Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

John H Oneill Jr., DO

Individual provider Hospitalist Physician · NPI 1265445233

John H Oneill Jr., DO is an Internal Medicine in Newark, Delaware. Graduated from Des Moines University of Osteopathic Medicine and Health Sciences in 1986, 40 years ago. Practices with Christiana Care Health Services Inc, a 1,481-clinician group and accepts Medicare assignment. Licensed in Delaware.

Years since qualifying
40
Trained at
Des Moines University of Osteopathic Medicine and Health Sciences
Licensed in
DE
In the registry since
2006
Specialties on file
2
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

See every abbreviation used in this directory →

Practice location Address checks out

4755 Ogletown Stanton Rd Ste 5A43
Newark, DE 19718-5854
Phone: (302) 623-0188
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence C20003347 (DE)
Hospitalist Physician Taxonomy 208M00000X · Licence C2-0003347 (DE)

Record details

NPI number1265445233
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedAugust 14, 2006
Last updated in NPPESSeptember 24, 2018
Mailing address200 Hygeia Dr Ste 2300, Newark, DE 19713-2049

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolDES MOINES UNIVERSITY OF OSTEOPATHIC MEDICINE AND HEALTH SCIENCES
Graduated 1986 (40 years in practice)
Group practice Christiana Care Health Services Inc — 1481 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations5 on file with Medicare

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