Elite Health Systems, Inc. | 2 | 0% | none list it | 100% | no change | 0 |
| Group Health Cooperative of Eau Claire | 2 | 0% | none list it | 100% | no change | 0 |
| Hamaspik of Rockland County, Inc. | 2 | 0% | none list it | 100% | +100 points | 0 |
| ISNP Holdings, LLC | 2 | 100% | 0% | 0% | no change | 0 |
| Kansas Superior Select | 2 | 100% | 0% | 0% | no change | 0 |
| Missouri Healthcare Advisors, LLC | 2 | 100% | 0% | 0% | no change | 0 |
| MultiCare Health Systems | 2 | 100% | 0% | 0% | new in 2027 | 0 |
| NEIGHBORHOOD HEALTH PLAN OF RHODE ISLAND | 2 | 100% | 0% | 0% | no change | 0 |
| PrimeWest Rural MN Health Care Access Initiative | 2 | 0% | none list it | 100% | no change | 0 |
| Regency ISNP Holdings LLC | 2 | 0% | none list it | 100% | no change | 0 |
| Select Founders, LLC | 2 | 0% | none list it | 100% | no change | 0 |
| Sentara Health Care (SHC) | 2 | 100% | 0% | 0% | no change | 0 |
| South Country Health Alliance | 2 | 100% | 0% | 0% | no change | 0 |
| The Regents of the University of California | 2 | 0% | none list it | 100% | no change | 0 |
| Troy Holdings, Inc. | 2 | 0% | none list it | 100% | +100 points | 0 |
| Associated Care Ventures, Inc. | 3 | 100% | 0% | 0% | no change | 0 |
| Aultman Health Foundation | 3 | 100% | 0% | 0% | no change | 0 |
| Banner Health | 3 | 0% | none list it | 100% | no change | 0 |
| Bexar County Hospital District | 3 | 100% | 0% | 0% | no change | 0 |
| Blue Cross Blue Shield of Nebraska | 3 | 100% | 0% | 0% | no change | 0 |
Source: CMS CY2027 landscape file (states and parent organizations), as of September 30, 2026. Publisher page
Source: CMS 2027 Part D formulary file (basic drugs and plan information), as of October 8, 2026. Publisher page
Other Levothyroxine Sodium products
Near it by Part D spending
About this data
A plan here is one Part D plan as the CMS formulary files list it: contract, plan, and segment. That covers Medicare Advantage plans with drug coverage and stand-alone drug plans. A plan lists a drug when its formulary has a row for any RxNorm product of that name. When it has several, the row with the lowest tier is the one counted, and restricted means that row has prior authorization, step therapy, or a quantity limit.
A plan with no row for the drug counts as not listing it. That can be a product the file codes another way, so read a low count as a lookup result, not a coverage decision. A state counts every plan the CMS landscape file offers there. Parent organizations are named as CMS names them. The drug list is the top 200 by total Part D spending.
Source: CMS 2027 Part D formulary file (basic drugs and plan information), as of October 8, 2026. Publisher page
Source: CMS CY2027 landscape file (states and parent organizations), as of September 30, 2026. Publisher page
Source: CMS Medicare Part D Spending by Drug, 2024 data, as of June 25, 2026. Publisher page