Buprenorphine (Belbuca, BuTrans) — 2026 Medicare Part D coverage
buprenorphine — sold as Belbuca, BuTrans: 19 forms appear in Medicare Part D formularies for 2026. This page reports what plans filed with CMS; it does not recommend a plan.
Which plans in your county cover buprenorphine?
Pick a county to see every Medicare Advantage plan filed there and every stand-alone Part D plan in its region, with this drug's tier, restrictions and tier cost sharing.
How to read drug coverage
Tier is the cost-sharing tier the plan assigned the drug in its CMS formulary filing; lower tiers usually cost less. PA = prior authorization, ST = step therapy (try another drug first), QL = quantity limit. Not on formulary means the plan did not list this exact form; the plan may cover another strength or a formulary exception may be possible. Cost sharing is the plan's initial-coverage amount for the tier as filed with CMS; the deductible, the $2,100 annual out-of-pocket cap, the $35 insulin cap and negotiated prices for selected drugs can change what you actually pay. Formularies change during the year; the plan's formulary document and Medicare.gov govern.
What the star rating under each Medicare Advantage plan means
What the star rating means. CMS rates every Medicare Advantage contract (the "H" number in the plan ID — all plans under it share the rating) on a 1-to-5 scale each October, from about 40 measures of care quality, member experience, complaints and appeals, customer service and, for plans with drug coverage, drug safety and pricing. The 2026 rating is largely based on performance measured in 2024.
5 Excellent4 Above average3 Average2 Below average1 Poor
Not rated means CMS published no overall rating — usually a contract too new to be measured or with too few members ("not enough data"); it is not a low score. A 5-star contract can be joined outside the normal enrollment windows (the 5-star Special Enrollment Period, Dec 8 – Nov 30). Medicare.gov flags contracts rated below 3 stars for three years running as low-performing. Stars describe the contract's past performance as CMS measured it; they are not a recommendation, and they do not tell you whether a plan's network, drugs or costs fit you.
Forms and strengths in 2026 formularies
| Form | Formularies listing it | Most common tier | PA | ST | QL |
|---|---|---|---|---|---|
| buprenorphine HCl 2 MG Sublingual Tablet generic · RxCUI 351264 | 328 (100%) | 2 | 0 | 0 | 168 |
| buprenorphine HCl 8 MG Sublingual Tablet generic · RxCUI 351265 | 328 (100%) | 2 | 0 | 0 | 169 |
| buprenorphine 10 MCG/HR 7 Day Transdermal System generic · RxCUI 904870 | 227 (69%) | 4 | 79 | 0 | 221 |
| buprenorphine 15 MCG/HR 7 Day Transdermal System generic · RxCUI 1432969 | 227 (69%) | 4 | 79 | 0 | 222 |
| buprenorphine 20 MCG/HR 7 Day Transdermal System generic · RxCUI 904876 | 227 (69%) | 4 | 79 | 0 | 219 |
| buprenorphine 5 MCG/HR 7 Day Transdermal System generic · RxCUI 904880 | 227 (69%) | 4 | 79 | 0 | 221 |
| buprenorphine 7.5 MCG/HR 7 Day Transdermal System generic · RxCUI 1542997 | 227 (69%) | 4 | 79 | 0 | 222 |
| Belbuca 150 MCG Buccal Film brand · RxCUI 1716063 | 40 (12%) | 3 | 33 | 0 | 39 |
| Belbuca 300 MCG Buccal Film brand · RxCUI 1716067 | 40 (12%) | 3 | 33 | 0 | 39 |
| Belbuca 450 MCG Buccal Film brand · RxCUI 1716071 | 40 (12%) | 3 | 33 | 0 | 39 |
| Belbuca 600 MCG Buccal Film brand · RxCUI 1716075 | 40 (12%) | 3 | 33 | 0 | 36 |
| Belbuca 75 MCG Buccal Film brand · RxCUI 1716079 | 40 (12%) | 3 | 33 | 0 | 39 |
| Belbuca 750 MCG Buccal Film brand · RxCUI 1716083 | 40 (12%) | 3 | 33 | 0 | 36 |
| Belbuca 900 MCG Buccal Film brand · RxCUI 1716090 | 40 (12%) | 3 | 33 | 0 | 36 |
| Butrans 10 MCG/HR 7 Day Transdermal System brand · RxCUI 904874 | 1 (0%) | 1 | 1 | 0 | 1 |
| Butrans 15 MCG/HR 7 Day Transdermal System brand · RxCUI 1432971 | 1 (0%) | 1 | 1 | 0 | 1 |
| Butrans 20 MCG/HR 7 Day Transdermal System brand · RxCUI 904878 | 1 (0%) | 1 | 1 | 0 | 1 |
| Butrans 5 MCG/HR 7 Day Transdermal System brand · RxCUI 904882 | 1 (0%) | 1 | 1 | 0 | 1 |
| Butrans 7.5 MCG/HR 7 Day Transdermal System brand · RxCUI 1542999 | 1 (0%) | 1 | 1 | 0 | 1 |
Counts are formularies (of 328) in the CMS file that list the form, and how many of those apply prior authorization (PA), step therapy (ST) or a quantity limit (QL). Many plans share one formulary, so plan counts in a county will differ.
How to read drug coverage
Tier is the cost-sharing tier the plan assigned the drug in its CMS formulary filing; lower tiers usually cost less. PA = prior authorization, ST = step therapy (try another drug first), QL = quantity limit. Not on formulary means the plan did not list this exact form; the plan may cover another strength or a formulary exception may be possible. Cost sharing is the plan's initial-coverage amount for the tier as filed with CMS; the deductible, the $2,100 annual out-of-pocket cap, the $35 insulin cap and negotiated prices for selected drugs can change what you actually pay. Formularies change during the year; the plan's formulary document and Medicare.gov govern.
What the star rating under each Medicare Advantage plan means
What the star rating means. CMS rates every Medicare Advantage contract (the "H" number in the plan ID — all plans under it share the rating) on a 1-to-5 scale each October, from about 40 measures of care quality, member experience, complaints and appeals, customer service and, for plans with drug coverage, drug safety and pricing. The 2026 rating is largely based on performance measured in 2024.
5 Excellent4 Above average3 Average2 Below average1 Poor
Not rated means CMS published no overall rating — usually a contract too new to be measured or with too few members ("not enough data"); it is not a low score. A 5-star contract can be joined outside the normal enrollment windows (the 5-star Special Enrollment Period, Dec 8 – Nov 30). Medicare.gov flags contracts rated below 3 stars for three years running as low-performing. Stars describe the contract's past performance as CMS measured it; they are not a recommendation, and they do not tell you whether a plan's network, drugs or costs fit you.