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

Cy Stein, MD

Individual provider Medical Oncology Physician · NPI 1871673350

Cy Stein, MD is a Medical Oncology Physician in Duarte, California. Licensed in California and New York. Registered with an NPI since 2006.

Licensed in
CA, NY
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 checks out

1500 Duarte Rd City Of Hope - Medical Oncology Bldg 51
Duarte, CA 91010-3012
Phone: (626) 471-3890
Fax: (626) 471-7322
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 G89157 (CA)
Medical Oncology Physician Taxonomy 207RX0202X · Licence 157794 (NY)

Record details

NPI number1871673350
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedOctober 17, 2006
Last updated in NPPESNovember 13, 2020
Certification dateNovember 13, 2020
Mailing address28 S Oak Knoll Ave Unit 210, Pasadena, CA 91101

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