Diltiazem (Cardizem, Cartia, Dilt) — 2026 Medicare Part D coverage
diltiazem — sold as Cardizem, Cartia, Dilt, Matzim, Tiadylt, Tiazac: 57 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 diltiazem?
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 |
|---|---|---|---|---|---|
| dilTIAZem HCl 120 MG 24HR Extended Release Oral Capsule generic · RxCUI 830861 | 328 (100%) | 2 | 0 | 0 | 0 |
| dilTIAZem HCl 180 MG 24HR Extended Release Oral Capsule generic · RxCUI 830845 | 328 (100%) | 2 | 0 | 0 | 0 |
| dilTIAZem HCl 240 MG 24HR Extended Release Oral Capsule generic · RxCUI 830837 | 328 (100%) | 2 | 0 | 0 | 0 |
| dilTIAZem HCl 90 MG Oral Tablet generic · RxCUI 831102 | 328 (100%) | 2 | 0 | 0 | 0 |
| dilTIAZem hydrochloride 120 MG Oral Tablet generic · RxCUI 831054 | 328 (100%) | 2 | 0 | 0 | 0 |
| dilTIAZem hydrochloride 30 MG Oral Tablet generic · RxCUI 833217 | 328 (100%) | 2 | 0 | 0 | 0 |
| dilTIAZem hydrochloride 300 MG 24HR Extended Release Oral Capsule generic · RxCUI 830801 | 328 (100%) | 2 | 0 | 0 | 0 |
| dilTIAZem hydrochloride 60 MG Oral Tablet generic · RxCUI 831103 | 328 (100%) | 2 | 0 | 0 | 0 |
| dilTIAZem hydrochloride 420 MG 24HR Extended Release Oral Capsule generic · RxCUI 831359 | 325 (99%) | 2 | 0 | 0 | 0 |
| Cartia XT 120 MG 24HR Extended Release Oral Capsule, Once-A-Day brand · RxCUI 831226 | 324 (99%) | 2 | 0 | 0 | 0 |
| Cartia XT 180 MG 24HR Extended Release Oral Capsule, Once-A-Day brand · RxCUI 831255 | 324 (99%) | 2 | 0 | 0 | 0 |
| Cartia XT 240 MG 24HR Extended Release Oral Capsule, Once-A-Day brand · RxCUI 831309 | 324 (99%) | 2 | 0 | 0 | 0 |
| Cartia XT 300 MG 24HR Extended Release Oral Capsule, Once-A-Day brand · RxCUI 831338 | 324 (99%) | 2 | 0 | 0 | 0 |
| DILT-CD 120 MG 24HR Extended Release Oral Capsule brand · RxCUI 831215 | 324 (99%) | 2 | 0 | 0 | 0 |
| DILT-CD 180 MG 24HR Extended Release Oral Capsule brand · RxCUI 831252 | 324 (99%) | 2 | 0 | 0 | 0 |
| DILT-CD 240 MG 24HR Extended Release Oral Capsule brand · RxCUI 831285 | 324 (99%) | 2 | 0 | 0 | 0 |
| dilTIAZem hydrochloride 360 MG 24HR Extended Release Oral Capsule generic · RxCUI 830795 | 320 (98%) | 2 | 0 | 0 | 0 |
| TIADYLT ER 120 MG 24HR Oral Capsule brand · RxCUI 1988308 | 308 (94%) | 2 | 0 | 0 | 0 |
| TIADYLT ER 180 MG 24HR Oral Capsule brand · RxCUI 1988311 | 308 (94%) | 2 | 0 | 0 | 0 |
| TIADYLT ER 240 MG 24HR Oral Capsule brand · RxCUI 1988316 | 308 (94%) | 2 | 0 | 0 | 0 |
| TIADYLT ER 300 MG 24HR Oral Capsule brand · RxCUI 1988319 | 308 (94%) | 2 | 0 | 0 | 0 |
| TIADYLT ER 360 MG 24HR Extended Release Oral Capsule brand · RxCUI 1988324 | 308 (94%) | 2 | 0 | 0 | 0 |
| TIADYLT ER 420 MG 24HR Oral Capsule brand · RxCUI 1988330 | 307 (94%) | 2 | 0 | 0 | 0 |
| dilTIAZem hydrochloride 120 MG 12HR Extended Release Oral Capsule generic · RxCUI 830872 | 290 (88%) | 2 | 0 | 0 | 1 |
| dilTIAZem hydrochloride 60 MG 12HR Extended Release Oral Capsule generic · RxCUI 830865 | 290 (88%) | 2 | 0 | 0 | 1 |
| dilTIAZem hydrochloride 90 MG 12HR Extended Release Oral Capsule generic · RxCUI 830869 | 290 (88%) | 2 | 0 | 0 | 1 |
| dilTIAZem hydrochloride 240 MG 24HR Extended Release Oral Tablet generic · RxCUI 830879 | 145 (44%) | 2 | 0 | 0 | 0 |
