What is Mark Sarnak's specialty?

Mark Sarnak (NPI 1982641502) is a Medicare-billing provider whose primary specialty is Nephrology in Boston, MA.

Where does Mark Sarnak practice?

Mark Sarnak practices in Boston, MA, based on the location reported in the CMS Medicare provider datasets for NPI 1982641502.

How much does Medicare pay Mark Sarnak?

Mark Sarnak (NPI 1982641502) received approximately $34K in total Medicare Part B payments, serving 154 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1982641502

Mark SarnakM.D.

NephrologyBoston, MAI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

254

Unique beneficiaries

—

Total services

435

Distinct HCPCS

Medicare payment

$29K

Peer benchmark

Total Medicare services vs. 270 Nephrology providers in MA — below median (cohort median 904).

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 · 2025

Total received

$5K

Payment records

By payment type

Consulting Fee$5K

Education$3

Top paying entities

Consulting Fee$5K

Education$3

REFERRAL NETWORK

Where Mark Sarnak'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). 39 inbound referrers · 0 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
Shital Makim Diagnostic Radiology · Boston, MA	57	447
Eascare Llc Ambulance Service Provider · Weymouth, MA	52	590
Hoon Ji Diagnostic Radiology · New York, NY	48	214
Klemens Meyer Nephrology · Boston, MA	39	214
HOMER, MARC	38	160
Daniel Weiner Nephrology · Boston, MA	37	183
PERRONE, RONALD	35	585
Munther Homoud Clinical Cardiac Electrophysiology · Boston, MA	34	117
KATZ, JUDITH	31	149
Jonas Galper Cardiology · Boston, MA	29	110
Boston Public Health Commission Ambulance Service Provider · Boston, MA	29	90
Harprit Bedi Diagnostic Radiology · Boston, MA	27	95

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