What is Marcia Tonnesen's specialty?

Marcia Tonnesen (NPI 1205883238) is a Medicare-billing provider whose primary specialty is Dermatology in East Setauket, NY.

Where does Marcia Tonnesen practice?

Marcia Tonnesen practices in East Setauket, NY, based on the location reported in the CMS Medicare provider datasets for NPI 1205883238.

How much does Medicare pay Marcia Tonnesen?

Marcia Tonnesen (NPI 1205883238) received approximately $28K in total Medicare Part B payments, serving 33 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1205883238

Marcia TonnesenM.D.

PRACTICENORTH SHORE HEMATOLOGY ONCOLOGY ASSOCIATESSee all providers at this practice →

DermatologyEast Setauket, NYI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

Unique beneficiaries

—

Total services

244

Distinct HCPCS

Medicare payment

$27K

Peer benchmark

Total Medicare services vs. 960 Dermatology providers in NY — bottom quintile (cohort median 1,575).

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 Marcia Tonnesen'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). 1 inbound referrers · 3 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
Evan Jones Micrographic Dermatologic Surgery · Stony Brook, NY	12	81

Refers patients to

Outbound — where patients go next

Physician	Patients	Visits
Tara Kaufmann Dermatology · East Setauket, NY	16	800
Evan Jones Micrographic Dermatologic Surgery · Stony Brook, NY	12	86
CLARK, RICHARD	12	81

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