phenytoin 50 MG Chewable Tablet [Dilantin]
phenytoin
RxCUI: 1313887
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 - 42.4% 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 $4,009,113 and an average per-beneficiary annual cost of $275.41. 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
- 42.4%
- 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
- $4,009,113
- Avg per beneficiary
- $275.41
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.
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 (42.4% 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 $4,009,113, covering 14,557 beneficiaries. The average spend per beneficiary was $275.41.
Read our methodology - how this data is sourced, computed, and verified.