What is Gregorio Guillen's specialty?

Gregorio Guillen (NPI 1538252226) is a Medicare-billing provider whose primary specialty is Internal Medicine in Perth Amboy, NJ.

Where does Gregorio Guillen practice?

Gregorio Guillen practices in Perth Amboy, NJ, based on the location reported in the CMS Medicare provider datasets for NPI 1538252226.

How much does Medicare pay Gregorio Guillen?

Gregorio Guillen (NPI 1538252226) received approximately $103K in total Medicare Part B payments, serving 202 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1538252226

Gregorio GuillenM.D

PRACTICEGREGORIO J. GUILLEN MD, PCSee all providers at this practice →

Internal MedicinePerth Amboy, NJI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

852

Unique beneficiaries

—

Total services

1,192

Distinct HCPCS

Medicare payment

$95K

Peer benchmark

Total Medicare services vs. 3,616 Internal Medicine providers in NJ — above median (cohort median 895).

PRESCRIBING · PART D · 2024

Total Rx claims

14,251

Beneficiaries

—

Total drug cost

$1.6M

Distinct drugs

173

Brand share

27.7%

Top prescribed drugs

Atorvastatin Calcium829 claims

Omeprazole516 claims

Amlodipine Besylate495 claims

Metoprolol Succinate364 claims

Gabapentin322 claims

QUALITY · MIPS · 2024

No data available for this provider in 2024.

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2024

Total received

$2K

Payment records

105

By payment type

Food and Beverage$2K

Education$8

Top paying entities

Food and Beverage$2K

Education$8

REFERRAL NETWORK

Where Gregorio Guillen'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). 57 inbound referrers · 0 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
Romel Arjona Internal Medicine · Palm Beach Gardens, FL	171	2,646
WARREN, STEPHEN	91	562
Karen Salmieri Diagnostic Radiology · East Brunswick, NJ	86	538
Elaine Mariolis Podiatry · Perth Amboy, NJ	71	190
RARITAN MANAGEMENT CORPORATION	69	180
Rakesh Passi Cardiology · East Brunswick, NJ	66	454
Sanjeev Nayyar Gastroenterology · Old Bridge, NJ	60	455
Cooperman Barnabas Medical Center Inc Medicare Diabetes Preventive Program · Livingston, NJ	51	429
Norman Sorkin Diagnostic Radiology · East Brunswick, NJ	48	243
GIRGIS, WAHID	45	176
Bikramjit Singh Nephrology · Carteret, NJ	42	380
Amy Vogia Diagnostic Radiology · Chester, PA	41	164

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