Medicare drug coverage
Gabapentin: 2027 Medicare Part D coverage
5,495 of 5,495 Part D plans (100%) list gabapentin on their 2027 formulary, the same share as 2026. 78% of those require prior authorization, step therapy, or a quantity limit.
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2027 compared with 2026
Gabapentin is number 91 by total Medicare Part D spending in 2024 ($544 million). Plans that list it most often put it on tier 2. Counts use 35 RxNorm products for this name.
| Measure | 2026 | 2027 | Change |
|---|---|---|---|
| Part D plans in the file | 5,518 | 5,495 | -23 |
| Plans that list it | 5,517 (100%) | 5,495 (100%) | no change |
| Prior authorization (of plans that list it) | 17 (0%) | 7 (0%) | no change |
| Step therapy (of plans that list it) | 0 (0%) | 0 (0%) | no change |
| Quantity limit (of plans that list it) | 4,258 (77%) | 4,264 (78%) | no change |
| Any of the three (of plans that list it) | 4,258 (77%) | 4,264 (78%) | no change |
| Not listed or restricted (of all plans) | 4,259 (77%) | 4,264 (78%) | no change |
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
Formulary tier
| Tier | 2026 plans | 2027 plans |
|---|---|---|
| Tier 1 | 805 (15%) | 888 (16%) |
| Tier 2 | 3,940 (71%) | 3,889 (71%) |
| Tier 3 | 740 (13%) | 688 (13%) |
| Tier 4 | 32 (1%) | 30 (1%) |
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. 11 of them (0%) added prior authorization, step therapy, or a quantity limit for gabapentin, and 0 stopped listing it.
| Plan by plan | Plans |
|---|---|
| Same plan id in both years | 4,380 |
| Listed it in 2026, not in 2027 | 0 (0%) |
| Listed it in 2027, not in 2026 | 0 (0%) |
| Moved it to a higher tier | 44 (1%) |
| Added prior authorization | 3 (0%) |
| Added step therapy | 0 (0%) |
| Added a quantity limit | 8 (0%) |
| Added at least one of the three | 11 (0%) |
| Removed at least one of the three | 12 (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 gabapentin off the formulary or list it with prior authorization, step therapy, or a quantity limit. Florida ranks first at 90%, with 0% of its plans using prior authorization or step therapy; New Mexico ranks last at 51%. Ties break on the prior authorization or step therapy share.
| Rank | State | 2027 plans | Not listed or restricted | Prior auth or step therapy | Change from 2026 |
|---|---|---|---|---|---|
| 1 | Florida | 549 | 90% | 0% | +1 point |
| 2 | Pennsylvania | 324 | 89% | 0% | no change |
| 3 | South Carolina | 91 | 87% | 0% | no change |
| 4 | South Dakota | 30 | 87% | 0% | no change |
| 5 | Alabama | 115 | 86% | 0% | no change |
| 6 | Minnesota | 63 | 86% | 0% | -1 point |
| 7 | Vermont | 14 | 86% | 0% | +1 point |
| 8 | Montana | 27 | 85% | 0% | +7 points |
| 9 | Wyoming | 13 | 85% | 0% | +16 points |
| 10 | West Virginia | 70 | 84% | 0% | -3 points |
| 11 | Illinois | 133 | 84% | 0% | no change |
| 12 | Tennessee | 157 | 84% | 0% | -2 points |
| 13 | New Jersey | 74 | 84% | 0% | +3 points |
| 14 | Arkansas | 86 | 84% | 0% | +2 points |
| 15 | North Carolina | 177 | 84% | 0% | +3 points |
| 16 | Indiana | 140 | 84% | 0% | +3 points |
| 17 | Connecticut | 54 | 83% | 0% | +4 points |
| 18 | Missouri | 171 | 83% | 0% | +3 points |
| 19 | Nebraska | 51 | 82% | 0% | -1 point |
| 20 | Kansas | 84 | 82% | 0% | +5 points |
| 21 | Mississippi | 105 | 82% | 0% | -5 points |
| 22 | Louisiana | 126 | 82% | 0% | -2 points |
| 23 | Oregon | 92 | 82% | 0% | +12 points |
| 24 | Ohio | 173 | 82% | 1% | +1 point |
| 25 | Kentucky | 123 | 81% | 0% | no change |
| 26 | Arizona | 148 | 81% | 1% | +2 points |
