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

Dr. Ivan Stephen Lowenthal, MD

Individual provider Medical Oncology Physician · NPI 1043245889

Dr. Ivan Stephen Lowenthal, MD is a Medical Oncology Physician in Tamuning, Guam. Practices as a sole proprietor and works from 3 locations. Licensed in Connecticut and Guam.

Licensed in
CT, GU
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address may be wrong

The ZIP code does not match the city and state on this record. Call before visiting.

633 Gov Carlos Camacho Rd Ste B5
Tamuning, GU 96913-3194
Phone: (671) 647-4656
Fax: (671) 647-4660

Additional practice locations (2)

  • 6 Devine St Ste 2c, North Haven, CT 06473-2222 — (203) 407-8002
  • 385 Huron Ave, Cambridge, MA 02138-6820 — (860) 307-3393

Specialties & licences

Medical Oncology Physician (primary) Taxonomy 207RX0202X · Licence M-1925 (GU)
Medical Oncology Physician Taxonomy 207RX0202X · Licence 18789 (CT)

Record details

NPI number1043245889
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedJuly 11, 2006
Last updated in NPPESMarch 19, 2025
Certification dateMarch 17, 2025
Mailing address633 Gov Carlos Camacho Rd., Ste B5, Tamuning, GU 96913-3194

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