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MARIANNA KOCZYWAS MD
NPI 1639286677
Internal Medicine - Medical Oncology in Duarte, CA

Active since August 24, 2006
1500 E DUARTE RD, DUARTE, CA 91010(626) 359-8111 Get Directions Write a Review

NPPES record last updated: November 9, 2020. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Nov 9, 2020, Dec 24, 2019, Mar 19, 2018 and 1 more (4 updates tracked since 2017).

About Marianna Koczywas Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MARIANNA KOCZYWAS MD (NPI 1639286677) is an individual medical oncology provider in Duarte, California, licensed in California (A61724) and active in the NPI registry since August 2006.

NPPES Registry Identity

NPI1639286677
Entity TypeIndividualFemale
Primary Taxonomy207RX0202X
Provider Legal NameMARIANNA KOCZYWASCredential: MD
Location Address1500 E DUARTE RDDuarte, CA 91010
Mailing AddressPo Box 512185Los Angeles, CA 90051-0185
Phone(626) 359-8111
Sole ProprietorNo
Enumeration DateAugust 24, 2006
Last NPPES UpdateNovember 9, 20204 updates tracked since enumeration
NPPES CertifiedNovember 9, 2020
✔ NPI 1639286677 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Medical OncologyAllopathic & Osteopathic Physicians
Taxonomy Code207RX0202X
License✔ Licensed in CA · A61724
Definition
An internist who specializes in the diagnosis and treatment of all types of cancer and other benign and malignant tumors. This specialist decides on and administers therapy for these malignancies as well as consults with surgeons and radiotherapists on other treatments for cancer.
1500 E DUARTE RD, Duarte, CA 91010
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Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MR. YUN YEN MD
Internal Medicine (Medical Oncology)
1500 E DUARTE RD
DUARTE, CA 91010
Los Angeles County (626) 359-8111
MR. YOUNG KIM MD
Pathology (Hematology)
1500 E DUARTE RD
DUARTE, CA 91010
Los Angeles County (626) 359-8111
MS. ANNA B PAWLOWSKA MD
Pediatrics (Pediatric Hematology-Oncology)
1500 E DUARTE RD
DUARTE, CA 91010
Los Angeles County (626) 359-8111
MS. ANDREA THORNTON PHD
Psychologist
1500 E DUARTE RD
DUARTE, CA 91010
Los Angeles County (626) 359-8111
DR. FINLY ZACHARIAH M.D.
Family Medicine (Hospice and Palliative Medicine)
1500 E DUARTE RD, DEPARTMENT OF SUPPORTIVE CARE
DUARTE, CA 91010
Los Angeles County (626) 256-4673
KIRSTEN PINA TALLMON PA-C
Physician Assistant
1500 E DUARTE RD
DUARTE, CA 91010
Los Angeles County (626) 741-7100
MS. SUNITA PATEL PHD
Psychologist (Clinical)
1500 E DUARTE RD
DUARTE, CA 91010
Los Angeles County (626) 359-8111
MS. CYNTHIA PARENTI MD
Anesthesiology
1500 E DUARTE RD
DUARTE, CA 91010
Los Angeles County (626) 359-8111

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Marianna Koczywas's NPI number?

The NPI number for Marianna Koczywas is 1639286677. It was assigned to this individual provider in the NPPES registry on August 24, 2006.

Where is Marianna Koczywas located?

Marianna Koczywas practices at 1500 E Duarte Rd, Duarte, CA 91010. The listed phone number is (626) 359-8111.

What is Marianna Koczywas's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Medical Oncology, with taxonomy code 207RX0202X.

When was this NPI record last updated?

The NPPES record for Marianna Koczywas was last updated on November 9, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.