| dilTIAZem hydrochloride 300 MG 24HR Extended Release Oral Tablet generic · RxCUI 830882 | 145 (44%) | 2 | 0 | 0 | 0 |
| dilTIAZem hydrochloride 360 MG 24HR Extended Release Oral Tablet generic · RxCUI 830897 | 145 (44%) | 2 | 0 | 0 | 0 |
| dilTIAZem hydrochloride 120 MG 24HR Extended Release Oral Tablet generic · RxCUI 830874 | 143 (44%) | 2 | 0 | 0 | 0 |
| dilTIAZem hydrochloride 180 MG 24HR Extended Release Oral Tablet generic · RxCUI 830877 | 138 (42%) | 2 | 0 | 0 | 0 |
| dilTIAZem hydrochloride 420 MG 24HR Extended Release Oral Tablet generic · RxCUI 830900 | 138 (42%) | 2 | 0 | 0 | 0 |
| Matzim LA 180 MG 24HR Extended Release Oral Tablet brand · RxCUI 1091632 | 132 (40%) | 2 | 0 | 0 | 0 |
| Matzim LA 240 MG 24HR Extended Release Oral Tablet brand · RxCUI 1091629 | 132 (40%) | 2 | 0 | 0 | 0 |
| Matzim LA 300 MG 24HR Extended Release Oral Tablet brand · RxCUI 1091635 | 132 (40%) | 2 | 0 | 0 | 0 |
| Matzim LA 360 MG 24HR Extended Release Oral Tablet brand · RxCUI 1091638 | 132 (40%) | 2 | 0 | 0 | 0 |
| Matzim LA 420 MG 24HR Extended Release Oral Tablet brand · RxCUI 1091623 | 132 (40%) | 2 | 0 | 0 | 0 |
| CARDIZEM LA 120 MG 24HR Extended Release Oral Tablet brand · RxCUI 830876 | 1 (0%) | 1 | 0 | 0 | 0 |
| CARDIZEM LA 180 MG 24HR Extended Release Oral Tablet brand · RxCUI 830878 | 1 (0%) | 1 | 0 | 0 | 0 |
| CARDIZEM LA 240 MG 24HR Extended Release Oral Tablet brand · RxCUI 830880 | 1 (0%) | 1 | 0 | 0 | 0 |
| CARDIZEM LA 300 MG 24HR Extended Release Oral Tablet brand · RxCUI 830883 | 1 (0%) | 1 | 0 | 0 | 0 |
| CARDIZEM LA 360 MG 24HR Extended Release Oral Tablet brand · RxCUI 830898 | 1 (0%) | 1 | 0 | 0 | 0 |
| CARDIZEM LA 420 MG 24HR Extended Release Oral Tablet brand · RxCUI 830902 | 1 (0%) | 1 | 0 | 0 | 0 |
| Cardizem 120 MG Oral Tablet brand · RxCUI 831055 | 1 (0%) | 1 | 0 | 0 | 0 |
| Cardizem 30 MG Oral Tablet brand · RxCUI 833219 | 1 (0%) | 1 | 0 | 0 | 0 |
| Cardizem 60 MG Oral Tablet brand · RxCUI 834393 | 1 (0%) | 1 | 0 | 0 | 0 |
| Cardizem CD 120 MG 24HR Extended Release Oral Capsule brand · RxCUI 830863 | 1 (0%) | 1 | 0 | 0 | 0 |
| Cardizem CD 180 MG 24HR Extended Release Oral Capsule brand · RxCUI 830847 | 1 (0%) | 1 | 0 | 0 | 0 |
| Cardizem CD 240 MG 24HR Extended Release Oral Capsule brand · RxCUI 830839 | 1 (0%) | 1 | 0 | 0 | 0 |
| Cardizem CD 300 MG 24HR Extended Release Oral Capsule brand · RxCUI 830803 | 1 (0%) | 1 | 0 | 0 | 0 |
| Cardizem CD 360 MG 24HR Extended Release Oral Capsule brand · RxCUI 830798 | 1 (0%) | 1 | 0 | 0 | 0 |
| Tiazac 120 MG 24HR Extended Release Oral Capsule brand · RxCUI 831193 | 1 (0%) | 1 | 0 | 0 | 0 |
| Tiazac 180 MG 24HR Extended Release Oral Capsule brand · RxCUI 831244 | 1 (0%) | 1 | 0 | 0 | 0 |
| Tiazac 240 MG 24HR Extended Release Oral Capsule brand · RxCUI 831296 | 1 (0%) | 1 | 0 | 0 | 0 |
| Tiazac 300 MG 24HR Extended Release Oral Capsule brand · RxCUI 831323 | 1 (0%) | 1 | 0 | 0 | 0 |
| Tiazac 360 MG 24HR Extended Release Oral Capsule brand · RxCUI 831347 | 1 (0%) | 1 | 0 | 0 | 0 |
| Tiazac 420 MG 24HR Extended Release Oral Capsule brand · RxCUI 831360 | 1 (0%) | 1 | 0 | 0 | 0 |
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.