PROVIDER PROFILE · NPI 1851560544

William MarekPH.D.

Psychologist, ClinicalSan Ramon, CAI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

349

Unique beneficiaries

—

Total services

2,042

Distinct HCPCS

Medicare payment

$148K

Peer benchmark

Total Medicare services vs. 1,573 Psychologist, Clinical providers in CA — top quintile (cohort median 410).

PRESCRIBING · PART D · 2024

No data available for this provider in 2024.

QUALITY · MIPS · 2024

No data available for this provider in 2024.

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2024

No data available for this provider in 2024.

REFERRAL NETWORK

Where William Marek's patients come from & go

Directional shared-patient flow from Medicare claims — who sends patients to this provider (inbound) and where this provider's patients go next (outbound). 10 inbound referrers · 0 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
Zeineldin Ahmad Podiatry · San Leandro, CA	39	239
Pranjalkumar Patel Family Practice · Tracy, CA	33	765
EVERGREEN AT TRACY, L.L.C.	28	287
American Medical Response West Ambulance Service Provider · Stockton, CA	24	190
Leehsin Fang Podiatry · Mountain View, CA	22	74
Community Mobile Diagnostics Llc Portable X-Ray Supplier · San Leandro, CA	18	160
Nidhi Gupta Diagnostic Radiology · Marquette, MI	15	90
Thomas Efird Diagnostic Radiology · Fremont, CA	14	60
Andy Su Emergency Medicine · Tracy, CA	12	59
Jinmei Woan Neurology · Tracy, CA	11	62

Refers patients to

Outbound — where patients go next

No outbound pairs above the suppression threshold.

Source: CMS Physician Shared Patient Patterns (30-day window, Medicare FFS). Direction = a beneficiary seen by the first provider, then the second, within 30 days; a proxy for referral, not a documented referral. Pairs with fewer than 11 shared beneficiaries are suppressed.

CROSS-REFERENCE

Related data on other Healthparse brands

ProviderScore

OIG/SAM exclusion screening, sanctions history