Medicare Part D Prescription Drug Coverage (2026 $2,100 Cap & Smoothing)
In 2026, the federal $2,100 annual Part D out-of-pocket cap transforms affordability for Parkinson's patients prescribed expensive brand or specialty medications (Nuplazid, Vyalev, Gocovri, Rytary, Neupro, Xadago), provided the drug is on the plan's formulary or approved via a formulary exception.
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Eligibility & Enrollment Windows for Parkinson's Patients
Anyone with Medicare Part A and/or Part B (either via a standalone Part D Prescription Drug Plan [PDP] paired with Original Medicare, or bundled inside a Medicare Advantage MAPD plan).
How Medicare Part D (Drug Coverage) Performs Across the Parkinson's Care Pathway
Any Medicare-enrolled movement-disorder specialist can prescribe Part D medications, though prescriptions must be filled at an in-network preferred pharmacy or designated specialty pharmacy.
DBS surgery is covered under Medicare Part A/B, not Part D.
PT, OT, and Speech therapy are covered under Medicare Part B.
DaTscan is covered under Medicare Part B.
Caps total annual out-of-pocket spending on all formulary-covered Part D drugs at $2,100 in 2026, and lets patients opt into the Medicare Prescription Payment Plan to spread costs into $0-interest monthly bills.
Part D plans must contract with long-term-care pharmacies for residents in skilled nursing facilities, but do not pay for room, board, or caregiving.
- ✓Hard $2,100 annual out-of-pocket maximum in 2026 — once reached, all covered Part D drugs are $0 for the rest of the calendar year.
- ✓Medicare Prescription Payment Plan ('smoothing') prevents a $600–$2,100 single-fill pharmacy shock in January.
- !The $2,100 cap ONLY counts drugs that are on the plan's formulary (or approved via a formal Part D Formulary Exception + Prior Authorization).
- !Federal law prohibits Medicare Part D patients from using pharmaceutical manufacturer copay cards.
Compare Other California Parkinson's Coverage Types
Source: CMS CY 2026 Part D Benefit Parameters & Inflation Reduction Act Part D Redesign Guidance (Oct 2026)