What is Robert Greenfield's specialty?

Robert Greenfield (NPI 1649307000) is a Medicare-billing provider whose primary specialty is Internal Medicine in Fountain Valley, CA.

Where does Robert Greenfield practice?

Robert Greenfield practices in Fountain Valley, CA, based on the location reported in the CMS Medicare provider datasets for NPI 1649307000.

How much does Medicare pay Robert Greenfield?

Medicare Part B utilization, prescribing (Part D), MIPS quality scores, and industry payments for Robert Greenfield (NPI 1649307000) are detailed on this CareTrace profile.

PROVIDER PROFILE · NPI 1649307000

Robert Greenfield

Internal MedicineFountain Valley, CAI

MEDICARE UTILIZATION · PART B · 2024

No data available for this provider in 2024.

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

No data available for this provider in 2025.

REFERRAL NETWORK

Where Robert Greenfield'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
ORANGE COAST MEMORIAL MEDICAL CENTER	201	439
Unilab Corporation Clinical Laboratory · West Hills, CA	94	230
Richard Wasley Diagnostic Radiology · Laguna Beach, CA	49	91
Michael Wang Diagnostic Radiology · Anaheim, CA	49	93
SCHIFF, STEVEN	48	97
Elliott Fankuchen Diagnostic Radiology · Laguna Beach, CA	48	115
SZYMANOWSKI, JEREMY	39	79
SUTHERLAND, JAMES	37	72
Jennifer Wong Cardiology · Fountain Valley, CA	35	62
Viney Soni Pulmonary Disease · Fountain Valley, CA	31	59
NPI 1407869076	22	36
Arvind Nirula Cardiology · Fountain Valley, CA	21	42

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