What is John Gilbert's specialty?

John Gilbert (NPI 1588650667) is a Medicare-billing provider whose primary specialty is Endocrinology in Fullerton, CA.

Where does John Gilbert practice?

John Gilbert practices in Fullerton, CA, based on the location reported in the CMS Medicare provider datasets for NPI 1588650667.

How much does Medicare pay John Gilbert?

John Gilbert (NPI 1588650667) received approximately $134K in total Medicare Part B payments, serving 620 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1588650667

John GilbertM.D.

EndocrinologyFullerton, CAI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

1,317

Unique beneficiaries

—

Total services

2,054

Distinct HCPCS

Medicare payment

$123K

Peer benchmark

Total Medicare services vs. 633 Endocrinology providers in CA — top quintile (cohort median 1,164).

PRESCRIBING · PART D · 2024

Total Rx claims

10,972

Beneficiaries

—

Total drug cost

$3.4M

Distinct drugs

102

Brand share

41.7%

Top prescribed drugs

Levothyroxine Sodium1,122 claims

Metformin Hcl581 claims

Semaglutide562 claims

Atorvastatin Calcium543 claims

Dapagliflozin Propanediol490 claims

QUALITY · MIPS · 2024

No data available for this provider in 2024.

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2025

Total received

$79K

Payment records

148

By payment type

Compensation for serving as faculty or as a speaker for a medical education program$32K

Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$26K

Travel and Lodging$9K

Consulting Fee$8K

Food and Beverage$4K

Top paying entities

Compensation for serving as faculty or as a speaker for a medical education program$32K

Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$26K

Travel and Lodging$9K

Consulting Fee$8K

Food and Beverage$4K

REFERRAL NETWORK

Where John Gilbert'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). 22 inbound referrers · 0 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
Victor Lee Pathology · Oceanside, CA	442	1,259
ST JUDE HOSPITAL INC	255	638
Unilab Corporation Clinical Laboratory · West Hills, CA	58	173
Hao Ngo Diagnostic Radiology · Fullerton, CA	35	64
Danh Nguyen Diagnostic Radiology · Riverside, CA	31	54
STAMBUK, EDGAR	31	63
UNGER, PHILLIP	28	40
Ramesh Rathod Interventional Cardiology · Fullerton, CA	25	53
Bradley Jackson Diagnostic Radiology · Fullerton, CA	25	47
Charles Suh Interventional Cardiology · Fullerton, CA	20	30
Eugene Byun Cardiology · Fullerton, CA	20	55
Samuel Maxwell Diagnostic Radiology · Fullerton, CA	19	37

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