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Dr. Frederick M. Dirbas, MD

General Surgery (Surgery Physician)

300 Pasteur Dr
Palo Alto, CA 94304

Who else practices at this address →

Santa Clara County includes mental health (13% of residents) shortage areas. About shortage areas

Call (650) 723-4000

  • Medicare participating

At a glance

Years since graduation
41
In the NPI registry since
2007
Medicare patients seen, 2024
49

Licensed in California since 1986, according to the Medical Board of California. We show license dates only for the states that publish them in bulk; see which states do. For other states, check the state medical board.

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

  • 1985Medical school: Columbia University College of Physicians and Surgeons
  • 2007Registered 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

  • Surgery Physician primary
    CA license G58935 (first issued 1986; current)

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

Map: General Surgery 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
49
Services billed
93
Patients’ average age
75
Most frequent Medicare services, 2023
ServiceTimesPatients
Established patient office or other outpatient visit, 10-19 minutes5252
Established patient office or other outpatient visit, 20-29 minutes2622
Partial removal of breast2523
Biopsy or removal of deep lymph nodes of underarm1717
Established patient office or other outpatient visit, 30-39 minutes1615
Imaging of lymph nodes during surgery1414

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 General Surgery clinicians in Palo Alto

Sources

NPI registry (CMS NPPES, November 2026; record last updated April 28, 2024), 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 1154457091. Official NPI registry record (opens in a new tab). Clinicians can correct their information in NPPES; changes appear here after our next monthly update.