What is William Marek's specialty?

William Marek (NPI 1851560544) is a Medicare-billing provider whose primary specialty is Psychologist, Clinical in San Ramon, CA.

Where does William Marek practice?

William Marek practices in San Ramon, CA, based on the location reported in the CMS Medicare provider datasets for NPI 1851560544.

How much does Medicare pay William Marek?

William Marek (NPI 1851560544) received approximately $148K in total Medicare Part B payments, serving 176 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

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

Healthparse Signals

Monitor this provider for changes — dated NPI change events