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

Eugene S Ahn, MD

Individual provider Radiation Oncology Physician · NPI 1912999533

Eugene S Ahn, MD is a Radiation Oncology in Simi Valley, California. Graduated from New York University School of Medicine in 1998, 28 years ago. Practices with Adventist Health Physicians Network, a 632-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in California.

Years since qualifying
28
Trained at
New York University School of Medicine
Licensed in
CA
In the registry since
2005
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

2985 Sycamore Dr
Simi Valley, CA 93065-1201
Phone: (805) 584-6611
Fax: (805) 584-0530
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 1240 Westlake Blvd, Westlake Village, CA 91361-1929 — (805) 494-4483

Specialties & licences

Radiation Oncology Physician (primary) Taxonomy 2085R0001X · Licence A71690 (CA)

Record details

NPI number1912999533
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 19, 2005
Last updated in NPPESAugust 5, 2022
Certification dateAugust 5, 2022
Mailing address2900 Loma Vista Rd Ste 100, Ventura, CA 93003-2909

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyRADIATION ONCOLOGY
Medical schoolNEW YORK UNIVERSITY SCHOOL OF MEDICINE
Graduated 1998 (28 years in practice)
Group practice Adventist Health Physicians Network — 632 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations4 on file with Medicare

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