Dual-Eligible (Original Medicare + Medi-Cal Secondary / CalAIM Medi-Medi)
For low-to-moderate income seniors with Parkinson's, keeping Original Medicare as primary with Medi-Cal as secondary is the strongest financial and clinical combination available: it combines UCSF/Stanford Medicare specialist access with $0 cost-sharing AND full access to Medi-Cal IHSS in-home caregiving.
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Eligibility & Enrollment Windows for Parkinson's Patients
Parkinson's patients who have Medicare (age 65+ or SSDI) AND qualify for full-scope Medi-Cal by income (with California's $0 asset limit).
How Dual-Eligible (Medicare + Medi-Cal) Performs Across the Parkinson's Care Pathway
When enrolled in Original Medicare (rather than a D-SNP HMO), Medicare is primary payer — allowing direct self-referral to Medicare-participating specialists at UCSF and Stanford.
Medicare approves DBS under NCD 160.24 without commercial prior auth, and Medi-Cal secondary crossover covers the Part A deductible and 20% Part B coinsurance ($0 patient bill at QMB/Medi-Cal participating providers).
Medicare covers LSVT BIG and LSVT LOUD under the KX modifier with $0 out-of-pocket coinsurance after Medi-Cal secondary crossover.
Medicare covers DaTscan under LCD L35396; Medi-Cal covers the 20% coinsurance.
Dual-eligible beneficiaries automatically receive Medicare Part D Extra Help (Low-Income Subsidy): $0 Part D premium, $0 deductible, and copays capped at ≤ $4.90 (generic) / ≤ $12.15 (brand).
Full access to California In-Home Supportive Services (IHSS), Adult Day Health Care (CBAS), and long-term nursing facility coverage.
- ✓Combines Original Medicare's academic specialist access with Medi-Cal's $0 out-of-pocket protection and IHSS home caregiving.
- ✓Protected by federal and California Qualified Medicare Beneficiary (QMB) balance-billing prohibitions — providers cannot bill dual-eligible patients for Medicare deductibles or 20% coinsurance.
- !If enrolled into an integrated Medi-Medi / D-SNP Medicare Advantage HMO instead of Original Medicare, the patient becomes subject to the HMO's closed specialist network and prior-auth rules.
Compare Other California Parkinson's Coverage Types
Source: CMS 2026 Dual-Eligible & Extra Help (LIS) Guide & CA DHCS CalAIM Dual Eligible Policy (Oct 2026)