Varies by plan

Does HMO Colorado, INC. require prior authorization for Dilantin?

Prior authorization for Dilantin differs across HMO Colorado, INC.'s Medicare Part D plans and product strengths — 3 of 4 Dilantin products in the corpus appear on their formularies, and the requirement is not uniform. Check the member's specific plan.

Some plans require authorization and others do not. The member's specific plan decides.

This drug does not appear on any of this payer's Medicare Part D formularies. That means it is NOT COVERED under those plans — which is a different and generally worse outcome than requiring prior authorization. An exception or formulary-exception request may still be possible.

By product strength

RxNorm product	Plans covering	Require prior auth	Status
phenytoin 25 MG/ML Oral Suspension [Dilantin]1313884	0 / 10	0	Not on formulary
phenytoin 50 MG Chewable Tablet [Dilantin]1313887	5 / 10	5	Prior authorization required
phenytoin sodium 100 MG Extended Release Oral Capsule [Dilantin]855673	10 / 10	10	Prior authorization required
phenytoin sodium 30 MG Extended Release Oral Capsule [Dilantin]855871	10 / 10	10	Prior authorization required

Product names come from RxNorm (U.S. National Library of Medicine).

Plan-by-plan detail — phenytoin sodium 100 MG Extended Release Oral Capsule [Dilantin]

Dilantin has 4 products in the corpus; this table is for phenytoin sodium 100 MG Extended Release Oral Capsule [Dilantin], the one carried on the most plans. The product table above covers every strength.

Plan	Contract	Tier	Prior auth	Step therapy	Qty limit
Anthem Dual Advantage (HMO D-SNP)	H4346-014	4	Yes	No	No
Anthem Full Dual Advantage (HMO D-SNP)	H4346-025	4	Yes	No	No
Anthem Full Dual Advantage 2 (HMO D-SNP)	H4346-031	4	Yes	No	No
Anthem I CareMore Chronic Care (HMO-POS C-SNP)	H4346-006	4	Yes	No	No
Anthem I CareMore Home Care (HMO I-SNP)	H4346-010	4	Yes	No	No
Anthem I CareMore Kidney Care (HMO-POS C-SNP)	H4346-030	4	Yes	No	No
Anthem I CareMore Lung Care (HMO-POS C-SNP)	H4346-005	4	Yes	No	No
Anthem I CareMore Medicare Advantage (HMO-POS)	H4346-001	4	Yes	No	No
Anthem Medicare Advantage (HMO-POS)	H4346-017	4	Yes	No	No
Anthem Medicare Advantage (HMO)	H4346-012	4	Yes	No	No

Source

Monthly Prescription Drug Plan Formulary and Pharmacy Network Information — Basic Drugs Formulary File

Effective: 2026-06-30
Retrieved: 2026-07-19
SHA-256: e626e6bcda1aa6a0071e6f0df6bafe686ae41842cdf0a9feffdc649b6d3ff3ae

We publish the hash of the exact file we ingested so any answer can be audited against the bytes CMS served that day.

Dilantin at other payers

Or see Dilantin across every payer at once.

Administrative information only. Benefily reports what a payer has published in its own prior-authorization policy as of the effective date shown. It is not medical advice, not a coverage or payment guarantee, and not an authorization. Requirements vary by plan, place of service and member benefits — always verify with the payer before rendering service.