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Dr. Patrick A. Twomey

Pathology (Anatomic Pathology & Clinical Pathology Physician)

400 E 3rd St
Duluth, MN 55805

Who else practices at this address →

St. Louis County includes primary care (17% of residents) and dental (35% of residents) shortage areas. About shortage areas

Call (218) 786-8364

  • Medicare participating

At a glance

Years since graduation
35
In the NPI registry since
2006
Medicare patients seen, 2024
896

The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. NPIs were first issued in May 2005 and became required on claims in 2007–2008, so an early date usually means the clinician was already in practice before then. What an NPI is

Education and training

  • 1991Medical school: University of Minnesota Medical School
  • 2006Registered with an NPI (national billing number; not a license date) — NPIs began in 2005, so practice likely started earlier

Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).

Specialties and state licenses

  • Anatomic Pathology & Clinical Pathology Physician primary
    MN license 40433

As reported to the NPI registry. To confirm a license is current, check the state medical board.

Map: Pathology per capita by county →

Where they work

Hospitals

Medical groups

Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.

Medicare patients and services

Medicare patients, 2024
896
Services billed
1,999
Patients’ average age
72
Most frequent Medicare services, 2023
ServiceTimesPatients
Pathology examination of tissue using a microscope, intermediate complexity732403
Protein measurement, serum237199
Special stained specimen slides to examine tissue, each additional procedure17847
Immunologic analysis technique on serum (immunofixation)121106
Special stained specimen slides to examine tissue, initial procedure7365
Cell examination of specimen, selective cellular enhancement technique6664
Pathology examination of tissue using a microscope, moderately high complexity6342
Evaluation of fine needle aspirate with interpretation and report3324
Pathology examination of tissue using a microscope, moderately low complexity3332
Protein measurement, body fluid3131

Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.

Other Pathology clinicians in Duluth

Sources

NPI registry (CMS NPPES, November 2026; record last updated May 19, 2011), Medicare Care Compare, Medicare Physician & Other Practitioners (2024), Medicare Part D Prescribers (2024) and Open Payments (2025). Information is self-reported or billed data and may be out of date; call before visiting.

NPI 1972537215. Official NPI registry record (opens in a new tab). Clinicians can correct their information in NPPES; changes appear here after our next monthly update.