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

Dr. Leonard A Farber, MD

Individual provider Radiation Oncology Physician · NPI 1639185838

Dr. Leonard A Farber, MD is a Radiation Oncology Physician in Fullerton, California. Practices as a sole proprietor and works from 3 locations. Licensed in California and New York.

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

2151 N Harbor Blvd Ste 1500
Fullerton, CA 92835-3823
Phone: (714) 446-5632
Show map & directions

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

Additional practice locations (2)

  • 21 West Broadway, New York, NY 10007 — (212) 300-0663
  • 21 West Broadway, New York, NY 10007 — (212) 300-0663

Specialties & licences

Radiation Oncology Physician (primary) Taxonomy 2085R0001X · Licence C153081 (CA)
Radiation Oncology Physician Taxonomy 2085R0001X · Licence 210306 (NY)

Record details

NPI number1639185838
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedJuly 31, 2006
Last updated in NPPESApril 10, 2018
Mailing addressPo Box 512185, Los Angeles, CA 90051-0185

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