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

William W Chou, MD

Individual provider Radiation Oncology Physician · NPI 1790713253

William W Chou, MD is a Radiation Oncology in Mission Viejo, California. Graduated from Stanford University School of Medicine in 2001, 25 years ago. Practices with Mission Viejo Radiation Oncology Corp, a 2-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in California.

Years since qualifying
25
Trained at
Stanford University School of Medicine
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

27799 Medical Center Rd Ste 120
Mission Viejo, CA 92691-6400
Phone: (949) 573-9560
Fax: (949) 364-4276
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 27800 Medical Center Rd, Mission Viejo, CA 92691-6410 — (949) 364-9120

Specialties & licences

Radiation Oncology Physician (primary) Taxonomy 2085R0001X · Licence A94743 (CA)

Record details

NPI number1790713253
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 30, 2006
Last updated in NPPESNovember 9, 2020
Certification dateNovember 9, 2020

Medicare enrollment

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

Medicare specialtyRADIATION ONCOLOGY
Medical schoolSTANFORD UNIVERSITY SCHOOL OF MEDICINE
Graduated 2001 (25 years in practice)
Group practice Mission Viejo Radiation Oncology Corp — 2 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Other providers in Mission Viejo