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

Marianna Koczywas, MD

Individual provider Medical Oncology Physician · NPI 1639286677

Marianna Koczywas, MD is a Medical Oncology Physician in Duarte, California. Licensed in California. Registered with an NPI since 2006.

Licensed in
CA
In the registry since
2006
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 E Duarte Rd
Duarte, CA 91010
Phone: (626) 359-8111
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Medical Oncology Physician (primary) Taxonomy 207RX0202X · Licence A61724 (CA)

Record details

NPI number1639286677
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 24, 2006
Last updated in NPPESNovember 9, 2020
Certification dateNovember 9, 2020

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