Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Dr. Isaac O'Neal, MD

Individual provider Internal Medicine Physician · NPI 1598809626

Dr. Isaac O'Neal, MD is an Internal Medicine in Newark, New Jersey. Graduated from Rutgers New Jersey Medical School in 1980, 46 years ago. Practices with City of Newark, an 11-clinician group and accepts Medicare assignment. Licensed in New Jersey.

Years since qualifying
46
Trained at
Rutgers New Jersey Medical School
Licensed in
NJ
In the registry since
2007
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

110 William St
Newark, NJ 07102-1304
Phone: (973) 733-5300
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 25MA04217200 (NJ)

Record details

NPI number1598809626
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedFebruary 20, 2007
Last updated in NPPESMarch 18, 2013

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolRUTGERS NEW JERSEY MEDICAL SCHOOL
Graduated 1980 (46 years in practice)
Group practice City Of Newark — 11 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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