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

John S Sierocki, MD

Individual provider Medical Oncology Physician · NPI 1487792354

John S Sierocki, MD is a Medical Oncology in Princeton, New Jersey. Graduated from Hahnemann University College of Medicine in 1973, 53 years ago. Practices with Princeton Medical Group, PA, a 36-clinician group, accepts Medicare assignment and offers telehealth. Licensed in New Jersey.

Years since qualifying
53
Trained at
Hahnemann University College of Medicine
Licensed in
NJ
In the registry since
2007
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

419 N Harrison St Ste 101
Princeton, NJ 08540-3521
Phone: (609) 924-9300
Fax: (609) 430-9481
Show map & directions

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

Specialties & licences

Medical Oncology Physician (primary) Taxonomy 207RX0202X · Licence 25MA03428100 (NJ)

Record details

NPI number1487792354
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedFebruary 2, 2007
Last updated in NPPESMay 16, 2008
Mailing address419 N Harrison St, Princeton, NJ 08540-3521

Medicare enrollment

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

Medicare specialtyMEDICAL ONCOLOGY
Medical schoolHAHNEMANN UNIVERSITY COLLEGE OF MEDICINE
Graduated 1973 (53 years in practice)
Group practice Princeton Medical Group,P.A. — 36 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

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