What is Mark Weissig's specialty?

Mark Weissig (NPI 1649266032) is a Medicare-billing provider whose primary specialty is Pulmonary Disease in Fullerton, CA.

Where does Mark Weissig practice?

Mark Weissig practices in Fullerton, CA, based on the location reported in the CMS Medicare provider datasets for NPI 1649266032.

How much does Medicare pay Mark Weissig?

Mark Weissig (NPI 1649266032) received approximately $122K in total Medicare Part B payments, serving 529 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1649266032

Mark WeissigM.D.

PRACTICEST JUDE HOSPITAL YORBA LINDASee all providers at this practice →

Pulmonary DiseaseFullerton, CAI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

1,054

Unique beneficiaries

—

Total services

1,555

Distinct HCPCS

Medicare payment

$120K

Peer benchmark

Total Medicare services vs. 901 Pulmonary Disease providers in CA — above median (cohort median 927).

PRESCRIBING · PART D · 2024

Total Rx claims

4,764

Beneficiaries

—

Total drug cost

$1.7M

Distinct drugs

Brand share

47.9%

Top prescribed drugs

Fluticasone/Umeclidin/Vilanter439 claims

Albuterol Sulfate310 claims

Prednisone299 claims

Budesonide/Glycopyr/Formoterol268 claims

Montelukast Sodium262 claims

QUALITY · MIPS · 2024

No data available for this provider in 2024.

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2025

Total received

$424

Payment records

By payment type

Food and Beverage$424

Top paying entities

Food and Beverage$424

REFERRAL NETWORK

Where Mark Weissig'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). 36 inbound referrers · 0 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
Victor Lee Pathology · Oceanside, CA	360	1,862
ST JUDE HOSPITAL INC	350	1,901
Danh Nguyen Diagnostic Radiology · Riverside, CA	85	227
STAMBUK, EDGAR	57	153
Bradley Jackson Diagnostic Radiology · Fullerton, CA	48	99
Arman Forouzannia Diagnostic Radiology · Lynnwood, WA	46	106
Unilab Corporation Clinical Laboratory · West Hills, CA	46	165
Samuel Maxwell Diagnostic Radiology · Fullerton, CA	45	99
Hao Ngo Diagnostic Radiology · Fullerton, CA	45	106
Eugene Byun Cardiology · Fullerton, CA	39	125
UNGER, PHILLIP	38	86
Errajith Bertrand De Silva Critical Care (Intensivists) · Riverside, CA	28	107

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