What is James Clark's specialty?

James Clark (NPI 1588640650) is a Medicare-billing provider whose primary specialty is Gastroenterology in Downers Grove, IL.

Where does James Clark practice?

James Clark practices in Downers Grove, IL, based on the location reported in the CMS Medicare provider datasets for NPI 1588640650.

How much does Medicare pay James Clark?

James Clark (NPI 1588640650) received approximately $95K in total Medicare Part B payments, serving 399 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1588640650

James ClarkM.D.

GastroenterologyDowners Grove, ILI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

736

Unique beneficiaries

—

Total services

898

Distinct HCPCS

Medicare payment

$87K

Peer benchmark

Total Medicare services vs. 606 Gastroenterology providers in IL — above median (cohort median 726).

PRESCRIBING · PART D · 2024

Total Rx claims

750

Beneficiaries

—

Total drug cost

$308K

Distinct drugs

Brand share

34.3%

Top prescribed drugs

Pantoprazole Sodium299 claims

Omeprazole100 claims

Peg3350/Sod Sulf,bicarb,cl/Kcl75 claims

Mesalamine60 claims

Peg3350/Sod Sulf,bicarb,cl/Kcl44 claims

QUALITY · MIPS · 2024

No data available for this provider in 2024.

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2025

Total received

$1K

Payment records

By payment type

Food and Beverage$1K

Top paying entities

Food and Beverage$1K

REFERRAL NETWORK

Where James Clark'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). 29 inbound referrers · 0 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
SCHULTZ, KURT	59	194
Aheed Siddiqi Diagnostic Radiology · Downers Grove, IL	54	176
Liza Lopez Diagnostic Radiology · Downers Grove, IL	52	242
Rajeev Bhorade Diagnostic Radiology · Elmhurst, IL	50	267
Rockford Yapp Gastroenterology · Downers Grove, IL	46	178
ZHAO, YAN	36	155
Geoffrey Chun Diagnostic Radiology · Downers Grove, IL	34	174
William Wilkens Pathology · Park Ridge, IL	30	105
Superior Air-Ground Ambulance Service, Inc Ambulance Service Provider · Elmhurst, IL	24	66
Robert King Internal Medicine · Downers Grove, IL	23	228
Brian Harting Infectious Disease · Burr Ridge, IL	20	129
Thomas Carmody Emergency Medicine · Downers Grove, IL	20	54

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