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Summary
Dr. John Oneill is a physician specializing in Internal Medicine and Emergency Medicine. He earned his medical degree from SUNY Downstate Medical Center College of Medicine and brings 24 years of experience to his practice. Dr. Oneill speaks English and provides comprehensive care across his dual specialties.
Dr. Oneill is affiliated with MedStar Georgetown University Hospital and Allegheny General Hospital, practicing in Washington, DC. He focuses on treating conditions such as tobacco use disorder, COVID-19, and abdominal pain. His procedural expertise includes emergency care, electrocardiogram testing, and therapeutic hypothermia for critically ill patients.
Dr. Oneill is affiliated with MedStar Georgetown University Hospital and Allegheny General Hospital, practicing in Washington, DC. He focuses on treating conditions such as tobacco use disorder, COVID-19, and abdominal pain. His procedural expertise includes emergency care, electrocardiogram testing, and therapeutic hypothermia for critically ill patients.
Overview based on verified provider data
Quick Facts
- 24 years of experience
- speaks English
- Suny Downstate Medical Center College Of Medicine
- 2 specialties
- 2 areas of expertise
- 2 board certifications
- 2 hospital affiliations
- 2 office locations
- Male
Office Locations
Dr. John Michael Oneill has 2 locationsCompare with Similar Doctors
 |  |  |  |
| Dr. John Michael Oneill, MD | Dr. Ana Paunovic, MD | Dr. David Clark, MD | Dr. Janelle Dennis, MD |
| Internal Medicine | Internal Medicine | Internal Medicine | Internal Medicine |
| Accepts New Patients | Accepts New Patients | Accepts New Patients | |
| 24 Years of Experience | 16 Years of Experience | ||
| No Virtual Visit Option | No Virtual Visit Option | No Virtual Visit Option | No Virtual Visit Option |
| Speaks English | Speaks Spanish, English | Speaks English | Speaks English |
| Washington , DC | Bethesda , MD | Greenbelt , MD | Crofton , MD |
| Med School: Suny Downstate Medical Center College Of Medicine | Med School: Louisiana State University School Of Medicine In New Orleans | Med School: Howard University College of Medicine | Med School: Meharry Medical College |
Current Profile | View Profile | View Profile | View Profile |
Insurance Plans Accepted by Dr. John Michael Oneill
Be sure to verify insurance information directly with your doctor's office, as it may undergo frequent changes.
Medical Specialties
Dr. John Michael Oneill has the following 2 specialties
Specialty Expertise
Dr. John Michael Oneill has the following 2 areas of expertise
Certifications, License, & Education
24 Years Experience
Dr. John Michael Oneill holds an expired medical license in the state of District Of Columbia.
Medical License
Medical Doctor with an expired medical license in the state of District Of Columbia that expired in 2026.
Education & Training
Medical School
Graduated from Suny Downstate Medical Center College Of Medicine in 2002.
NPI Number
Dr. Oneill's NPI number is 1215138730.
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Frequently Asked Questions
- What languages does Dr. John Oneill speak?
- Dr. John Oneill speaks English.
- How can I make an appointment with Dr. John Oneill?
- You can find contact information for Dr. John Oneill here on Vitals.
- Does Dr. John Oneill accept virtual/telehealth appointments?
- Dr. John Oneill has not indicated that they accept virtual/teleheatlh appointments. Contact their office through their Vitals profile to check for availability.
- Where is Dr. John Oneill's office located?
- Dr. John Oneill's office is located at 3800 Reservoir Rd Nw, Washington, DC, 20007.
- Which hospitals is Dr. John Oneill affiliated with?
- Dr. John Oneill is affiliated with Medstar Georgetown University Hospital and ALLEGHENY GENERAL HOSPITAL.
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