Medicare Part D coverage · cilastatin · RxCUI 1726216
cilastatin 500 MG / imipenem 500 MG Injection [Primaxin]
Per the CMS 2026 Part D formulary file, cilastatin 500 MG / imipenem 500 MG Injection [Primaxin] is covered by 15 Medicare Part D plans (0.3% of enrollable products), averaging Tier 3.5, with prior authorization required on 0% of covering formularies.
- 0.3%
- Plan coverage
- 15
- Plans covering
- T3.5
- Avg tier
- 0%
- Prior auth required
What the CMS Formulary Data Shows for cilastatin 500 MG / imipenem 500 MG Injection [Primaxin]
Per the CMS 2026 Part D formulary file, cilastatin 500 MG / imipenem 500 MG Injection [Primaxin] (RxNorm concept RXCUI 1726216, generic name cilastatin) appears on 11 distinct formulary files spanning 15 Medicare Part D plan offerings - 0.3% of enrollable Part D products, selective placement; verify formulary inclusion before enrolling. Tier placement ranges from Tier 1 to Tier 4, with a cross-plan average of Tier 3.5.
Real-world access to cilastatin 500 MG / imipenem 500 MG Injection [Primaxin] depends on utilization management as much as tier placement: 0% of covering formularies require prior authorization. 0% require step therapy. 0% apply quantity limits.
Historical spending context from the CMS Medicare Part D Drug Spending Dashboard shows 22 Part D beneficiaries filled cilastatin 500 MG / imipenem 500 MG Injection [Primaxin] in 2023, with total plan-and-beneficiary spending of $21,562 and an average per-beneficiary annual cost of $980.11. The plan-by-plan detail below lists exactly which PDP and MA-PD contracts carry cilastatin 500 MG / imipenem 500 MG Injection [Primaxin] today.
Coverage Details
- Formularies covering
- 11
- Plans covering
- 15
- Coverage rate
- 0.3%
- Tier range
- Tier 1 – Tier 4
- Average tier
- Tier 3, Preferred Brand
Restrictions
- Prior authorization required
- 0% of formularies
- Step therapy required
- 0% of formularies
- Quantity limits
- 0% of formularies
2023 Medicare Spending
- Beneficiaries
- 22
- Total spending
- $21,562
- Avg per beneficiary
- $980.11
Tier Distribution Across Plans
Medicare Advantage Plans (MA-PD) Covering cilastatin 500 MG / imipenem 500 MG Injection [Primaxin]
15 Medicare Advantage plans with Part D drug coverage include this drug.
| Plan | Insurer | Tier | PA | Premium | States |
|---|---|---|---|---|---|
| SeniorCare Complete (HMO D-SNP) | South Country Health Alliance | T1 | No | $0 | MN |
| AbilityCare (HMO D-SNP) | South Country Health Alliance | T1 | No | $0 | MN |
| Alameda Alliance Wellness (HMO D-SNP) | Alameda Alliance FOR Health | T1 | No | $0 | CA |
| Troy Medicare (HMO) | Troy Health, Inc. | T4 | No | $0 | NC |
| Troy Medicare for Dual-eligible Beneficiaries (HMO D-SNP) | Troy Health, Inc. | T4 | No | $0 | NC |
| Contra Costa Health Care Plus (HMO D-SNP) | Contra Costa County Medical Service DBA Contra Costa Health | T4 | No | $0 | CA |
| Keystone First VIP Choice (HMO D-SNP) | Vista Health Plan, Inc. | T4 | No | $0 | PA |
| AmeriHealth Caritas VIP Care (HMO D-SNP) | Vista Health Plan, Inc. | T4 | No | $0 | PA |
| First Choice VIP Care (HMO D-SNP) | Select Health OF South Carolina, Inc. | T4 | No | $0 | SC |
| AmeriHealth Caritas VIP Care (HMO D-SNP) | AmeriHealth Caritas VIP Next, Inc. | T4 | No | $0 | DE |
| AmeriHealth Caritas VIP Care Choice (HMO D-SNP) | AmeriHealth Caritas VIP Next, Inc. | T4 | No | $0 | DE |
| AmeriHealth Caritas VIP Care (HMO D-SNP) | Amerihealth Caritas Florida, Inc. | T4 | No | $0 | FL |
| AmeriHealth Caritas VIP Care (HMO D-SNP) | Amerihealth Caritas Louisiana, Inc. | T4 | No | $0 | LA |
| AmeriHealth Caritas VIP Care (HMO D-SNP) | Amerihealth Caritas North Carolina, Inc. | T4 | No | $0 | NC |
| AmeriHealth Caritas VIP Care (HMO D-SNP) | Amerihealth Michigan, Inc. | T4 | No | $0 | MI |
Frequently Asked Questions
Is cilastatin 500 MG / imipenem 500 MG Injection [Primaxin] covered by Medicare Part D?
Yes, cilastatin 500 MG / imipenem 500 MG Injection [Primaxin] is covered by 15 Medicare Part D plans (0.3% of all Part D formularies).
What tier is cilastatin 500 MG / imipenem 500 MG Injection [Primaxin] on Medicare Part D plans?
cilastatin 500 MG / imipenem 500 MG Injection [Primaxin] averages Tier 3.5 across Part D plans, ranging from Tier 1 to Tier 4.
Does cilastatin 500 MG / imipenem 500 MG Injection [Primaxin] require prior authorization?
0% of Part D formularies require prior authorization for cilastatin 500 MG / imipenem 500 MG Injection [Primaxin]. Step therapy: 0%. Quantity limits: 0%.
How much does Medicare spend on cilastatin 500 MG / imipenem 500 MG Injection [Primaxin]?
In 2023, total Medicare Part D spending on cilastatin 500 MG / imipenem 500 MG Injection [Primaxin] was $21,562, covering 22 beneficiaries. The average spend per beneficiary was $980.11.
Read our methodology - how this data is sourced, computed, and verified.
Nationwide similar Part D drugs
Data-derived peers across the CMS Part D formulary extract: nearest average tier placement and nearest prior-authorization rate. Not therapeutic alternatives or same-generic strengths.
Closest average formulary tier
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