Diagnostic Nuclear Medicine Imaging • Medical Necessity & Prior Authorization

DaTscan (Ioflupane I-123 SPECT) — Medical Necessity & Prior Authorization Checklist

Billing & Coverage Codes: CPT 78803 (Radiopharmaceutical Localization of Tumor/Distribution, SPECT Single Area) + HCPCS A9584 (Iodine I-123 Ioflupane, Diagnostic, per study dose)

Important Policy Notice — Not a Guarantee of Approval: Clinical coverage criteria change periodically and your health plan's official Evidence of Coverage and clinical policy determination are final. This checklist summarizes published CMS and commercial payer policies for educational preparation and is never a guarantee of approval.

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Plain-English Clinical Documentation Checklist

What Your Neurologist / Care Team Must Document in the Chart Note

Insurers approve DaTscan ONLY when a clinical exam alone cannot distinguish presynaptic Parkinsonian syndrome from non-degenerative tremor (such as Essential Tremor or drug-induced parkinsonism). Routine ordering to 'confirm' classic Parkinson's is the #1 reason DaTscan claims are denied. Document these 4 items:

1Ordered by (or in consultation with) a board-certified neurologist or movement-disorder specialist.

2Documented diagnostic uncertainty after a comprehensive neurological examination — specifically distinguishing idiopathic Parkinson's disease (or MSA/PSP) from Essential Tremor, psychogenic tremor, or drug-induced parkinsonism (e.g., from dopamine-blocking antipsychotics or antiemetics).

3Clear statement in the chart note of how the DaTscan result will directly change clinical management (e.g., initiating dopaminergic therapy vs. beta-blocker/primidone or discontinuing a suspected offending medication).

4Confirmation that the scan is NOT being ordered to monitor disease progression in an already-established Parkinson's diagnosis or to differentiate Parkinson's disease from MSA or PSP (which all show abnormal DaTscans).

Published Clinical Policy Citations

CMS Medicare & Major Commercial Payer Policies

Medicare (Noridian Jurisdiction E — California MAC)Verified Oct 2026

CMS Billing and Coding Article A56853 / Local Coverage Determination (LCD) Nuclear Medicine Guidelines (CPT 78803 + HCPCS A9584)

Covered for striatal dopamine transporter visualization in adult patients with suspected Parkinsonian syndromes (ICD-10 G20, G21.x, G25.0) to differentiate essential tremor from tremor due to presynaptic parkinsonian syndromes.

View Official Source Policy (https://www.cms.gov/medicare-coverage-database/)

Anthem Blue Cross / Carelon Medical Benefits ManagementVerified Oct 2026

Anthem RAD.00059 / Carelon Advanced Imaging Guidelines — Dopamine Transporter Imaging (DaTscan)

Medically necessary when clinical examination is inconclusive between Parkinsonian syndrome and Essential Tremor or drug-induced parkinsonism, and results will guide pharmacotherapy.

View Official Source Policy (https://www.anthem.com/ca/provider/policies/clinical-guidelines/)

AetnaVerified Oct 2026

Aetna Clinical Policy Bulletin (CPB) 0845 — Ioflupane I-123 (DaTscan)

Covers DaTscan to differentiate essential tremor from tremor due to idiopathic PD, MSA, or PSP; considers repeat DaTscans for monitoring disease progression not medically necessary.

View Official Source Policy (https://www.aetna.com/health-care-professionals/clinical-policy-bulletins/medical-clinical-policy-bulletins.html)

UnitedHealthcare / EviCoreVerified Oct 2026

UHC / EviCore Nuclear Medicine & Advanced Imaging Guidelines (CPT 78803)

Requires specialist evaluation documenting equivocal clinical features between Parkinsonian syndrome and non-parkinsonian tremor.

View Official Source Policy (https://www.uhcprovider.com/en/prior-auth-advance-notification/radiology-prior-authorization.html)

CignaVerified Oct 2026

Cigna Coverage Policy 0508 — Dopamine Transporter Single Photon Emission Computed Tomography (DaT-SPECT)

Covered for diagnostic differentiation of uncertain Parkinsonian tremor vs. Essential Tremor.

View Official Source Policy (https://static.cigna.com/assets/chcp/resourceLibrary/coveragePolicies/)

Other Parkinson's Medical Necessity Checklists

DBS Surgery (CPT 61885 / 61867)PT / OT / Speech & LSVT (CPT 97110, 97535, 92507)Home Health Care (CPT 99349 / G0151 / G0153)Duopa (J7340) & Vyalev Infusion Pumps Brand Parkinson's Drugs Prior Auth