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Dr. Mark A. Antonacci, MD

Emergency Medicine (Emergency Medicine Physician)

  • Medicare participating

At a glance

Years since graduation
29
In the NPI registry since
2006
Medicare patients seen, 2024
22

Licensed in Texas since 2012, according to the Texas Medical Board. 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

  • 1997Medical school: Uniformed Services Uhs Fe Hebert School of Med
  • 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

  • Emergency Medicine Physician primary
    TX license P4138 (first issued 2012; active) · FL license ME82194

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

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
22
Services billed
428
Patients’ average age
69
Most frequent Medicare services, 2023
ServiceTimesPatients
New patient office or other outpatient visit, 30-44 minutes1717
Blood test, comprehensive group of blood chemicals1313
Insertion of needle into vein for collection of blood sample1212
Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count1212
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report1212

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 Emergency Medicine clinicians in Fort Sam Houston

Sources

NPI registry (CMS NPPES, November 2026; record last updated December 5, 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 1083673016. Official NPI registry record (opens in a new tab). Clinicians can correct their information in NPPES; changes appear here after our next monthly update.