IndividualActive
Marianna Koczywas, MD
NPI 1639286677 · Medical Oncology Physician · Duarte, CA
Marianna Koczywas, MD is a Medical Oncology Physician provider in Duarte, CA (NPI 1639286677).
Provider details
- NPI number
- 1639286677
- Entity type
- Individual
- Primary specialty
- Medical Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A61724 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(90/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
1500 E Duarte Rd
Duarte, CA 91010
Phone: (626) 359-8111
Street-level locationGet directions
Mailing address
Po Box 512185
Los Angeles, CA 90051-0185
Registry dates
- Enumerated
- 2006-08-24
- Last updated
- 2020-11-09
- Certified
- 2020-11-09
Frequently asked questions
- What is Marianna Koczywas's NPI number?
- Marianna Koczywas's National Provider Identifier (NPI) is 1639286677, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marianna Koczywas's specialty?
- Marianna Koczywas is listed in the NPPES registry with a primary specialty of Medical Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Marianna Koczywas located?
- Marianna Koczywas's practice location on file with NPPES is 1500 E Duarte Rd, Duarte, CA 91010.
- What is Marianna Koczywas's phone number?
- The practice phone number listed in the NPPES registry for Marianna Koczywas is (626) 359-8111.
- Is Marianna Koczywas's NPI active?
- Yes — Marianna Koczywas's NPI (1639286677) is active in the NPPES registry as of the last update on 2020-11-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.