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Dr. Blake E. Gregory, M.D.

Internal Medicine (Internal Medicine Physician)

  • Medicare participating

At a glance

Years since graduation
16
In the NPI registry since
2010
Medicare patients seen, 2024
110

Licensed in California since 2011, 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. What an NPI is

Education and training

  • 2010Medical school: University of Texas Southwestern Medical School at Dallas
  • 2010Registered with an NPI (national billing number; not a license date)

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

  • Internal Medicine Physician primary
    CA license A119282 (first issued 2011; current)

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

Map: Internal Medicine 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
110
Services billed
355
Patients’ average age
66
Most frequent Medicare services, 2023
ServiceTimesPatients
Established patient office or other outpatient visit, 20-29 minutes9260
Established patient office or other outpatient visit, 30-39 minutes5336
Administration of influenza virus vaccine2929
Established patient office or other outpatient visit, 10-19 minutes2920
Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use2727
Admn sarscov2 vacc 1 dose2525
Influenza vaccine split virus, preservative free2525
Administration of pneumococcal vaccine2020
Telephone medical discussion with physician, 11-20 minutes1915
Telephone medical discussion with physician, 5-10 minutes1411

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.

Medicare prescriptions

Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.

Other Internal Medicine clinicians in Oakland

Sources

NPI registry (CMS NPPES, November 2026; record last updated August 15, 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 1881912129. Official NPI registry record (opens in a new tab). Clinicians can correct their information in NPPES; changes appear here after our next monthly update.