| 27 | Georgia | 151 | 81% | 0% | -1 point |
| 28 | Texas | 412 | 80% | 0% | +2 points |
| 29 | Iowa | 64 | 80% | 0% | -2 points |
| 30 | Delaware | 43 | 79% | 0% | no change |
| 31 | Alaska | 9 | 78% | 0% | no change |
| 32 | Maine | 52 | 77% | 0% | +3 points |
| 33 | North Dakota | 26 | 77% | 0% | -2 points |
| 34 | Oklahoma | 81 | 75% | 0% | -5 points |
| 35 | Nevada | 100 | 73% | 0% | -6 points |
| 36 | Hawaii | 50 | 72% | 0% | +3 points |
| 37 | New Hampshire | 25 | 72% | 0% | +8 points |
| 38 | Utah | 53 | 72% | 0% | -2 points |
| 39 | Virginia | 145 | 70% | 0% | +4 points |
| 40 | New York | 215 | 70% | 1% | no change |
| 41 | Colorado | 106 | 69% | 0% | +8 points |
| 42 | Wisconsin | 97 | 68% | 0% | no change |
| 43 | Maryland | 49 | 67% | 0% | +2 points |
| 44 | Michigan | 183 | 64% | 0% | +1 point |
| 45 | Idaho | 45 | 64% | 0% | no change |
| 46 | Washington | 114 | 63% | 0% | +7 points |
| 47 | Massachusetts | 92 | 63% | 2% | +3 points |
| 48 | Rhode Island | 29 | 62% | 0% | +1 point |
| 49 | California | 397 | 61% | 0% | -3 points |
| 50 | District of Columbia | 21 | 52% | 0% | -8 points |
| 51 | New Mexico | 68 | 51% | 0% | -6 points |
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 100% of them leave gabapentin 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 |
|---|---|---|---|---|---|---|
| AIDS Healthcare Foundation | 1 | 100% | 100% | 100% | no change | 0 |
| Alameda Alliance for Health | 1 | 100% | 100% | 100% | no change | 0 |
| AllCare Health, Inc. | 1 | 100% | 100% | 100% | no change | 0 |
| AlohaCare | 1 | 100% | 100% | 100% | no change | 0 |
| BCBS MN, MT, NE, ND, WY, Wellmark IA and SD | 1 | 100% | 100% | 100% | no change | 0 |
| CareOregon, Inc. | 1 | 100% | 0% | 0% | no change | 0 |
| Contra Costa Health Services | 1 | 100% | 100% | 100% | no change | 0 |
| DLP Marquette Health Plan, LLC | 1 | 100% | 100% | 100% | no change | 0 |
| Health Plan of San Mateo | 1 | 100% | 100% | 100% | no change | 0 |
| IMPERIAL COUNTY LOCAL HEALTH AUTHORITY | 1 | 100% | 100% | 100% | no change | 0 |
| INLAND EMPIRE HEALTH PLAN | 1 | 100% | 100% | 100% | no change | 0 |
| Itasca County | 1 | 100% | 100% | 100% | no change | 0 |
| Kern Health Systems (KHS) | 1 | 100% | 100% | 100% | no change | 0 |
| Local Initiative Health Authority for LA County | 1 | 100% | 100% | 100% | no change | 0 |
| Muscogee Creek Nation | 1 | 100% | 100% | 100% | new in 2027 | 0 |
| Orange County Health Authority | 1 | 100% | 100% | 100% | no change | 0 |
| SAN FRANCISCO HEALTH AUTHORITY | 1 | 100% | 100% | 100% | no change | 0 |
| SAN JOAQUIN COUNTY HEALTH COMMISSION | 1 | 100% | 100% | 100% | no change | 0 |
| SANTA BARBARA SAN LUIS OBISPO REGIONAL HEALTH AUTH | 1 | 100% | 100% | 100% | no change | 0 |
| SANTA CLARA COUNTY HEALTH AUTHORITY | 1 | 100% | 100% | 100% | no change | 0 |
| SANTA CRUZ MONTEREY MERCED SAN BENITO MARIPOSA MAN | 1 | 100% | 100% | 100% | no change | 0 |
| Samaritan Health Services, Inc. | 1 | 100% | 100% | 100% | no change | 0 |
| The Schroer Group, Inc. | 1 | 100% | 0% | 0% | no change | 0 |
| Ventura County Medi-Cal Managed Care Commission | 1 | 100% | 100% | 100% | no change | 0 |
| BayCare Health System, Inc. | 2 | 100% | 100% | 100% | 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
Run it in Rivvi
Which 2027 plans near you dropped or restricted gabapentin?
Tier changes and new prior auth, step therapy or quantity limits, plan by plan, before open enrollment.
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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