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Dr. John S. Oh, MD

Emergency Medicine (Emergency Medicine Physician)

  • Medicare participating

At a glance

Years since graduation
9
In the NPI registry since
2017
Medicare patients seen, 2024
174

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

  • 2017Medical school: University of Massachusetts Medical School
  • 2017Registered 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

  • Emergency Medicine Physician primary
    FL license ME161597 · MA license 285747

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

Map: Emergency 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
174
Services billed
198
Patients’ average age
75
Most frequent Medicare services, 2023
ServiceTimesPatients
Emergency department visit with high level of medical decision making283274
Emergency department visit with moderate level of medical decision making129124
Critical care, first 30-74 minutes7069
Electrocardiogram (ecg) 1 to 3 leads with review by physician only4747
Emergency department visit with low level of medical decision making1717
Critical care, each additional 30 minutes1111
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes1111

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 Emergency Medicine clinicians in Jacksonville

Sources

NPI registry (CMS NPPES, November 2026; record last updated April 11, 2026), 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 1841722360. Official NPI registry record (opens in a new tab). Clinicians can correct their information in NPPES; changes appear here after our next monthly update.