Medicare Part D coverage · phenytoin · RxCUI 1313887
phenytoin 50 MG Chewable Tablet [Dilantin]
Per the CMS 2026 Part D formulary file, phenytoin 50 MG Chewable Tablet [Dilantin] is covered by 2,146 Medicare Part D plans (42.5% of enrollable products), averaging Tier 3.4, with prior authorization required on 4.4% of covering formularies.
- 42.5%
- Plan coverage
- 2,146
- Plans covering
- T3.4
- Avg tier
- 4.4%
- Prior auth required
What the CMS Formulary Data Shows for phenytoin 50 MG Chewable Tablet [Dilantin]
Per the CMS 2026 Part D formulary file, phenytoin 50 MG Chewable Tablet [Dilantin] (RxNorm concept RXCUI 1313887, generic name phenytoin) appears on 45 distinct formulary files spanning 2,146 Medicare Part D plan offerings - 42.5% 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 3.4.
Real-world access to phenytoin 50 MG Chewable Tablet [Dilantin] depends on utilization management as much as tier placement: 4.4% of covering formularies require prior authorization. 0% require step therapy. 4.4% apply quantity limits.
Historical spending context from the CMS Medicare Part D Drug Spending Dashboard shows 14,557 Part D beneficiaries filled phenytoin 50 MG Chewable Tablet [Dilantin] in 2023, with total plan-and-beneficiary spending of $4,008,684 and an average per-beneficiary annual cost of $275.38. The plan-by-plan detail below lists exactly which PDP and MA-PD contracts carry phenytoin 50 MG Chewable Tablet [Dilantin] today.
Coverage Details
- Formularies covering
- 45
- Plans covering
- 2,146
- Coverage rate
- 42.5%
- Tier range
- Tier 1 – Tier 4
- Average tier
- Tier 3, Preferred Brand
Restrictions
- Prior authorization required
- 4.4% of formularies
- Step therapy required
- 0% of formularies
- Quantity limits
- 4.4% of formularies
2023 Medicare Spending
- Beneficiaries
- 14,557
- Total spending
- $4,008,684
- Avg per beneficiary
- $275.38
Tier Distribution Across Plans
Medicare Advantage Plans (MA-PD) Covering phenytoin 50 MG Chewable Tablet [Dilantin]
100 Medicare Advantage plans with Part D drug coverage include this drug.
Show the next 30 plans
Showing top 50 of 100 plans.
Frequently Asked Questions
Is phenytoin 50 MG Chewable Tablet [Dilantin] covered by Medicare Part D?
Yes, phenytoin 50 MG Chewable Tablet [Dilantin] is covered by 2,146 Medicare Part D plans (42.5% of all Part D formularies).
What tier is phenytoin 50 MG Chewable Tablet [Dilantin] on Medicare Part D plans?
phenytoin 50 MG Chewable Tablet [Dilantin] averages Tier 3.4 across Part D plans, ranging from Tier 1 to Tier 4.
Does phenytoin 50 MG Chewable Tablet [Dilantin] require prior authorization?
4.4% of Part D formularies require prior authorization for phenytoin 50 MG Chewable Tablet [Dilantin]. Step therapy: 0%. Quantity limits: 4.4%.
How much does Medicare spend on phenytoin 50 MG Chewable Tablet [Dilantin]?
In 2023, total Medicare Part D spending on phenytoin 50 MG Chewable Tablet [Dilantin] was $4,008,684, covering 14,557 beneficiaries. The average spend per beneficiary was $275.38.
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
- colistin 75 MG/ML Injectable Solution T3.4
- 4 ML penicillin G benzathine 600000 UNT/ML Prefilled Syringe [Bicillin L-A] T3.4
- 2 ML penicillin G benzathine 600000 UNT/ML Prefilled Syringe [Bicillin L-A] T3.4
- 24 HR tacrolimus 0.5 MG Extended Release Oral Capsule [Astagraf] T3.4
- 2 ML penicillin G benzathine 300000 UNT/ML / penicillin G procaine 300000 UNT/ML Prefilled Syringe [Bicillin] T3.4
- 1 ML denosumab-nxxp 60 MG/ML Prefilled Syringe [Bildyos] T3.4
Similar prior-authorization rate
- tramadol hydrochloride 100 MG Oral Tablet 4.3% PA
- 12 HR clonidine hydrochloride 0.1 MG Extended Release Oral Tablet 4.3% PA
- estrogens, conjugated (USP) 0.3 MG Oral Tablet 4.3% PA
- 1000 ML potassium chloride 0.02 MEQ/ML / sodium chloride 9 MG/ML Injection 4.3% PA
- insulin lispro 100 UNT/ML Injectable Solution [Humalog] 4.3% PA
- 1000 ML glucose 50 MG/ML / potassium chloride 0.02 MEQ/ML Injection 4.6% PA