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Dr. John L. Farber

Pathology (Anatomic Pathology & Clinical Pathology Physician)

  • Medicare participating

At a glance

Years since graduation
60
In the NPI registry since
2006
Medicare patients seen, 2024
319

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

  • 1966Medical school: University of California, San Francisco School of Medicine
  • 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
    PA license MD013411E

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
319
Services billed
1,579
Patients’ average age
71
Most frequent Medicare services, 2023
ServiceTimesPatients
Pathology examination of tissue using a microscope, moderately high complexity410141
Special stained specimen slides to examine tissue including interpretation and report36297
Antibody evaluation, each additional single antibody stain procedure35575
Special stained specimen slides to examine tissue, each additional procedure26291
Special stained specimen slides to examine tissue, initial procedure200127
Pathology examination of tissue using a microscope, intermediate complexity194166
Pathology examination of tissue using a microscope, moderately low complexity10593
Antibody evaluation, initial single antibody stain procedure8375
Special stained specimen slides to examine tissue, each multiplex procedure6136
Pathology examination of tissue using a microscope, high complexity5251

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 Philadelphia

Sources

NPI registry (CMS NPPES, November 2026; record last updated October 24, 2014), 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 1174531719. Official NPI registry record (opens in a new tab). Clinicians can correct their information in NPPES; changes appear here after our next monthly update.